update to gradle 8.7, update dependencies, reduce test logging, add libtest

.gitignore

@@ -2,7 +2,6 @@
 /.classpath
 /.project
 /.gradle
-**/data
 **/work
 **/logs
 **/.idea
@@ -12,5 +11,3 @@
 .DS_Store
 *.iml
 *~
-*.key
-*.crt

NOTICE.txt

@@ -25,6 +25,7 @@ The following changes were performed on the original source code:
 - removed all macos related code (including kqueue)
 - removed all aarch64 related code
 - removed the direct brotli4j dependency by rewriting Brotli4jOptions to not use Encoder.Parameters
+- removed deprecated channel-udt (transport-udt)
 
 Challenges for Netty build on JDK 21
 
@@ -41,12 +42,12 @@ Subproject organization
 Original netty subproject names are not related to package names. I reorganized the names to allow better assignment
 between subproject name, package name, artifact names, and java module. The following reorgnizations were performed:
 
-netty/all -> [todo]
+netty/all ->
-netty/bom -> [todo]
+netty/bom ->
 netty/buffer -> netty-buffer
 netty/codec -> netty-handler-codec, netty-handler-codec-compression, netty-handler-codec-protobuf
-netty/codec-dns -> [todo]
+netty/codec-dns -> netty-handler-codec-dns
-netty/codec-haproxy -> [todo]
+netty/codec-haproxy ->
 netty/codec-http -> netty-handler-codec-http, netty-handler-codec-rtsp, netty-handler-codec-spdy
 netty/codec-http2 ->
 netty/codec-memcache ->
@@ -61,7 +62,7 @@ netty/handler -> netty-handler
 netty/handler-proxy
 netty/handler-ssl-ocsp
 netty/resolver -> netty-resolver
-netty/resolver-dns ->
+netty/resolver-dns -> netty-resolver-dns
 netty/resolver-dns-classes-macos -> [dropped]
 netty/resolver-dns-native-macos -> [dropped]
 netty/transport -> netty-channel

build.gradle

@@ -11,8 +11,6 @@ wrapper {
     distributionType = Wrapper.DistributionType.BIN
 }
 
-apply plugin: 'com.google.osdetector'
-
 ext {
     user = 'joerg'
     name = 'netty'
@@ -30,11 +28,15 @@ ext {
     organizationUrl = 'https://xbib.org'
 }
 
+apply plugin: 'com.google.osdetector'
+
 subprojects {
+    if (!it.name.endsWith('-native') && it.name != 'test-results') {
         apply from: rootProject.file('gradle/repositories/maven.gradle')
         apply from: rootProject.file('gradle/compile/java.gradle')
         apply from: rootProject.file('gradle/test/junit5.gradle')
         apply from: rootProject.file('gradle/publish/maven.gradle')
     }
+}
 apply from: rootProject.file('gradle/publish/sonatype.gradle')
 apply from: rootProject.file('gradle/publish/forgejo.gradle')

gradle.properties

@@ -1,3 +1,3 @@
 group = org.xbib.netty
 name = netty
-version = 4.1.104
+version = 4.1.107.0

gradle/compile/c.gradle

@@ -0,0 +1,3 @@
+
+apply plugin: 'base'
+apply plugin: 'org.xbib.gradle.plugin.c'

gradle/compile/cmake.gradle

@@ -0,0 +1 @@
+apply plugin: 'org.xbib.gradle.plugin.cmake'

gradle/test/junit5.gradle

@@ -10,11 +10,8 @@ dependencies {
 
 test {
     useJUnitPlatform()
-    failFast = true
+    failFast = false
-    testLogging {
+    ignoreFailures = true
-        events 'STARTED', 'PASSED', 'FAILED', 'SKIPPED'
-        showStandardStreams = true
-    }
     minHeapSize = "1g" // initial heap size
     maxHeapSize = "2g" // maximum heap size
     jvmArgs '--add-exports=java.base/jdk.internal=ALL-UNNAMED',
@@ -30,11 +27,10 @@ test {
             '--add-opens=jdk.unsupported/sun.misc=ALL-UNNAMED',
             '-Dio.netty.bootstrap.extensions=serviceload'
     systemProperty 'java.util.logging.config.file', 'src/test/resources/logging.properties'
-    // we have remove native images, this is no longer used
+    testLogging {
-    systemProperty "nativeImage.handlerMetadataGroupId", "io.netty"
+        events 'STARTED', 'PASSED', 'FAILED', 'SKIPPED'
-    // we have remove native images
+        showStandardStreams = true
-    // we have remove native images, this is no longer used
+    }
-    systemProperty "nativeimage.handlerMetadataArtifactId", "netty-transport"
     afterSuite { desc, result ->
         if (!desc.parent) {
             println "\nTest result: ${result.resultType}"

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

gradlew.bat

@@ -43,11 +43,11 @@ set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
 if %ERRORLEVEL% equ 0 goto execute
 
-echo.
+echo. 1>&2
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
-echo.
+echo. 1>&2
-echo Please set the JAVA_HOME variable in your environment to match the
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
-echo location of your Java installation.
+echo location of your Java installation. 1>&2
 
 goto fail
 
@@ -57,11 +57,11 @@ set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
 if exist "%JAVA_EXE%" goto execute
 
-echo.
+echo. 1>&2
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
-echo.
+echo. 1>&2
-echo Please set the JAVA_HOME variable in your environment to match the
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
-echo location of your Java installation.
+echo location of your Java installation. 1>&2
 
 goto fail
 

netty-buffer/src/test/resources/logging.properties

@@ -1,7 +1,7 @@
 handlers=java.util.logging.ConsoleHandler
-.level=ALL
+.level=INFO
 java.util.logging.SimpleFormatter.format=%1$tY-%1$tm-%1$td %1$tH:%1$tM:%1$tS.%1$tL %4$-7s [%3$s] %5$s %6$s%n
-java.util.logging.ConsoleHandler.level=ALL
+java.util.logging.ConsoleHandler.level=INFO
 java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter
 jdk.event.security.level=INFO
 org.junit.jupiter.engine.execution.ConditionEvaluator.level=OFF

netty-channel-epoll-native/build.gradle

@@ -0,0 +1,82 @@
+
+/* currently we do not build our C code natively, but we provide copies of the binaries in META-INF/native */
+
+apply plugin: 'base'
+
+task nettyEpollLinuxX8664(type: Jar) {
+    destinationDirectory.set(project.layout.buildDirectory.dir('libs'))
+    archiveBaseName.set(project.name + '-' + project.version)
+    archiveExtension.set('jar')
+    archiveClassifier.set('linux-x86_64')
+    version rootProject.version
+    from (project.layout.projectDirectory.dir('src/main/resources')) {
+        include 'META-INF/native/libnetty_transport_native_epoll_x86_64.so'
+    }
+}
+assemble.dependsOn(nettyEpollLinuxX8664)
+
+configurations {
+    'linux-x86_64' {
+        canBeConsumed = true
+        canBeResolved = false
+        /*attributes {
+            attribute(Category.CATEGORY_ATTRIBUTE, objects.named(Category, Category.LIBRARY))
+            attribute(Usage.USAGE_ATTRIBUTE, objects.named(Usage, Usage.JAVA_RUNTIME))
+            attribute(Bundling.BUNDLING_ATTRIBUTE, objects.named(Bundling, Bundling.EXTERNAL))
+            attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, JavaVersion.current().majorVersion.toInteger())
+            attribute(LibraryElements.LIBRARY_ELEMENTS_ATTRIBUTE, objects.named(LibraryElements, 'linux-x86_64'))
+        }*/
+    }
+}
+
+artifacts {
+    'linux-x86_64'(nettyEpollLinuxX8664)
+}
+
+publishing {
+    publications {
+        publishNettyEpollLinuxX8664(MavenPublication) {
+            groupId rootProject.group
+            artifactId project.name
+            version rootProject.version
+            artifact nettyEpollLinuxX8664
+            pom {
+                artifactId = project.name
+                name = project.name
+                version = project.version
+                description = rootProject.ext.description
+                url = rootProject.ext.url
+                inceptionYear = rootProject.ext.inceptionYear
+                packaging = 'jar'
+                organization {
+                    name = rootProject.ext.organizationName
+                    url = rootProject.ext.organizationUrl
+                }
+                developers {
+                    developer {
+                        id = 'jprante'
+                        name = 'Jörg Prante'
+                        email = 'joergprante@gmail.com'
+                        url = 'https://xbib.org/joerg'
+                    }
+                }
+                scm {
+                    url = rootProject.ext.scmUrl
+                    connection = rootProject.ext.scmConnection
+                    developerConnection = rootProject.ext.scmDeveloperConnection
+                }
+                issueManagement {
+                    system = rootProject.ext.issueManagementSystem
+                    url = rootProject.ext.issueManagementUrl
+                }
+                licenses {
+                    license {
+                        name = rootProject.ext.licenseName
+                        url = rootProject.ext.licenseUrl
+                        distribution = 'repo'
+                    }
+                }
+            }
+        }
+    }
+}

netty-channel-epoll-native/src/main/c/netty_epoll_linuxsocket.c

@@ -0,0 +1,909 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+/*
+ * Since glibc 2.8, the _GNU_SOURCE feature test macro must be defined
+ * (before including any header files) in order to obtain the
+ * definition of the ucred structure. See <a href=https://linux.die.net/man/7/unix>
+ */
+#define _GNU_SOURCE
+
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <netinet/in.h>
+#include <netinet/udp.h> // SOL_UDP
+#include <sys/sendfile.h>
+#include <linux/tcp.h> // TCP_NOTSENT_LOWAT is a linux specific define
+#include "netty_epoll_linuxsocket.h"
+#include "netty_epoll_vmsocket.h"
+#include "netty_unix_errors.h"
+#include "netty_unix_filedescriptor.h"
+#include "netty_unix_jni.h"
+#include "netty_unix_socket.h"
+#include "netty_unix_util.h"
+
+#define LINUXSOCKET_CLASSNAME "io/netty/channel/epoll/LinuxSocket"
+
+// TCP_FASTOPEN is defined in linux 3.7. We define this here so older kernels can compile.
+#ifndef TCP_FASTOPEN
+#define TCP_FASTOPEN 23
+#endif
+
+// TCP_FASTOPEN_CONNECT is defined in linux 4.11. We define this here so older kernels can compile.
+#ifndef TCP_FASTOPEN_CONNECT
+#define TCP_FASTOPEN_CONNECT 30
+#endif
+
+// TCP_NOTSENT_LOWAT is defined in linux 3.12. We define this here so older kernels can compile.
+#ifndef TCP_NOTSENT_LOWAT
+#define TCP_NOTSENT_LOWAT 25
+#endif
+
+// SO_BUSY_POLL is defined in linux 3.11. We define this here so older kernels can compile.
+#ifndef SO_BUSY_POLL
+#define SO_BUSY_POLL 46
+#endif
+
+// UDP_GRO is defined in linux 5. We define this here so older kernels can compile.
+#ifndef UDP_GRO
+#define UDP_GRO 104
+#endif
+
+static jweak peerCredentialsClassWeak = NULL;
+static jmethodID peerCredentialsMethodId = NULL;
+
+static jfieldID fileChannelFieldId = NULL;
+static jfieldID transferredFieldId = NULL;
+static jfieldID fdFieldId = NULL;
+static jfieldID fileDescriptorFieldId = NULL;
+
+// JNI Registered Methods Begin
+static jint netty_epoll_linuxsocket_newVSockStreamFd(JNIEnv* env, jclass clazz) {
+    int fd = netty_unix_socket_nonBlockingSocket(AF_VSOCK, SOCK_STREAM, 0);
+    if (fd == -1) {
+        return -errno;
+    }
+    return fd;
+}
+
+static jint netty_epoll_linuxsocket_bindVSock(JNIEnv* env, jclass clazz, jint fd, jint cid, jint port) {
+    struct sockaddr_vm addr;
+    memset(&addr, 0, sizeof(struct sockaddr_vm));
+
+    addr.svm_family = AF_VSOCK;
+    addr.svm_port = port;
+    addr.svm_cid = cid;
+
+    int res = bind(fd, (struct sockaddr*) &addr, sizeof(struct sockaddr_vm));
+
+    if (res == -1) {
+        return -errno;
+    }
+    return res;
+}
+
+static jint netty_epoll_linuxsocket_connectVSock(JNIEnv* env, jclass clazz, jint fd, jint cid, jint port) {
+    struct sockaddr_vm addr;
+    memset(&addr, 0, sizeof(struct sockaddr_vm));
+    addr.svm_family = AF_VSOCK;
+    addr.svm_port = port;
+    addr.svm_cid = cid;
+
+    int res;
+    int err;
+    do {
+        res = connect(fd, (struct sockaddr*) &addr, sizeof(struct sockaddr_vm));
+    } while (res == -1 && ((err = errno) == EINTR));
+
+    if (res == -1) {
+        return -errno;
+    }
+    return res;
+}
+
+static jbyteArray createVSockAddressArray(JNIEnv* env, const struct sockaddr_vm* addr) {
+    jbyteArray bArray = (*env)->NewByteArray(env, 8);
+    if (bArray == NULL) {
+        return NULL;
+    }
+
+    unsigned int cid = (addr->svm_cid);
+    unsigned int port = (addr->svm_port);
+
+    unsigned char a[4];
+    a[0] = cid >> 24;
+    a[1] = cid >> 16;
+    a[2] = cid >> 8;
+    a[3] = cid;
+    (*env)->SetByteArrayRegion(env, bArray, 0, 4, (jbyte*) &a);
+
+    a[0] = port >> 24;
+    a[1] = port >> 16;
+    a[2] = port >> 8;
+    a[3] = port;
+    (*env)->SetByteArrayRegion(env, bArray, 4, 4, (jbyte*) &a);
+    return bArray;
+}
+
+static jbyteArray netty_epoll_linuxsocket_remoteVSockAddress(JNIEnv* env, jclass clazz, jint fd) {
+    struct sockaddr_vm addr = { 0 };
+    socklen_t len = sizeof(addr);
+    if (getpeername(fd, (struct sockaddr*) &addr, &len) == -1) {
+        return NULL;
+    }
+    return createVSockAddressArray(env, &addr);
+}
+
+static jbyteArray netty_epoll_linuxsocket_localVSockAddress(JNIEnv* env, jclass clazz, jint fd) {
+    struct sockaddr_vm addr = { 0 };
+    socklen_t len = sizeof(addr);
+    if (getsockname(fd, (struct sockaddr*) &addr, &len) == -1) {
+        return NULL;
+    }
+    return createVSockAddressArray(env, &addr);
+}
+
+static void netty_epoll_linuxsocket_setTimeToLive(JNIEnv* env, jclass clazz, jint fd, jint optval) {
+    netty_unix_socket_setOption(env, fd, IPPROTO_IP, IP_TTL, &optval, sizeof(optval));
+}
+
+static void netty_epoll_linuxsocket_setIpMulticastLoop(JNIEnv* env, jclass clazz, jint fd, jboolean ipv6, jint optval) {
+    if (ipv6 == JNI_TRUE) {
+        u_int val = (u_int) optval;
+        netty_unix_socket_setOption(env, fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &val, sizeof(val));
+    } else {
+        u_char val = (u_char) optval;
+        netty_unix_socket_setOption(env, fd, IPPROTO_IP, IP_MULTICAST_LOOP, &val, sizeof(val));
+    }
+}
+
+static void netty_epoll_linuxsocket_setInterface(JNIEnv* env, jclass clazz, jint fd, jboolean ipv6, jbyteArray interfaceAddress, jint scopeId, jint interfaceIndex) {
+    struct sockaddr_storage interfaceAddr;
+    socklen_t interfaceAddrSize;
+    struct sockaddr_in* interfaceIpAddr;
+
+    memset(&interfaceAddr, 0, sizeof(interfaceAddr));
+
+    if (ipv6 == JNI_TRUE) {
+        if (interfaceIndex == -1) {
+           netty_unix_errors_throwIOException(env, "Unable to find network index");
+           return;
+        }
+        netty_unix_socket_setOption(env, fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &interfaceIndex, sizeof(interfaceIndex));
+    } else {
+        if (netty_unix_socket_initSockaddr(env, ipv6, interfaceAddress, scopeId, 0, &interfaceAddr, &interfaceAddrSize) == -1) {
+            netty_unix_errors_throwIOException(env, "Could not init sockaddr");
+            return;
+        }
+
+        interfaceIpAddr = (struct sockaddr_in*) &interfaceAddr;
+        netty_unix_socket_setOption(env, fd, IPPROTO_IP, IP_MULTICAST_IF, &interfaceIpAddr->sin_addr, sizeof(interfaceIpAddr->sin_addr));
+    }
+}
+
+static void netty_epoll_linuxsocket_setTcpCork(JNIEnv* env, jclass clazz, jint fd, jint optval) {
+    netty_unix_socket_setOption(env, fd, IPPROTO_TCP, TCP_CORK, &optval, sizeof(optval));
+}
+
+static void netty_epoll_linuxsocket_setTcpQuickAck(JNIEnv* env, jclass clazz, jint fd, jint optval) {
+    netty_unix_socket_setOption(env, fd, IPPROTO_TCP, TCP_QUICKACK, &optval, sizeof(optval));
+}
+
+static void netty_epoll_linuxsocket_setTcpDeferAccept(JNIEnv* env, jclass clazz, jint fd, jint optval) {
+    netty_unix_socket_setOption(env, fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &optval, sizeof(optval));
+}
+
+static void netty_epoll_linuxsocket_setTcpNotSentLowAt(JNIEnv* env, jclass clazz, jint fd, jint optval) {
+    netty_unix_socket_setOption(env, fd, IPPROTO_TCP, TCP_NOTSENT_LOWAT, &optval, sizeof(optval));
+}
+
+static void netty_epoll_linuxsocket_setTcpFastOpen(JNIEnv* env, jclass clazz, jint fd, jint optval) {
+    netty_unix_socket_setOption(env, fd, IPPROTO_TCP, TCP_FASTOPEN, &optval, sizeof(optval));
+}
+
+static void netty_epoll_linuxsocket_setTcpKeepIdle(JNIEnv* env, jclass clazz, jint fd, jint optval) {
+    netty_unix_socket_setOption(env, fd, IPPROTO_TCP, TCP_KEEPIDLE, &optval, sizeof(optval));
+}
+
+static void netty_epoll_linuxsocket_setTcpKeepIntvl(JNIEnv* env, jclass clazz, jint fd, jint optval) {
+    netty_unix_socket_setOption(env, fd, IPPROTO_TCP, TCP_KEEPINTVL, &optval, sizeof(optval));
+}
+
+static void netty_epoll_linuxsocket_setTcpKeepCnt(JNIEnv* env, jclass clazz, jint fd, jint optval) {
+    netty_unix_socket_setOption(env, fd, IPPROTO_TCP, TCP_KEEPCNT, &optval, sizeof(optval));
+}
+
+static void netty_epoll_linuxsocket_setTcpUserTimeout(JNIEnv* env, jclass clazz, jint fd, jint optval) {
+    netty_unix_socket_setOption(env, fd, IPPROTO_TCP, TCP_USER_TIMEOUT, &optval, sizeof(optval));
+}
+
+static void netty_epoll_linuxsocket_setIpFreeBind(JNIEnv* env, jclass clazz, jint fd, jint optval) {
+    netty_unix_socket_setOption(env, fd, IPPROTO_IP, IP_FREEBIND, &optval, sizeof(optval));
+}
+
+static void netty_epoll_linuxsocket_setIpTransparent(JNIEnv* env, jclass clazz, jint fd, jint optval) {
+    netty_unix_socket_setOption(env, fd, SOL_IP, IP_TRANSPARENT, &optval, sizeof(optval));
+}
+
+static void netty_epoll_linuxsocket_setIpRecvOrigDestAddr(JNIEnv* env, jclass clazz, jint fd, jint optval) {
+    netty_unix_socket_setOption(env, fd, IPPROTO_IP, IP_RECVORIGDSTADDR, &optval, sizeof(optval));
+}
+
+static void netty_epoll_linuxsocket_setSoBusyPoll(JNIEnv* env, jclass clazz, jint fd, jint optval) {
+    netty_unix_socket_setOption(env, fd, SOL_SOCKET, SO_BUSY_POLL, &optval, sizeof(optval));
+}
+
+static void netty_epoll_linuxsocket_joinGroup(JNIEnv* env, jclass clazz, jint fd, jboolean ipv6, jbyteArray groupAddress, jbyteArray interfaceAddress, jint scopeId, jint interfaceIndex) {
+    struct sockaddr_storage groupAddr;
+    socklen_t groupAddrSize;
+    struct sockaddr_storage interfaceAddr;
+    socklen_t interfaceAddrSize;
+    struct sockaddr_in* groupIpAddr;
+    struct sockaddr_in* interfaceIpAddr;
+    struct ip_mreq mreq;
+
+    struct sockaddr_in6* groupIp6Addr;
+    struct ipv6_mreq mreq6;
+
+    memset(&groupAddr, 0, sizeof(groupAddr));
+    memset(&interfaceAddr, 0, sizeof(interfaceAddr));
+
+    if (netty_unix_socket_initSockaddr(env, ipv6, groupAddress, scopeId, 0, &groupAddr, &groupAddrSize) == -1) {
+        netty_unix_errors_throwIOException(env, "Could not init sockaddr for groupAddress");
+        return;
+    }
+
+    switch (groupAddr.ss_family) {
+    case AF_INET:
+        if (netty_unix_socket_initSockaddr(env, ipv6, interfaceAddress, scopeId, 0, &interfaceAddr, &interfaceAddrSize) == -1) {
+            netty_unix_errors_throwIOException(env, "Could not init sockaddr for interfaceAddr");
+            return;
+        }
+
+        interfaceIpAddr = (struct sockaddr_in*) &interfaceAddr;
+        groupIpAddr = (struct sockaddr_in*) &groupAddr;
+
+        memcpy(&mreq.imr_multiaddr, &groupIpAddr->sin_addr, sizeof(groupIpAddr->sin_addr));
+        memcpy(&mreq.imr_interface, &interfaceIpAddr->sin_addr, sizeof(interfaceIpAddr->sin_addr));
+        netty_unix_socket_setOption(env, fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq));
+        break;
+    case AF_INET6:
+        if (interfaceIndex == -1) {
+            netty_unix_errors_throwIOException(env, "Unable to find network index");
+            return;
+        }
+        mreq6.ipv6mr_interface = interfaceIndex;
+
+        groupIp6Addr = (struct sockaddr_in6*) &groupAddr;
+        memcpy(&mreq6.ipv6mr_multiaddr, &groupIp6Addr->sin6_addr, sizeof(groupIp6Addr->sin6_addr));
+        netty_unix_socket_setOption(env, fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6, sizeof(mreq6));
+        break;
+    default:
+        netty_unix_errors_throwIOException(env, "Address family not supported");
+        break;
+    }
+}
+
+static void netty_epoll_linuxsocket_joinSsmGroup(JNIEnv* env, jclass clazz, jint fd, jboolean ipv6, jbyteArray groupAddress, jbyteArray interfaceAddress, jint scopeId, jint interfaceIndex, jbyteArray sourceAddress) {
+    struct sockaddr_storage groupAddr;
+    socklen_t groupAddrSize;
+    struct sockaddr_storage interfaceAddr;
+    socklen_t interfaceAddrSize;
+    struct sockaddr_storage sourceAddr;
+    socklen_t sourceAddrSize;
+    struct sockaddr_in* groupIpAddr;
+    struct sockaddr_in* interfaceIpAddr;
+    struct sockaddr_in* sourceIpAddr;
+    struct ip_mreq_source mreq;
+
+    struct group_source_req mreq6;
+
+    memset(&groupAddr, 0, sizeof(groupAddr));
+    memset(&sourceAddr, 0, sizeof(sourceAddr));
+    memset(&interfaceAddr, 0, sizeof(interfaceAddr));
+
+    if (netty_unix_socket_initSockaddr(env, ipv6, groupAddress, scopeId, 0, &groupAddr, &groupAddrSize) == -1) {
+        netty_unix_errors_throwIOException(env, "Could not init sockaddr for groupAddress");
+        return;
+    }
+
+    if (netty_unix_socket_initSockaddr(env, ipv6, sourceAddress, scopeId, 0, &sourceAddr, &sourceAddrSize) == -1) {
+        netty_unix_errors_throwIOException(env, "Could not init sockaddr for sourceAddress");
+        return;
+    }
+
+    switch (groupAddr.ss_family) {
+    case AF_INET:
+        if (netty_unix_socket_initSockaddr(env, ipv6, interfaceAddress, scopeId, 0, &interfaceAddr, &interfaceAddrSize) == -1) {
+            netty_unix_errors_throwIOException(env, "Could not init sockaddr for interfaceAddress");
+            return;
+        }
+        interfaceIpAddr = (struct sockaddr_in*) &interfaceAddr;
+        groupIpAddr = (struct sockaddr_in*) &groupAddr;
+        sourceIpAddr = (struct sockaddr_in*) &sourceAddr;
+        memcpy(&mreq.imr_multiaddr, &groupIpAddr->sin_addr, sizeof(groupIpAddr->sin_addr));
+        memcpy(&mreq.imr_interface, &interfaceIpAddr->sin_addr, sizeof(interfaceIpAddr->sin_addr));
+        memcpy(&mreq.imr_sourceaddr, &sourceIpAddr->sin_addr, sizeof(sourceIpAddr->sin_addr));
+        netty_unix_socket_setOption(env, fd, IPPROTO_IP, IP_ADD_SOURCE_MEMBERSHIP, &mreq, sizeof(mreq));
+        break;
+    case AF_INET6:
+        if (interfaceIndex == -1) {
+            netty_unix_errors_throwIOException(env, "Unable to find network index");
+            return;
+        }
+        mreq6.gsr_group = groupAddr;
+        mreq6.gsr_interface = interfaceIndex;
+        mreq6.gsr_source = sourceAddr;
+        netty_unix_socket_setOption(env, fd, IPPROTO_IPV6, MCAST_JOIN_SOURCE_GROUP, &mreq6, sizeof(mreq6));
+        break;
+    default:
+        netty_unix_errors_throwIOException(env, "Address family not supported");
+        break;
+    }
+}
+
+static void netty_epoll_linuxsocket_leaveGroup(JNIEnv* env, jclass clazz, jint fd, jboolean ipv6, jbyteArray groupAddress, jbyteArray interfaceAddress, jint scopeId, jint interfaceIndex) {
+    struct sockaddr_storage groupAddr;
+    socklen_t groupAddrSize;
+
+    struct sockaddr_storage interfaceAddr;
+    socklen_t interfaceAddrSize;
+    struct sockaddr_in* groupIpAddr;
+    struct sockaddr_in* interfaceIpAddr;
+    struct ip_mreq mreq;
+
+    struct sockaddr_in6* groupIp6Addr;
+    struct ipv6_mreq mreq6;
+
+    memset(&groupAddr, 0, sizeof(groupAddr));
+    memset(&interfaceAddr, 0, sizeof(interfaceAddr));
+
+    if (netty_unix_socket_initSockaddr(env, ipv6, groupAddress, scopeId, 0, &groupAddr, &groupAddrSize) == -1) {
+        netty_unix_errors_throwIOException(env, "Could not init sockaddr for groupAddress");
+        return;
+    }
+
+    switch (groupAddr.ss_family) {
+    case AF_INET:
+        if (netty_unix_socket_initSockaddr(env, ipv6, interfaceAddress, scopeId, 0, &interfaceAddr, &interfaceAddrSize) == -1) {
+            netty_unix_errors_throwIOException(env, "Could not init sockaddr for interfaceAddress");
+            return;
+        }
+        interfaceIpAddr = (struct sockaddr_in*) &interfaceAddr;
+        groupIpAddr = (struct sockaddr_in*) &groupAddr;
+
+        memcpy(&mreq.imr_multiaddr, &groupIpAddr->sin_addr, sizeof(groupIpAddr->sin_addr));
+        memcpy(&mreq.imr_interface, &interfaceIpAddr->sin_addr, sizeof(interfaceIpAddr->sin_addr));
+        netty_unix_socket_setOption(env, fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq));
+        break;
+    case AF_INET6:
+        if (interfaceIndex == -1) {
+            netty_unix_errors_throwIOException(env, "Unable to find network index");
+            return;
+        }
+        mreq6.ipv6mr_interface = interfaceIndex;
+
+        groupIp6Addr = (struct sockaddr_in6*) &groupAddr;
+        memcpy(&mreq6.ipv6mr_multiaddr, &groupIp6Addr->sin6_addr, sizeof(groupIp6Addr->sin6_addr));
+        netty_unix_socket_setOption(env, fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq6, sizeof(mreq6));
+        break;
+    default:
+        netty_unix_errors_throwIOException(env, "Address family not supported");
+        break;
+    }
+}
+
+static void netty_epoll_linuxsocket_leaveSsmGroup(JNIEnv* env, jclass clazz, jint fd, jboolean ipv6, jbyteArray groupAddress, jbyteArray interfaceAddress, jint scopeId, jint interfaceIndex, jbyteArray sourceAddress) {
+    struct sockaddr_storage groupAddr;
+    socklen_t groupAddrSize;
+    struct sockaddr_storage interfaceAddr;
+    socklen_t interfaceAddrSize;
+    struct sockaddr_storage sourceAddr;
+    socklen_t sourceAddrSize;
+    struct sockaddr_in* groupIpAddr;
+    struct sockaddr_in* interfaceIpAddr;
+    struct sockaddr_in* sourceIpAddr;
+
+    struct ip_mreq_source mreq;
+    struct group_source_req mreq6;
+
+    memset(&groupAddr, 0, sizeof(groupAddr));
+    memset(&sourceAddr, 0, sizeof(sourceAddr));
+    memset(&interfaceAddr, 0, sizeof(interfaceAddr));
+
+
+    if (netty_unix_socket_initSockaddr(env, ipv6, groupAddress, scopeId, 0, &groupAddr, &groupAddrSize) == -1) {
+        netty_unix_errors_throwIOException(env, "Could not init sockaddr for groupAddress");
+        return;
+    }
+
+    if (netty_unix_socket_initSockaddr(env, ipv6, sourceAddress, scopeId, 0, &sourceAddr, &sourceAddrSize) == -1) {
+        netty_unix_errors_throwIOException(env, "Could not init sockaddr for sourceAddress");
+        return;
+    }
+
+    switch (groupAddr.ss_family) {
+    case AF_INET:
+        if (netty_unix_socket_initSockaddr(env, ipv6, interfaceAddress, scopeId, 0, &interfaceAddr, &interfaceAddrSize) == -1) {
+            netty_unix_errors_throwIOException(env, "Could not init sockaddr for interfaceAddress");
+            return;
+        }
+        interfaceIpAddr = (struct sockaddr_in*) &interfaceAddr;
+
+        groupIpAddr = (struct sockaddr_in*) &groupAddr;
+        sourceIpAddr = (struct sockaddr_in*) &sourceAddr;
+        memcpy(&mreq.imr_multiaddr, &groupIpAddr->sin_addr, sizeof(groupIpAddr->sin_addr));
+        memcpy(&mreq.imr_interface, &interfaceIpAddr->sin_addr, sizeof(interfaceIpAddr->sin_addr));
+        memcpy(&mreq.imr_sourceaddr, &sourceIpAddr->sin_addr, sizeof(sourceIpAddr->sin_addr));
+        netty_unix_socket_setOption(env, fd, IPPROTO_IP, IP_DROP_SOURCE_MEMBERSHIP, &mreq, sizeof(mreq));
+        break;
+    case AF_INET6:
+        if (interfaceIndex == -1) {
+            netty_unix_errors_throwIOException(env, "Unable to find network index");
+            return;
+        }
+
+        mreq6.gsr_group = groupAddr;
+        mreq6.gsr_interface = interfaceIndex;
+        mreq6.gsr_source = sourceAddr;
+        netty_unix_socket_setOption(env, fd, IPPROTO_IPV6, MCAST_LEAVE_SOURCE_GROUP, &mreq6, sizeof(mreq6));
+        break;
+    default:
+        netty_unix_errors_throwIOException(env, "Address family not supported");
+        break;
+    }
+}
+
+static void netty_epoll_linuxsocket_setTcpMd5Sig(JNIEnv* env, jclass clazz, jint fd, jboolean ipv6, jbyteArray address, jint scopeId, jbyteArray key) {
+    struct sockaddr_storage addr;
+    socklen_t addrSize;
+
+    memset(&addr, 0, sizeof(addr));
+
+    if (netty_unix_socket_initSockaddr(env, ipv6, address, scopeId, 0, &addr, &addrSize) == -1) {
+        netty_unix_errors_throwIOException(env, "Could not init sockaddr");
+        return;
+    }
+
+    struct tcp_md5sig md5sig;
+    memset(&md5sig, 0, sizeof(md5sig));
+    md5sig.tcpm_addr.ss_family = addr.ss_family;
+
+    struct sockaddr_in* ipaddr;
+    struct sockaddr_in6* ip6addr;
+
+    switch (addr.ss_family) {
+    case AF_INET:
+        ipaddr = (struct sockaddr_in*) &addr;
+        memcpy(&((struct sockaddr_in *) &md5sig.tcpm_addr)->sin_addr, &ipaddr->sin_addr, sizeof(ipaddr->sin_addr));
+        break;
+    case AF_INET6:
+        ip6addr = (struct sockaddr_in6*) &addr;
+        memcpy(&((struct sockaddr_in6 *) &md5sig.tcpm_addr)->sin6_addr, &ip6addr->sin6_addr, sizeof(ip6addr->sin6_addr));
+        break;
+    }
+
+    if (key != NULL) {
+        md5sig.tcpm_keylen = (*env)->GetArrayLength(env, key);
+        (*env)->GetByteArrayRegion(env, key, 0, md5sig.tcpm_keylen, (void *) &md5sig.tcpm_key);
+        if ((*env)->ExceptionCheck(env) == JNI_TRUE) {
+            return;
+        }
+    }
+
+    if (setsockopt(fd, IPPROTO_TCP, TCP_MD5SIG, &md5sig, sizeof(md5sig)) < 0) {
+        netty_unix_errors_throwIOExceptionErrorNo(env, "setsockopt() failed: ", errno);
+    }
+}
+
+static int netty_epoll_linuxsocket_getInterface(JNIEnv* env, jclass clazz, jint fd, jboolean ipv6) {
+    if (ipv6 == JNI_TRUE) {
+        int optval;
+        if (netty_unix_socket_getOption(env, fd, IPPROTO_IPV6, IPV6_MULTICAST_IF, &optval, sizeof(optval)) == -1) {
+            return -1;
+        }
+        return optval;
+    } else {
+        struct in_addr optval;
+        if (netty_unix_socket_getOption(env, fd, IPPROTO_IP, IP_MULTICAST_IF, &optval, sizeof(optval)) == -1) {
+            return -1;
+        }
+
+        return ntohl(optval.s_addr);
+    }
+}
+
+static jint netty_epoll_linuxsocket_getTimeToLive(JNIEnv* env, jclass clazz, jint fd) {
+    int optval;
+    if (netty_unix_socket_getOption(env, fd, IPPROTO_IP, IP_TTL, &optval, sizeof(optval)) == -1) {
+        return -1;
+    }
+    return optval;
+}
+
+
+static jint netty_epoll_linuxsocket_getIpMulticastLoop(JNIEnv* env, jclass clazz, jint fd, jboolean ipv6) {
+    if (ipv6 == JNI_TRUE) {
+        u_int optval;
+        if (netty_unix_socket_getOption(env, fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &optval, sizeof(optval)) == -1) {
+            return -1;
+        }
+        return (jint) optval;
+    } else {
+        u_char optval;
+        if (netty_unix_socket_getOption(env, fd, IPPROTO_IP, IP_MULTICAST_LOOP, &optval, sizeof(optval)) == -1) {
+            return -1;
+        }
+        return (jint) optval;
+    }
+}
+
+static jint netty_epoll_linuxsocket_getTcpKeepIdle(JNIEnv* env, jclass clazz, jint fd) {
+    int optval;
+    if (netty_unix_socket_getOption(env, fd, IPPROTO_TCP, TCP_KEEPIDLE, &optval, sizeof(optval)) == -1) {
+        return -1;
+    }
+    return optval;
+}
+
+static jint netty_epoll_linuxsocket_getTcpKeepIntvl(JNIEnv* env, jclass clazz, jint fd) {
+    int optval;
+    if (netty_unix_socket_getOption(env, fd, IPPROTO_TCP, TCP_KEEPINTVL, &optval, sizeof(optval)) == -1) {
+        return -1;
+    }
+    return optval;
+}
+
+static jint netty_epoll_linuxsocket_getTcpKeepCnt(JNIEnv* env, jclass clazz, jint fd) {
+     int optval;
+     if (netty_unix_socket_getOption(env, fd, IPPROTO_TCP, TCP_KEEPCNT, &optval, sizeof(optval)) == -1) {
+         return -1;
+     }
+     return optval;
+}
+
+static jint netty_epoll_linuxsocket_getTcpUserTimeout(JNIEnv* env, jclass clazz, jint fd) {
+     int optval;
+     if (netty_unix_socket_getOption(env, fd, IPPROTO_TCP, TCP_USER_TIMEOUT, &optval, sizeof(optval)) == -1) {
+         return -1;
+     }
+     return optval;
+}
+
+static jint netty_epoll_linuxsocket_isIpFreeBind(JNIEnv* env, jclass clazz, jint fd) {
+     int optval;
+     if (netty_unix_socket_getOption(env, fd, IPPROTO_IP, IP_FREEBIND, &optval, sizeof(optval)) == -1) {
+         return -1;
+     }
+     return optval;
+}
+
+static jint netty_epoll_linuxsocket_isIpTransparent(JNIEnv* env, jclass clazz, jint fd) {
+     int optval;
+     if (netty_unix_socket_getOption(env, fd, SOL_IP, IP_TRANSPARENT, &optval, sizeof(optval)) == -1) {
+         return -1;
+     }
+     return optval;
+}
+
+static jint netty_epoll_linuxsocket_isIpRecvOrigDestAddr(JNIEnv* env, jclass clazz, jint fd) {
+     int optval;
+     if (netty_unix_socket_getOption(env, fd, IPPROTO_IP, IP_RECVORIGDSTADDR, &optval, sizeof(optval)) == -1) {
+         return -1;
+     }
+     return optval;
+}
+
+static void netty_epoll_linuxsocket_getTcpInfo(JNIEnv* env, jclass clazz, jint fd, jlongArray array) {
+     struct tcp_info tcp_info;
+     if (netty_unix_socket_getOption(env, fd, IPPROTO_TCP, TCP_INFO, &tcp_info, sizeof(tcp_info)) == -1) {
+         return;
+     }
+     jlong cArray[32];
+     // Expand to 64 bits, then cast away unsigned-ness.
+     cArray[0] = (jlong) (uint64_t) tcp_info.tcpi_state;
+     cArray[1] = (jlong) (uint64_t) tcp_info.tcpi_ca_state;
+     cArray[2] = (jlong) (uint64_t) tcp_info.tcpi_retransmits;
+     cArray[3] = (jlong) (uint64_t) tcp_info.tcpi_probes;
+     cArray[4] = (jlong) (uint64_t) tcp_info.tcpi_backoff;
+     cArray[5] = (jlong) (uint64_t) tcp_info.tcpi_options;
+     cArray[6] = (jlong) (uint64_t) tcp_info.tcpi_snd_wscale;
+     cArray[7] = (jlong) (uint64_t) tcp_info.tcpi_rcv_wscale;
+     cArray[8] = (jlong) (uint64_t) tcp_info.tcpi_rto;
+     cArray[9] = (jlong) (uint64_t) tcp_info.tcpi_ato;
+     cArray[10] = (jlong) (uint64_t) tcp_info.tcpi_snd_mss;
+     cArray[11] = (jlong) (uint64_t) tcp_info.tcpi_rcv_mss;
+     cArray[12] = (jlong) (uint64_t) tcp_info.tcpi_unacked;
+     cArray[13] = (jlong) (uint64_t) tcp_info.tcpi_sacked;
+     cArray[14] = (jlong) (uint64_t) tcp_info.tcpi_lost;
+     cArray[15] = (jlong) (uint64_t) tcp_info.tcpi_retrans;
+     cArray[16] = (jlong) (uint64_t) tcp_info.tcpi_fackets;
+     cArray[17] = (jlong) (uint64_t) tcp_info.tcpi_last_data_sent;
+     cArray[18] = (jlong) (uint64_t) tcp_info.tcpi_last_ack_sent;
+     cArray[19] = (jlong) (uint64_t) tcp_info.tcpi_last_data_recv;
+     cArray[20] = (jlong) (uint64_t) tcp_info.tcpi_last_ack_recv;
+     cArray[21] = (jlong) (uint64_t) tcp_info.tcpi_pmtu;
+     cArray[22] = (jlong) (uint64_t) tcp_info.tcpi_rcv_ssthresh;
+     cArray[23] = (jlong) (uint64_t) tcp_info.tcpi_rtt;
+     cArray[24] = (jlong) (uint64_t) tcp_info.tcpi_rttvar;
+     cArray[25] = (jlong) (uint64_t) tcp_info.tcpi_snd_ssthresh;
+     cArray[26] = (jlong) (uint64_t) tcp_info.tcpi_snd_cwnd;
+     cArray[27] = (jlong) (uint64_t) tcp_info.tcpi_advmss;
+     cArray[28] = (jlong) (uint64_t) tcp_info.tcpi_reordering;
+     cArray[29] = (jlong) (uint64_t) tcp_info.tcpi_rcv_rtt;
+     cArray[30] = (jlong) (uint64_t) tcp_info.tcpi_rcv_space;
+     cArray[31] = (jlong) (uint64_t) tcp_info.tcpi_total_retrans;
+
+     (*env)->SetLongArrayRegion(env, array, 0, 32, cArray);
+}
+
+static jint netty_epoll_linuxsocket_isTcpCork(JNIEnv* env, jclass clazz, jint fd) {
+    int optval;
+    if (netty_unix_socket_getOption(env, fd, IPPROTO_TCP, TCP_CORK, &optval, sizeof(optval)) == -1) {
+        return -1;
+    }
+    return optval;
+}
+
+static jint netty_epoll_linuxsocket_getSoBusyPoll(JNIEnv* env, jclass clazz, jint fd) {
+    int optval;
+    if (netty_unix_socket_getOption(env, fd, SOL_SOCKET, SO_BUSY_POLL, &optval, sizeof(optval)) == -1) {
+        return -1;
+    }
+    return optval;
+}
+
+static jint netty_epoll_linuxsocket_getTcpDeferAccept(JNIEnv* env, jclass clazz, jint fd) {
+    int optval;
+    if (netty_unix_socket_getOption(env, fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &optval, sizeof(optval)) == -1) {
+        return -1;
+    }
+    return optval;
+}
+
+static jint netty_epoll_linuxsocket_isTcpQuickAck(JNIEnv* env, jclass clazz, jint fd) {
+    int optval;
+    if (netty_unix_socket_getOption(env, fd, IPPROTO_TCP, TCP_QUICKACK, &optval, sizeof(optval)) == -1) {
+        return -1;
+    }
+    return optval;
+}
+
+static jint netty_epoll_linuxsocket_getTcpNotSentLowAt(JNIEnv* env, jclass clazz, jint fd) {
+    int optval;
+    if (netty_unix_socket_getOption(env, fd, IPPROTO_TCP, TCP_NOTSENT_LOWAT, &optval, sizeof(optval)) == -1) {
+        return -1;
+    }
+    return optval;
+}
+
+static jobject netty_epoll_linuxsocket_getPeerCredentials(JNIEnv *env, jclass clazz, jint fd) {
+     struct ucred credentials;
+     jclass peerCredentialsClass = NULL;
+     if(netty_unix_socket_getOption(env,fd, SOL_SOCKET, SO_PEERCRED, &credentials, sizeof (credentials)) == -1) {
+         return NULL;
+     }
+     jintArray gids = (*env)->NewIntArray(env, 1);
+     (*env)->SetIntArrayRegion(env, gids, 0, 1, (jint*) &credentials.gid);
+
+     NETTY_JNI_UTIL_NEW_LOCAL_FROM_WEAK(env, peerCredentialsClass, peerCredentialsClassWeak, error);
+
+     jobject creds = (*env)->NewObject(env, peerCredentialsClass, peerCredentialsMethodId, credentials.pid, credentials.uid, gids);
+
+     NETTY_JNI_UTIL_DELETE_LOCAL(env, peerCredentialsClass);
+     return creds;
+ error:
+     return NULL;
+}
+
+static jint netty_epoll_linuxsocket_isUdpGro(JNIEnv* env, jclass clazz, jint fd) {
+     int optval;
+     if (netty_unix_socket_getOption(env, fd, SOL_UDP, UDP_GRO, &optval, sizeof(optval)) == -1) {
+         return -1;
+     }
+     return optval;
+}
+
+static void netty_epoll_linuxsocket_setUdpGro(JNIEnv* env, jclass clazz, jint fd, jint optval) {
+    netty_unix_socket_setOption(env, fd, SOL_UDP, UDP_GRO, &optval, sizeof(optval));
+}
+
+
+static jlong netty_epoll_linuxsocket_sendFile(JNIEnv* env, jclass clazz, jint fd, jobject fileRegion, jlong base_off, jlong off, jlong len) {
+    jobject fileChannel = (*env)->GetObjectField(env, fileRegion, fileChannelFieldId);
+    if (fileChannel == NULL) {
+        netty_unix_errors_throwRuntimeException(env, "failed to get DefaultFileRegion.file");
+        return -1;
+    }
+    jobject fileDescriptor = (*env)->GetObjectField(env, fileChannel, fileDescriptorFieldId);
+    if (fileDescriptor == NULL) {
+        netty_unix_errors_throwRuntimeException(env, "failed to get FileChannelImpl.fd");
+        return -1;
+    }
+    jint srcFd = (*env)->GetIntField(env, fileDescriptor, fdFieldId);
+    if (srcFd == -1) {
+        netty_unix_errors_throwRuntimeException(env, "failed to get FileDescriptor.fd");
+        return -1;
+    }
+    ssize_t res;
+    off_t offset = base_off + off;
+    int err;
+    do {
+      res = sendfile(fd, srcFd, &offset, (size_t) len);
+    } while (res == -1 && ((err = errno) == EINTR));
+    if (res < 0) {
+        return -err;
+    }
+    if (res > 0) {
+        // update the transferred field in DefaultFileRegion
+        (*env)->SetLongField(env, fileRegion, transferredFieldId, off + res);
+    }
+
+    return res;
+}
+
+// JNI Registered Methods End
+
+// JNI Method Registration Table Begin
+static const JNINativeMethod fixed_method_table[] = {
+  { "newVSockStreamFd", "()I", (void *) netty_epoll_linuxsocket_newVSockStreamFd },
+  { "bindVSock", "(III)I", (void *) netty_epoll_linuxsocket_bindVSock },
+  { "connectVSock", "(III)I", (void *) netty_epoll_linuxsocket_connectVSock },
+  { "remoteVSockAddress", "(I)[B", (void *) netty_epoll_linuxsocket_remoteVSockAddress },
+  { "localVSockAddress", "(I)[B", (void *) netty_epoll_linuxsocket_localVSockAddress },
+  { "setTimeToLive", "(II)V", (void *) netty_epoll_linuxsocket_setTimeToLive },
+  { "getTimeToLive", "(I)I", (void *) netty_epoll_linuxsocket_getTimeToLive },
+  { "setInterface", "(IZ[BII)V", (void *) netty_epoll_linuxsocket_setInterface },
+  { "getInterface", "(IZ)I", (void *) netty_epoll_linuxsocket_getInterface },
+  { "setIpMulticastLoop", "(IZI)V", (void * ) netty_epoll_linuxsocket_setIpMulticastLoop },
+  { "getIpMulticastLoop", "(IZ)I", (void * ) netty_epoll_linuxsocket_getIpMulticastLoop },
+  { "setTcpCork", "(II)V", (void *) netty_epoll_linuxsocket_setTcpCork },
+  { "setSoBusyPoll", "(II)V", (void *) netty_epoll_linuxsocket_setSoBusyPoll },
+  { "setTcpQuickAck", "(II)V", (void *) netty_epoll_linuxsocket_setTcpQuickAck },
+  { "setTcpDeferAccept", "(II)V", (void *) netty_epoll_linuxsocket_setTcpDeferAccept },
+  { "setTcpNotSentLowAt", "(II)V", (void *) netty_epoll_linuxsocket_setTcpNotSentLowAt },
+  { "isTcpCork", "(I)I", (void *) netty_epoll_linuxsocket_isTcpCork },
+  { "getSoBusyPoll", "(I)I", (void *) netty_epoll_linuxsocket_getSoBusyPoll },
+  { "getTcpDeferAccept", "(I)I", (void *) netty_epoll_linuxsocket_getTcpDeferAccept },
+  { "getTcpNotSentLowAt", "(I)I", (void *) netty_epoll_linuxsocket_getTcpNotSentLowAt },
+  { "isTcpQuickAck", "(I)I", (void *) netty_epoll_linuxsocket_isTcpQuickAck },
+  { "setTcpFastOpen", "(II)V", (void *) netty_epoll_linuxsocket_setTcpFastOpen },
+  { "setTcpKeepIdle", "(II)V", (void *) netty_epoll_linuxsocket_setTcpKeepIdle },
+  { "setTcpKeepIntvl", "(II)V", (void *) netty_epoll_linuxsocket_setTcpKeepIntvl },
+  { "setTcpKeepCnt", "(II)V", (void *) netty_epoll_linuxsocket_setTcpKeepCnt },
+  { "setTcpUserTimeout", "(II)V", (void *) netty_epoll_linuxsocket_setTcpUserTimeout },
+  { "setIpFreeBind", "(II)V", (void *) netty_epoll_linuxsocket_setIpFreeBind },
+  { "setIpTransparent", "(II)V", (void *) netty_epoll_linuxsocket_setIpTransparent },
+  { "setIpRecvOrigDestAddr", "(II)V", (void *) netty_epoll_linuxsocket_setIpRecvOrigDestAddr },
+  { "getTcpKeepIdle", "(I)I", (void *) netty_epoll_linuxsocket_getTcpKeepIdle },
+  { "getTcpKeepIntvl", "(I)I", (void *) netty_epoll_linuxsocket_getTcpKeepIntvl },
+  { "getTcpKeepCnt", "(I)I", (void *) netty_epoll_linuxsocket_getTcpKeepCnt },
+  { "getTcpUserTimeout", "(I)I", (void *) netty_epoll_linuxsocket_getTcpUserTimeout },
+  { "isIpFreeBind", "(I)I", (void *) netty_epoll_linuxsocket_isIpFreeBind },
+  { "isIpTransparent", "(I)I", (void *) netty_epoll_linuxsocket_isIpTransparent },
+  { "isIpRecvOrigDestAddr", "(I)I", (void *) netty_epoll_linuxsocket_isIpRecvOrigDestAddr },
+  { "getTcpInfo", "(I[J)V", (void *) netty_epoll_linuxsocket_getTcpInfo },
+  { "setTcpMd5Sig", "(IZ[BI[B)V", (void *) netty_epoll_linuxsocket_setTcpMd5Sig },
+  { "joinGroup", "(IZ[B[BII)V", (void *) netty_epoll_linuxsocket_joinGroup },
+  { "joinSsmGroup", "(IZ[B[BII[B)V", (void *) netty_epoll_linuxsocket_joinSsmGroup },
+  { "leaveGroup", "(IZ[B[BII)V", (void *) netty_epoll_linuxsocket_leaveGroup },
+  { "leaveSsmGroup", "(IZ[B[BII[B)V", (void *) netty_epoll_linuxsocket_leaveSsmGroup },
+  { "isUdpGro", "(I)I", (void *) netty_epoll_linuxsocket_isUdpGro },
+  { "setUdpGro", "(II)V", (void *) netty_epoll_linuxsocket_setUdpGro }
+
+  // "sendFile" has a dynamic signature
+};
+
+static const jint fixed_method_table_size = sizeof(fixed_method_table) / sizeof(fixed_method_table[0]);
+
+static jint dynamicMethodsTableSize() {
+    return fixed_method_table_size + 2; // 2 is for the dynamic method signatures.
+}
+
+static JNINativeMethod* createDynamicMethodsTable(const char* packagePrefix) {
+    char* dynamicTypeName = NULL;
+    size_t size = sizeof(JNINativeMethod) * dynamicMethodsTableSize();
+    JNINativeMethod* dynamicMethods = malloc(size);
+    if (dynamicMethods == NULL) {
+        return NULL;
+    }
+    memset(dynamicMethods, 0, size);
+    memcpy(dynamicMethods, fixed_method_table, sizeof(fixed_method_table));
+  
+    JNINativeMethod* dynamicMethod = &dynamicMethods[fixed_method_table_size];
+    NETTY_JNI_UTIL_PREPEND(packagePrefix, "io/netty/channel/unix/PeerCredentials;", dynamicTypeName, error);
+    NETTY_JNI_UTIL_PREPEND("(I)L", dynamicTypeName,  dynamicMethod->signature, error);
+    dynamicMethod->name = "getPeerCredentials";
+    dynamicMethod->fnPtr = (void *) netty_epoll_linuxsocket_getPeerCredentials;
+    netty_jni_util_free_dynamic_name(&dynamicTypeName);
+
+    ++dynamicMethod;
+    NETTY_JNI_UTIL_PREPEND(packagePrefix, "io/netty/channel/DefaultFileRegion;JJJ)J", dynamicTypeName, error);
+    NETTY_JNI_UTIL_PREPEND("(IL", dynamicTypeName,  dynamicMethod->signature, error);
+    dynamicMethod->name = "sendFile";
+    dynamicMethod->fnPtr = (void *) netty_epoll_linuxsocket_sendFile;
+    netty_jni_util_free_dynamic_name(&dynamicTypeName);
+    return dynamicMethods;
+error:
+    free(dynamicTypeName);
+    netty_jni_util_free_dynamic_methods_table(dynamicMethods, fixed_method_table_size, dynamicMethodsTableSize());
+    return NULL;
+}
+
+// JNI Method Registration Table End
+
+// IMPORTANT: If you add any NETTY_JNI_UTIL_LOAD_CLASS or NETTY_JNI_UTIL_FIND_CLASS calls you also need to update
+//            Native to reflect that.
+jint netty_epoll_linuxsocket_JNI_OnLoad(JNIEnv* env, const char* packagePrefix) {
+    int ret = JNI_ERR;
+    char* nettyClassName = NULL;
+    jclass fileRegionCls = NULL;
+    jclass fileChannelCls = NULL;
+    jclass fileDescriptorCls = NULL;
+    jclass peerCredentialsClass = NULL;
+    // Register the methods which are not referenced by static member variables
+    JNINativeMethod* dynamicMethods = createDynamicMethodsTable(packagePrefix);
+    if (dynamicMethods == NULL) {
+        goto done;
+    }
+    if (netty_jni_util_register_natives(env,
+            packagePrefix,
+            LINUXSOCKET_CLASSNAME,
+            dynamicMethods,
+            dynamicMethodsTableSize()) != 0) {
+        goto done;
+    }
+
+    NETTY_JNI_UTIL_PREPEND(packagePrefix, "io/netty/channel/unix/PeerCredentials", nettyClassName, done);
+
+    NETTY_JNI_UTIL_LOAD_CLASS_WEAK(env, peerCredentialsClassWeak, nettyClassName, done);
+    NETTY_JNI_UTIL_NEW_LOCAL_FROM_WEAK(env, peerCredentialsClass, peerCredentialsClassWeak, done);
+
+    netty_jni_util_free_dynamic_name(&nettyClassName);
+
+    NETTY_JNI_UTIL_GET_METHOD(env, peerCredentialsClass, peerCredentialsMethodId, "<init>", "(II[I)V", done);
+
+    NETTY_JNI_UTIL_PREPEND(packagePrefix, "io/netty/channel/DefaultFileRegion", nettyClassName, done);
+    NETTY_JNI_UTIL_FIND_CLASS(env, fileRegionCls, nettyClassName, done);
+    netty_jni_util_free_dynamic_name(&nettyClassName);
+
+    NETTY_JNI_UTIL_GET_FIELD(env, fileRegionCls, fileChannelFieldId, "file", "Ljava/nio/channels/FileChannel;", done);
+    NETTY_JNI_UTIL_GET_FIELD(env, fileRegionCls, transferredFieldId, "transferred", "J", done);
+
+    NETTY_JNI_UTIL_FIND_CLASS(env, fileChannelCls, "sun/nio/ch/FileChannelImpl", done);
+    NETTY_JNI_UTIL_GET_FIELD(env, fileChannelCls, fileDescriptorFieldId, "fd", "Ljava/io/FileDescriptor;", done);
+
+    NETTY_JNI_UTIL_FIND_CLASS(env, fileDescriptorCls, "java/io/FileDescriptor", done);
+    NETTY_JNI_UTIL_TRY_GET_FIELD(env, fileDescriptorCls, fdFieldId, "fd", "I");
+    if (fdFieldId == NULL) {
+         // Android uses a different field name, let's try it.
+         NETTY_JNI_UTIL_GET_FIELD(env, fileDescriptorCls, fdFieldId, "descriptor", "I", done);
+    }
+    ret = NETTY_JNI_UTIL_JNI_VERSION;
+done:
+    netty_jni_util_free_dynamic_methods_table(dynamicMethods, fixed_method_table_size, dynamicMethodsTableSize());
+    free(nettyClassName);
+
+    NETTY_JNI_UTIL_DELETE_LOCAL(env, peerCredentialsClass);
+    return ret;
+}
+
+void netty_epoll_linuxsocket_JNI_OnUnLoad(JNIEnv* env, const char* packagePrefix) {
+    NETTY_JNI_UTIL_UNLOAD_CLASS_WEAK(env, peerCredentialsClassWeak);
+
+    netty_jni_util_unregister_natives(env, packagePrefix, LINUXSOCKET_CLASSNAME);
+}

netty-channel-epoll-native/src/main/c/netty_epoll_linuxsocket.h

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+#ifndef NETTY_EPOLL_LINUXSOCKET_H_
+#define NETTY_EPOLL_LINUXSOCKET_H_
+
+#include <jni.h>
+
+// JNI initialization hooks. Users of this file are responsible for calling these in the JNI_OnLoad and JNI_OnUnload methods.
+jint netty_epoll_linuxsocket_JNI_OnLoad(JNIEnv* env, const char* packagePrefix);
+void netty_epoll_linuxsocket_JNI_OnUnLoad(JNIEnv* env, const char* packagePrefix);
+
+#endif

netty-channel-epoll-native/src/main/c/netty_epoll_native.c

@@ -0,0 +1,919 @@
+/*
+ * Copyright 2013 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+#define _GNU_SOURCE
+#include <jni.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/epoll.h>
+#include <sys/eventfd.h>
+#include <sys/un.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/timerfd.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <fcntl.h>
+#include <sys/utsname.h>
+#include <stddef.h>
+#include <limits.h>
+#include <inttypes.h>
+#include <link.h>
+#include <time.h>
+// Needed to be able to use syscalls directly and so not depend on newer GLIBC versions
+#include <linux/net.h>
+#include <sys/syscall.h>
+
+// Needed for UDP_SEGMENT
+#include <netinet/udp.h>
+
+#include "netty_epoll_linuxsocket.h"
+#include "netty_unix_buffer.h"
+#include "netty_unix_errors.h"
+#include "netty_unix_filedescriptor.h"
+#include "netty_unix_jni.h"
+#include "netty_unix_limits.h"
+#include "netty_unix_socket.h"
+#include "netty_unix_util.h"
+#include "netty_unix.h"
+
+// Add define if NETTY_BUILD_STATIC is defined so it is picked up in netty_jni_util.c
+#ifdef NETTY_BUILD_STATIC
+#define NETTY_JNI_UTIL_BUILD_STATIC
+#endif
+
+#define STATICALLY_CLASSNAME "io/netty/channel/epoll/NativeStaticallyReferencedJniMethods"
+#define NATIVE_CLASSNAME "io/netty/channel/epoll/Native"
+
+// TCP_FASTOPEN is defined in linux 3.7. We define this here so older kernels can compile.
+#ifndef TCP_FASTOPEN
+#define TCP_FASTOPEN 23
+#endif
+
+// Allow to compile on systems with older kernels.
+#ifndef UDP_SEGMENT
+#define UDP_SEGMENT	103
+#endif
+
+// UDP_GRO is defined in linux 5. We define this here so older kernels can compile.
+#ifndef UDP_GRO
+#define UDP_GRO 104
+#endif
+
+#ifdef IP_RECVORIGDSTADDR
+#if !defined(SOL_IP) && defined(IPPROTO_IP)
+#define SOL_IP IPPROTO_IP
+#endif /* !SOL_IP && IPPROTO_IP */
+#endif // IP_RECVORIGDSTADDR
+
+// optional
+extern int epoll_create1(int flags) __attribute__((weak));
+extern int epoll_pwait2(int epfd, struct epoll_event *events, int maxevents, const struct timespec *timeout, const sigset_t *sigmask) __attribute__((weak));
+
+#ifndef __USE_GNU
+struct mmsghdr {
+    struct msghdr msg_hdr;  /* Message header */
+    unsigned int  msg_len;  /* Number of bytes transmitted */
+};
+#endif
+
+// All linux syscall numbers are stable so this is safe.
+#ifndef SYS_recvmmsg
+// Only support SYS_recvmmsg for __x86_64__ / __i386__ for now
+#if defined(__x86_64__)
+// See https://github.com/torvalds/linux/blob/v5.4/arch/x86/entry/syscalls/syscall_64.tbl
+#define SYS_recvmmsg 299
+#elif defined(__i386__)
+// See https://github.com/torvalds/linux/blob/v5.4/arch/x86/entry/syscalls/syscall_32.tbl
+#define SYS_recvmmsg 337
+#elif defined(__loongarch64)
+// See https://github.com/torvalds/linux/blob/v6.1/include/uapi/asm-generic/unistd.h
+#define SYS_recvmmsg 243
+#else
+#define SYS_recvmmsg -1
+#endif
+#endif // SYS_recvmmsg
+
+#ifndef SYS_sendmmsg
+// Only support SYS_sendmmsg for __x86_64__ / __i386__ for now
+#if defined(__x86_64__)
+// See https://github.com/torvalds/linux/blob/v5.4/arch/x86/entry/syscalls/syscall_64.tbl
+#define SYS_sendmmsg 307
+#elif defined(__i386__)
+// See https://github.com/torvalds/linux/blob/v5.4/arch/x86/entry/syscalls/syscall_32.tbl
+#define SYS_sendmmsg 345
+#elif defined(__loongarch64)
+// See https://github.com/torvalds/linux/blob/v6.1/include/uapi/asm-generic/unistd.h
+#define SYS_sendmmsg 269
+#else
+#define SYS_sendmmsg -1
+#endif
+#endif // SYS_sendmmsg
+
+// Those are initialized in the init(...) method and cached for performance reasons
+static jfieldID packetSenderAddrFieldId = NULL;
+static jfieldID packetSenderAddrLenFieldId = NULL;
+static jfieldID packetSenderScopeIdFieldId = NULL;
+static jfieldID packetSenderPortFieldId = NULL;
+static jfieldID packetRecipientAddrFieldId = NULL;
+static jfieldID packetRecipientAddrLenFieldId = NULL;
+static jfieldID packetRecipientScopeIdFieldId = NULL;
+static jfieldID packetRecipientPortFieldId = NULL;
+
+static jfieldID packetSegmentSizeFieldId = NULL;
+static jfieldID packetMemoryAddressFieldId = NULL;
+static jfieldID packetCountFieldId = NULL;
+
+static const char* staticPackagePrefix = NULL;
+static int register_unix_called = 0;
+static int epoll_pwait2_supported = 0;
+
+// util methods
+static int getSysctlValue(const char * property, int* returnValue) {
+    int rc = -1;
+    FILE *fd=fopen(property, "r");
+    if (fd != NULL) {
+      char buf[32] = {0x0};
+      if (fgets(buf, 32, fd) != NULL) {
+        *returnValue = atoi(buf);
+        rc = 0;
+      }
+      fclose(fd);
+    }
+    return rc;
+}
+
+static inline jint epollCtl(JNIEnv* env, jint efd, int op, jint fd, jint flags) {
+    uint32_t events = flags;
+    struct epoll_event ev = {
+        .data.fd = fd,
+        .events = events
+    };
+
+    return epoll_ctl(efd, op, fd, &ev);
+}
+// JNI Registered Methods Begin
+static jint netty_epoll_native_eventFd(JNIEnv* env, jclass clazz) {
+    jint eventFD = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
+
+    if (eventFD < 0) {
+        netty_unix_errors_throwChannelExceptionErrorNo(env, "eventfd() failed: ", errno);
+    }
+    return eventFD;
+}
+
+static jint netty_epoll_native_timerFd(JNIEnv* env, jclass clazz) {
+    jint timerFD = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC | TFD_NONBLOCK);
+
+    if (timerFD < 0) {
+        netty_unix_errors_throwChannelExceptionErrorNo(env, "timerfd_create() failed: ", errno);
+    }
+    return timerFD;
+}
+
+static void netty_epoll_native_eventFdWrite(JNIEnv* env, jclass clazz, jint fd, jlong value) {
+    uint64_t val;
+
+    for (;;) {
+        jint ret = eventfd_write(fd, (eventfd_t) value);
+
+        if (ret < 0) {
+            // We need to read before we can write again, let's try to read and then write again and if this
+            // fails we will bail out.
+            //
+            // See https://man7.org/linux/man-pages/man2/eventfd.2.html.
+            if (errno == EAGAIN) {
+                if (eventfd_read(fd, &val) == 0 || errno == EAGAIN) {
+                    // Try again
+                    continue;
+                }
+                netty_unix_errors_throwChannelExceptionErrorNo(env, "eventfd_read(...) failed: ", errno);
+            } else {
+                netty_unix_errors_throwChannelExceptionErrorNo(env, "eventfd_write(...) failed: ", errno);
+            }
+        }
+        break;
+    }
+}
+
+static void netty_epoll_native_eventFdRead(JNIEnv* env, jclass clazz, jint fd) {
+    uint64_t eventfd_t;
+
+    if (eventfd_read(fd, &eventfd_t) != 0) {
+        // something is serious wrong
+        netty_unix_errors_throwRuntimeException(env, "eventfd_read() failed");
+    }
+}
+
+static jint netty_epoll_native_epollCreate(JNIEnv* env, jclass clazz) {
+    jint efd;
+    if (epoll_create1) {
+        efd = epoll_create1(EPOLL_CLOEXEC);
+    } else {
+        // size will be ignored anyway but must be positive
+        efd = epoll_create(126);
+    }
+    if (efd < 0) {
+        int err = errno;
+        if (epoll_create1) {
+            netty_unix_errors_throwChannelExceptionErrorNo(env, "epoll_create1() failed: ", err);
+        } else {
+            netty_unix_errors_throwChannelExceptionErrorNo(env, "epoll_create() failed: ", err);
+        }
+        return efd;
+    }
+    if (!epoll_create1) {
+        if (fcntl(efd, F_SETFD, FD_CLOEXEC) < 0) {
+            int err = errno;
+            close(efd);
+            netty_unix_errors_throwChannelExceptionErrorNo(env, "fcntl() failed: ", err);
+            return err;
+        }
+    }
+    return efd;
+}
+
+static jint netty_epoll_native_epollWait(JNIEnv* env, jclass clazz, jint efd, jlong address, jint len, jint timeout) {
+    struct epoll_event *ev = (struct epoll_event*) (intptr_t) address;
+    int result, err;
+
+    do {
+        result = epoll_wait(efd, ev, len, timeout);
+        if (result >= 0) {
+            return result;
+        }
+    } while((err = errno) == EINTR);
+    return -err;
+}
+
+// This needs to be consistent with Native.java
+#define EPOLL_WAIT_RESULT(V, ARM_TIMER)  ((jlong) ((uint64_t) ((uint32_t) V) << 32 | ARM_TIMER))
+
+static jlong netty_epoll_native_epollWait0(JNIEnv* env, jclass clazz, jint efd, jlong address, jint len, jint timerFd, jint tvSec, jint tvNsec, jlong millisThreshold) {
+    // only reschedule the timer if there is a newer event.
+    // -1 is a special value used by EpollEventLoop.
+    uint32_t armTimer = millisThreshold <= 0 ? 1 : 0;
+    if (tvSec != ((jint) -1) && tvNsec != ((jint) -1)) {
+        if (millisThreshold > 0 && (tvSec != 0 || tvNsec != 0)) {
+            // Let's try to reduce the syscalls as much as possible as timerfd_settime(...) can be expensive:
+            // See https://github.com/netty/netty/issues/11695
+
+            if (epoll_pwait2_supported == 1) {
+                // We have epoll_pwait2(...) and it is supported, this means we can just pass in the itimerspec directly and not need an
+                // extra syscall even for very small timeouts.
+                struct timespec ts = { tvSec, tvNsec };
+                struct epoll_event *ev = (struct epoll_event*) (intptr_t) address;
+                int result, err;
+                do {
+                    result = epoll_pwait2(efd, ev, len, &ts, NULL);
+                    if (result >= 0) {
+                        return EPOLL_WAIT_RESULT(result, armTimer);
+                    }
+                } while((err = errno) == EINTR);
+                return EPOLL_WAIT_RESULT(-err, armTimer);
+            }
+
+            int millis = tvNsec / 1000000;
+            // Check if we can reduce the syscall overhead by just use epoll_wait. This is done in cases when we can
+            // tolerate some "drift".
+            if (tvNsec == 0 ||
+                    // Let's use the threshold to accept that we may be not 100 % accurate and ignore anything that
+                    // is smaller then 1 ms.
+                    millis >= millisThreshold ||
+                    tvSec > 0) {
+                millis += tvSec * 1000;
+                int result = netty_epoll_native_epollWait(env, clazz, efd, address, len, millis);
+                return EPOLL_WAIT_RESULT(result, armTimer);
+            }
+        }
+        struct itimerspec ts;
+        memset(&ts.it_interval, 0, sizeof(struct timespec));
+        ts.it_value.tv_sec = tvSec;
+        ts.it_value.tv_nsec = tvNsec;
+        if (timerfd_settime(timerFd, 0, &ts, NULL) < 0) {
+            netty_unix_errors_throwChannelExceptionErrorNo(env, "timerfd_settime() failed: ", errno);
+            return -1;
+        }
+        armTimer = 1;
+    }
+    int result = netty_epoll_native_epollWait(env, clazz, efd, address, len, -1);
+    return EPOLL_WAIT_RESULT(result, armTimer);
+}
+
+static inline void cpu_relax() {
+#if defined(__x86_64__)
+    asm volatile("pause\n": : :"memory");
+#elif defined(__aarch64__)
+    asm volatile("isb\n": : :"memory");
+#elif defined(__riscv) && defined(__riscv_zihintpause)
+    asm volatile("pause\n": : :"memory");
+#endif
+}
+
+static jint netty_epoll_native_epollBusyWait0(JNIEnv* env, jclass clazz, jint efd, jlong address, jint len) {
+    struct epoll_event *ev = (struct epoll_event*) (intptr_t) address;
+    int result, err;
+
+    // Zeros = poll (aka return immediately).
+    do {
+        result = epoll_wait(efd, ev, len, 0);
+        if (result == 0) {
+            // Since we're always polling epoll_wait with no timeout,
+            // signal CPU that we're in a busy loop
+            cpu_relax();
+        }
+
+        if (result >= 0) {
+            return result;
+        }
+    } while((err = errno) == EINTR);
+
+    return -err;
+}
+
+static jint netty_epoll_native_epollCtlAdd0(JNIEnv* env, jclass clazz, jint efd, jint fd, jint flags) {
+    int res = epollCtl(env, efd, EPOLL_CTL_ADD, fd, flags);
+    if (res < 0) {
+        return -errno;
+    }
+    return res;
+}
+static jint netty_epoll_native_epollCtlMod0(JNIEnv* env, jclass clazz, jint efd, jint fd, jint flags) {
+    int res = epollCtl(env, efd, EPOLL_CTL_MOD, fd, flags);
+    if (res < 0) {
+        return -errno;
+    }
+    return res;
+}
+
+static jint netty_epoll_native_epollCtlDel0(JNIEnv* env, jclass clazz, jint efd, jint fd) {
+    // Create an empty event to workaround a bug in older kernels which can not handle NULL.
+    struct epoll_event event = { 0 };
+    int res = epoll_ctl(efd, EPOLL_CTL_DEL, fd, &event);
+    if (res < 0) {
+        return -errno;
+    }
+    return res;
+}
+
+static jint netty_epoll_native_sendmmsg0(JNIEnv* env, jclass clazz, jint fd, jboolean ipv6, jobjectArray packets, jint offset, jint len) {
+    struct mmsghdr msg[len];
+    struct sockaddr_storage addr[len];
+    char controls[len][CMSG_SPACE(sizeof(uint16_t))];
+
+    socklen_t addrSize;
+    int i;
+
+    memset(msg, 0, sizeof(msg));
+
+    for (i = 0; i < len; i++) {
+        jobject packet = (*env)->GetObjectArrayElement(env, packets, i + offset);
+        jbyteArray address = (jbyteArray) (*env)->GetObjectField(env, packet, packetRecipientAddrFieldId);
+        jint addrLen = (*env)->GetIntField(env, packet, packetRecipientAddrLenFieldId);
+        jint packetSegmentSize = (*env)->GetIntField(env, packet, packetSegmentSizeFieldId);
+        if (packetSegmentSize > 0) {
+            msg[i].msg_hdr.msg_control = controls[i];
+            msg[i].msg_hdr.msg_controllen = sizeof(controls[i]);
+            struct cmsghdr *cm = CMSG_FIRSTHDR(&msg[i].msg_hdr);
+            cm->cmsg_level = SOL_UDP;
+            cm->cmsg_type = UDP_SEGMENT;
+            cm->cmsg_len = CMSG_LEN(sizeof(uint16_t));
+            *((uint16_t *) CMSG_DATA(cm)) = packetSegmentSize;
+        }
+        if (addrLen != 0) {
+            jint scopeId = (*env)->GetIntField(env, packet, packetRecipientScopeIdFieldId);
+            jint port = (*env)->GetIntField(env, packet, packetRecipientPortFieldId);
+
+           if (netty_unix_socket_initSockaddr(env, ipv6, address, scopeId, port, &addr[i], &addrSize) == -1) {
+              return -1;
+           }
+           msg[i].msg_hdr.msg_name = &addr[i];
+           msg[i].msg_hdr.msg_namelen = addrSize;
+        }
+
+        msg[i].msg_hdr.msg_iov = (struct iovec*) (intptr_t) (*env)->GetLongField(env, packet, packetMemoryAddressFieldId);
+        msg[i].msg_hdr.msg_iovlen = (*env)->GetIntField(env, packet, packetCountFieldId);
+    }
+
+    ssize_t res;
+    int err;
+    do {
+       // We directly use the syscall to prevent depending on GLIBC 2.14.
+       res = syscall(SYS_sendmmsg, fd, msg, len, 0);
+       // keep on writing if it was interrupted
+    } while (res == -1 && ((err = errno) == EINTR));
+
+    if (res < 0) {
+        return -err;
+    }
+    return (jint) res;
+}
+
+static void init_packet_address(JNIEnv* env, jobject packet, struct sockaddr_storage* addr, jfieldID addrFieldId,
+            jfieldID addrLenFieldId, jfieldID scopeIdFieldId, jfieldID portFieldId) {
+    jbyteArray address = (jbyteArray) (*env)->GetObjectField(env, packet, addrFieldId);
+
+    if (addr->ss_family == AF_INET) {
+        struct sockaddr_in* ipaddr = (struct sockaddr_in*) addr;
+
+        (*env)->SetByteArrayRegion(env, address, 0, 4, (jbyte*) &ipaddr->sin_addr.s_addr);
+        (*env)->SetIntField(env, packet, addrLenFieldId, 4);
+        (*env)->SetIntField(env, packet, scopeIdFieldId, 0);
+        (*env)->SetIntField(env, packet, portFieldId, ntohs(ipaddr->sin_port));
+    } else {
+        int addrLen = netty_unix_socket_ipAddressLength(addr);
+        struct sockaddr_in6* ip6addr = (struct sockaddr_in6*) addr;
+
+        if (addrLen == 4) {
+            // IPV4 mapped IPV6 address
+            jbyte* addr = (jbyte*) &ip6addr->sin6_addr.s6_addr;
+            (*env)->SetByteArrayRegion(env, address, 0, 4, addr + 12);
+        } else {
+            (*env)->SetByteArrayRegion(env, address, 0, 16, (jbyte*) &ip6addr->sin6_addr.s6_addr);
+        }
+        (*env)->SetIntField(env, packet, addrLenFieldId, addrLen);
+        (*env)->SetIntField(env, packet, scopeIdFieldId, ip6addr->sin6_scope_id);
+        (*env)->SetIntField(env, packet, portFieldId, ntohs(ip6addr->sin6_port));
+    }
+}
+
+static void init_packet(JNIEnv* env, jobject packet, struct msghdr* msg, int len) {
+    (*env)->SetIntField(env, packet, packetCountFieldId, len);
+
+    init_packet_address(env, packet, (struct sockaddr_storage*) msg->msg_name, packetSenderAddrFieldId, packetSenderAddrLenFieldId, packetSenderScopeIdFieldId, packetSenderPortFieldId);
+
+    struct cmsghdr *cmsg = NULL;
+    uint16_t gso_size = 0;
+    uint16_t *gsosizeptr = NULL;
+    for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg)) {
+       if (cmsg->cmsg_level == SOL_UDP && cmsg->cmsg_type == UDP_GRO) {
+           gsosizeptr = (uint16_t *) CMSG_DATA(cmsg);
+           gso_size = *gsosizeptr;
+       }
+#ifdef IP_RECVORIGDSTADDR
+       else if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_RECVORIGDSTADDR) {
+           init_packet_address(env, packet, (struct sockaddr_storage*) CMSG_DATA(cmsg), packetRecipientAddrFieldId, packetRecipientAddrLenFieldId, packetRecipientScopeIdFieldId, packetRecipientPortFieldId);
+       }
+#endif // IP_RECVORIGDSTADDR
+    }
+    (*env)->SetIntField(env, packet, packetSegmentSizeFieldId, gso_size);
+}
+
+static jint netty_epoll_native_recvmsg0(JNIEnv* env, jclass clazz, jint fd, jboolean ipv6, jobject packet) {
+    struct msghdr msg = { 0 };
+    struct sockaddr_storage sock_address;
+    int addrSize = sizeof(sock_address);
+    // Enough space for GRO and IP_RECVORIGDSTADDR
+    char control[CMSG_SPACE(sizeof(uint16_t)) + sizeof(struct sockaddr_storage)] = { 0 };
+    msg.msg_name = &sock_address;
+    msg.msg_namelen = (socklen_t) addrSize;
+    msg.msg_iov = (struct iovec*) (intptr_t) (*env)->GetLongField(env, packet, packetMemoryAddressFieldId);
+    msg.msg_iovlen = (*env)->GetIntField(env, packet, packetCountFieldId);
+    msg.msg_control = control;
+    msg.msg_controllen = sizeof(control);
+    ssize_t res;
+    int err;
+    do {
+        res = recvmsg(fd, &msg, 0);
+        // keep on reading if it was interrupted
+    } while (res == -1 && ((err = errno) == EINTR));
+    if (res < 0) {
+        return -err;
+    }
+    init_packet(env, packet, &msg, res);
+    return (jint) res;
+}
+
+static jint netty_epoll_native_recvmmsg0(JNIEnv* env, jclass clazz, jint fd, jboolean ipv6, jobjectArray packets, jint offset, jint len) {
+    struct mmsghdr msg[len];
+    memset(msg, 0, sizeof(msg));
+    struct sockaddr_storage addr[len];
+    int addrSize = sizeof(addr);
+    memset(addr, 0, addrSize);
+    int storageSize = sizeof(struct sockaddr_storage);
+    char* cntrlbuf = NULL;
+
+#ifdef IP_RECVORIGDSTADDR
+    int readLocalAddr = 0;
+    if (netty_unix_socket_getOption(env, fd, IPPROTO_IP, IP_RECVORIGDSTADDR,
+            &readLocalAddr, sizeof(readLocalAddr)) < 0) {
+        cntrlbuf = malloc(sizeof(char) * storageSize * len);
+    }
+#endif // IP_RECVORIGDSTADDR
+
+    int i;
+
+    for (i = 0; i < len; i++) {
+        jobject packet = (*env)->GetObjectArrayElement(env, packets, i + offset);
+        msg[i].msg_hdr.msg_iov = (struct iovec*) (intptr_t) (*env)->GetLongField(env, packet, packetMemoryAddressFieldId);
+        msg[i].msg_hdr.msg_iovlen = (*env)->GetIntField(env, packet, packetCountFieldId);
+
+        msg[i].msg_hdr.msg_name = addr + i;
+        msg[i].msg_hdr.msg_namelen = (socklen_t) addrSize;
+
+        if (cntrlbuf != NULL) {
+            msg[i].msg_hdr.msg_control =  cntrlbuf + i * storageSize;
+            msg[i].msg_hdr.msg_controllen = storageSize;
+        }
+    }
+
+    ssize_t res;
+    int err;
+    do {
+        // We directly use the syscall to prevent depending on GLIBC 2.12.
+        res = syscall(SYS_recvmmsg, fd, &msg, len, 0, NULL);
+
+        // keep on reading if it was interrupted
+    } while (res == -1 && ((err = errno) == EINTR));
+
+    if (res >= 0) {
+        for (i = 0; i < res; i++) {
+            jobject packet = (*env)->GetObjectArrayElement(env, packets, i + offset);
+            init_packet(env, packet, &msg[i].msg_hdr, msg[i].msg_len);
+        }
+    }
+    // Free the control message buffer if needed.
+    free(cntrlbuf);
+
+    if (res < 0) {
+        return -err;
+    }
+    return (jint) res;
+}
+
+static jstring netty_epoll_native_kernelVersion(JNIEnv* env, jclass clazz) {
+    struct utsname name;
+
+    int res = uname(&name);
+    if (res == 0) {
+        return (*env)->NewStringUTF(env, name.release);
+    }
+    netty_unix_errors_throwRuntimeExceptionErrorNo(env, "uname() failed: ", errno);
+    return NULL;
+}
+
+static jboolean netty_epoll_native_isSupportingSendmmsg(JNIEnv* env, jclass clazz) {
+    if (SYS_sendmmsg == -1) {
+        return JNI_FALSE;
+    }
+    if (syscall(SYS_sendmmsg, -1, NULL, 0, 0) == -1) {
+        if (errno == ENOSYS) {
+            return JNI_FALSE;
+        }
+    }
+    return JNI_TRUE;
+}
+
+static jboolean netty_epoll_native_isSupportingUdpSegment(JNIEnv* env, jclass clazz) {
+    int fd = socket(AF_INET, SOCK_DGRAM, 0);
+    if (fd == -1) {
+        return JNI_FALSE;
+    }
+    int gso_size = 512;
+    int ret = setsockopt(fd, SOL_UDP, UDP_SEGMENT, &gso_size, sizeof(gso_size));
+    close(fd);
+    return ret == -1 ? JNI_FALSE : JNI_TRUE;
+}
+
+static jboolean netty_epoll_native_isSupportingRecvmmsg(JNIEnv* env, jclass clazz) {
+    if (SYS_recvmmsg == -1) {
+        return JNI_FALSE;
+    }
+    if (syscall(SYS_recvmmsg, -1, NULL, 0, 0, NULL) == -1) {
+        if (errno == ENOSYS) {
+            return JNI_FALSE;
+        }
+    }
+    return JNI_TRUE;
+}
+
+static jint netty_epoll_native_tcpFastopenMode(JNIEnv* env, jclass clazz) {
+    int fastopen = 0;
+    getSysctlValue("/proc/sys/net/ipv4/tcp_fastopen", &fastopen);
+    return fastopen;
+}
+
+static jint netty_epoll_native_epollet(JNIEnv* env, jclass clazz) {
+    return EPOLLET;
+}
+
+static jint netty_epoll_native_epollin(JNIEnv* env, jclass clazz) {
+    return EPOLLIN;
+}
+
+static jint netty_epoll_native_epollout(JNIEnv* env, jclass clazz) {
+    return EPOLLOUT;
+}
+
+static jint netty_epoll_native_epollrdhup(JNIEnv* env, jclass clazz) {
+    return EPOLLRDHUP;
+}
+
+static jint netty_epoll_native_epollerr(JNIEnv* env, jclass clazz) {
+    return EPOLLERR;
+}
+
+static jint netty_epoll_native_sizeofEpollEvent(JNIEnv* env, jclass clazz) {
+    return sizeof(struct epoll_event);
+}
+
+static jint netty_epoll_native_offsetofEpollData(JNIEnv* env, jclass clazz) {
+    return offsetof(struct epoll_event, data);
+}
+
+static jint netty_epoll_native_splice0(JNIEnv* env, jclass clazz, jint fd, jlong offIn, jint fdOut, jlong offOut, jlong len) {
+    ssize_t res;
+    int err;
+    loff_t off_in = (loff_t) offIn;
+    loff_t off_out = (loff_t) offOut;
+
+    loff_t* p_off_in = off_in >= 0 ? &off_in : NULL;
+    loff_t* p_off_out = off_out >= 0 ? &off_out : NULL;
+
+    do {
+       res = splice(fd, p_off_in, fdOut, p_off_out, (size_t) len, SPLICE_F_NONBLOCK | SPLICE_F_MOVE);
+       // keep on splicing if it was interrupted
+    } while (res == -1 && ((err = errno) == EINTR));
+
+    if (res < 0) {
+        return -err;
+    }
+    return (jint) res;
+}
+
+static jint netty_epoll_native_tcpMd5SigMaxKeyLen(JNIEnv* env, jclass clazz) {
+    struct tcp_md5sig md5sig;
+
+    // Defensive size check
+    if (sizeof(md5sig.tcpm_key) < TCP_MD5SIG_MAXKEYLEN) {
+        return sizeof(md5sig.tcpm_key);
+    }
+
+    return TCP_MD5SIG_MAXKEYLEN;
+}
+
+static jint netty_epoll_native_registerUnix(JNIEnv* env, jclass clazz) {
+    register_unix_called = 1;
+    return netty_unix_register(env, staticPackagePrefix);
+}
+
+// JNI Registered Methods End
+
+// JNI Method Registration Table Begin
+static const JNINativeMethod statically_referenced_fixed_method_table[] = {
+  { "epollet", "()I", (void *) netty_epoll_native_epollet },
+  { "epollin", "()I", (void *) netty_epoll_native_epollin },
+  { "epollout", "()I", (void *) netty_epoll_native_epollout },
+  { "epollrdhup", "()I", (void *) netty_epoll_native_epollrdhup },
+  { "epollerr", "()I", (void *) netty_epoll_native_epollerr },
+  { "tcpMd5SigMaxKeyLen", "()I", (void *) netty_epoll_native_tcpMd5SigMaxKeyLen },
+  { "isSupportingSendmmsg", "()Z", (void *) netty_epoll_native_isSupportingSendmmsg },
+  { "isSupportingRecvmmsg", "()Z", (void *) netty_epoll_native_isSupportingRecvmmsg },
+  { "tcpFastopenMode", "()I", (void *) netty_epoll_native_tcpFastopenMode },
+  { "kernelVersion", "()Ljava/lang/String;", (void *) netty_epoll_native_kernelVersion }
+};
+static const jint statically_referenced_fixed_method_table_size = sizeof(statically_referenced_fixed_method_table) / sizeof(statically_referenced_fixed_method_table[0]);
+static const JNINativeMethod fixed_method_table[] = {
+  { "eventFd", "()I", (void *) netty_epoll_native_eventFd },
+  { "timerFd", "()I", (void *) netty_epoll_native_timerFd },
+  { "eventFdWrite", "(IJ)V", (void *) netty_epoll_native_eventFdWrite },
+  { "eventFdRead", "(I)V", (void *) netty_epoll_native_eventFdRead },
+  { "epollCreate", "()I", (void *) netty_epoll_native_epollCreate },
+  { "epollWait0", "(IJIIIIJ)J", (void *) netty_epoll_native_epollWait0 },
+  { "epollWait", "(IJII)I", (void *) netty_epoll_native_epollWait },
+  { "epollBusyWait0", "(IJI)I", (void *) netty_epoll_native_epollBusyWait0 },
+  { "epollCtlAdd0", "(III)I", (void *) netty_epoll_native_epollCtlAdd0 },
+  { "epollCtlMod0", "(III)I", (void *) netty_epoll_native_epollCtlMod0 },
+  { "epollCtlDel0", "(II)I", (void *) netty_epoll_native_epollCtlDel0 },
+  // "sendmmsg0" has a dynamic signature
+  { "sizeofEpollEvent", "()I", (void *) netty_epoll_native_sizeofEpollEvent },
+  { "offsetofEpollData", "()I", (void *) netty_epoll_native_offsetofEpollData },
+  { "splice0", "(IJIJJ)I", (void *) netty_epoll_native_splice0 },
+  { "isSupportingUdpSegment", "()Z", (void *) netty_epoll_native_isSupportingUdpSegment },
+  { "registerUnix", "()I", (void *) netty_epoll_native_registerUnix },
+
+};
+static const jint fixed_method_table_size = sizeof(fixed_method_table) / sizeof(fixed_method_table[0]);
+
+static jint dynamicMethodsTableSize() {
+    return fixed_method_table_size + 3; // 3 is for the dynamic method signatures.
+}
+
+static JNINativeMethod* createDynamicMethodsTable(const char* packagePrefix) {
+    char* dynamicTypeName = NULL;
+    size_t size = sizeof(JNINativeMethod) * dynamicMethodsTableSize();
+    JNINativeMethod* dynamicMethods = malloc(size);
+    if (dynamicMethods == NULL) {
+        return NULL;
+    }
+    memset(dynamicMethods, 0, size);
+    memcpy(dynamicMethods, fixed_method_table, sizeof(fixed_method_table));
+    
+    JNINativeMethod* dynamicMethod = &dynamicMethods[fixed_method_table_size];
+    NETTY_JNI_UTIL_PREPEND(packagePrefix, "io/netty/channel/epoll/NativeDatagramPacketArray$NativeDatagramPacket;II)I", dynamicTypeName, error);
+    NETTY_JNI_UTIL_PREPEND("(IZ[L", dynamicTypeName,  dynamicMethod->signature, error);
+    dynamicMethod->name = "sendmmsg0";
+    dynamicMethod->fnPtr = (void *) netty_epoll_native_sendmmsg0;
+    netty_jni_util_free_dynamic_name(&dynamicTypeName);
+
+    ++dynamicMethod;
+    NETTY_JNI_UTIL_PREPEND(packagePrefix, "io/netty/channel/epoll/NativeDatagramPacketArray$NativeDatagramPacket;II)I", dynamicTypeName, error);
+    NETTY_JNI_UTIL_PREPEND("(IZ[L", dynamicTypeName,  dynamicMethod->signature, error);
+    dynamicMethod->name = "recvmmsg0";
+    dynamicMethod->fnPtr = (void *) netty_epoll_native_recvmmsg0;
+    netty_jni_util_free_dynamic_name(&dynamicTypeName);
+
+    ++dynamicMethod;
+    NETTY_JNI_UTIL_PREPEND(packagePrefix, "io/netty/channel/epoll/NativeDatagramPacketArray$NativeDatagramPacket;)I", dynamicTypeName, error);
+    NETTY_JNI_UTIL_PREPEND("(IZL", dynamicTypeName,  dynamicMethod->signature, error);
+    dynamicMethod->name = "recvmsg0";
+    dynamicMethod->fnPtr = (void *) netty_epoll_native_recvmsg0;
+    netty_jni_util_free_dynamic_name(&dynamicTypeName);
+
+    return dynamicMethods;
+error:
+    free(dynamicTypeName);
+    netty_jni_util_free_dynamic_methods_table(dynamicMethods, fixed_method_table_size, dynamicMethodsTableSize());
+    return NULL;
+}
+
+// JNI Method Registration Table End
+
+// IMPORTANT: If you add any NETTY_JNI_UTIL_LOAD_CLASS or NETTY_JNI_UTIL_FIND_CLASS calls you also need to update
+//            Native to reflect that.
+static jint netty_epoll_native_JNI_OnLoad(JNIEnv* env, const char* packagePrefix) {
+    int ret = JNI_ERR;
+    int staticallyRegistered = 0;
+    int nativeRegistered = 0;
+    int linuxsocketOnLoadCalled = 0;
+    char* nettyClassName = NULL;
+    jclass nativeDatagramPacketCls = NULL;
+    JNINativeMethod* dynamicMethods = NULL;
+
+    // We must register the statically referenced methods first!
+    if (netty_jni_util_register_natives(env,
+            packagePrefix,
+            STATICALLY_CLASSNAME,
+            statically_referenced_fixed_method_table,
+            statically_referenced_fixed_method_table_size) != 0) {
+        goto done;
+    }
+    staticallyRegistered = 1;
+
+    // Register the methods which are not referenced by static member variables
+    dynamicMethods = createDynamicMethodsTable(packagePrefix);
+    if (dynamicMethods == NULL) {
+        goto done;
+    }
+
+    if (netty_jni_util_register_natives(env,
+            packagePrefix,
+            NATIVE_CLASSNAME,
+            dynamicMethods,
+            dynamicMethodsTableSize()) != 0) {
+        goto done;
+    }
+    nativeRegistered = 1;
+
+    if (netty_epoll_linuxsocket_JNI_OnLoad(env, packagePrefix) == JNI_ERR) {
+        goto done;
+    }
+    linuxsocketOnLoadCalled = 1;
+
+    // Initialize this module
+    NETTY_JNI_UTIL_PREPEND(packagePrefix, "io/netty/channel/epoll/NativeDatagramPacketArray$NativeDatagramPacket", nettyClassName, done);
+    NETTY_JNI_UTIL_FIND_CLASS(env, nativeDatagramPacketCls, nettyClassName, done);
+    netty_jni_util_free_dynamic_name(&nettyClassName);
+
+    NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetSenderAddrFieldId, "senderAddr", "[B", done);
+    NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetSenderAddrLenFieldId, "senderAddrLen", "I", done);
+    NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetSenderScopeIdFieldId, "senderScopeId", "I", done);
+    NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetSenderPortFieldId, "senderPort", "I", done);
+    NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetRecipientAddrFieldId, "recipientAddr", "[B", done);
+    NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetRecipientAddrLenFieldId, "recipientAddrLen", "I", done);
+    NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetRecipientScopeIdFieldId, "recipientScopeId", "I", done);
+    NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetRecipientPortFieldId, "recipientPort", "I", done);
+    NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetSegmentSizeFieldId, "segmentSize", "I", done);
+    NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetMemoryAddressFieldId, "memoryAddress", "J", done);
+    NETTY_JNI_UTIL_GET_FIELD(env, nativeDatagramPacketCls, packetCountFieldId, "count", "I", done);
+
+    ret = NETTY_JNI_UTIL_JNI_VERSION;
+
+    staticPackagePrefix = packagePrefix;
+
+    // Check if there is an epoll_pwait2 system call and also if it works. One some systems it might be there
+    // but actually is not implemented and so fail with ENOSYS.
+    // See https://github.com/netty/netty/issues/12343
+    if (epoll_pwait2) {
+        int efd = epoll_create(1);
+        if (efd != -1) {
+            struct timespec ts = { 0, 0 };
+            struct epoll_event ev;
+            do {
+                if (epoll_pwait2(efd, &ev, 1, &ts, NULL) != -1) {
+                    epoll_pwait2_supported = 1;
+                    break;
+                }
+            } while(errno == EINTR);
+            close(efd);
+        }
+    }
+done:
+
+    netty_jni_util_free_dynamic_methods_table(dynamicMethods, fixed_method_table_size, dynamicMethodsTableSize());
+    free(nettyClassName);
+
+    if (ret == JNI_ERR) {
+        if (staticallyRegistered == 1) {
+            netty_jni_util_unregister_natives(env, packagePrefix, STATICALLY_CLASSNAME);
+        }
+        if (nativeRegistered == 1) {
+            netty_jni_util_unregister_natives(env, packagePrefix, NATIVE_CLASSNAME);
+        }
+        if (linuxsocketOnLoadCalled == 1) {
+            netty_epoll_linuxsocket_JNI_OnUnLoad(env, packagePrefix);
+        }
+        packetSenderAddrFieldId = NULL;
+        packetSenderAddrLenFieldId = NULL;
+        packetSenderScopeIdFieldId = NULL;
+        packetSenderPortFieldId = NULL;
+        packetRecipientAddrFieldId = NULL;
+        packetRecipientAddrLenFieldId = NULL;
+        packetRecipientScopeIdFieldId = NULL;
+        packetRecipientPortFieldId = NULL;
+        packetSegmentSizeFieldId = NULL;
+        packetMemoryAddressFieldId = NULL;
+        packetCountFieldId = NULL;
+    }
+    return ret;
+}
+
+static void netty_epoll_native_JNI_OnUnload(JNIEnv* env) {
+    netty_epoll_linuxsocket_JNI_OnUnLoad(env, staticPackagePrefix);
+
+    if (register_unix_called == 1) {
+        register_unix_called = 0;
+        netty_unix_unregister(env, staticPackagePrefix);
+    }
+
+    netty_jni_util_unregister_natives(env, staticPackagePrefix, STATICALLY_CLASSNAME);
+    netty_jni_util_unregister_natives(env, staticPackagePrefix, NATIVE_CLASSNAME);
+
+    if (staticPackagePrefix != NULL) {
+        free((void *) staticPackagePrefix);
+        staticPackagePrefix = NULL;
+    }
+
+    packetSenderAddrFieldId = NULL;
+    packetSenderAddrLenFieldId = NULL;
+    packetSenderScopeIdFieldId = NULL;
+    packetSenderPortFieldId = NULL;
+    packetRecipientAddrFieldId = NULL;
+    packetRecipientAddrLenFieldId = NULL;
+    packetRecipientScopeIdFieldId = NULL;
+    packetRecipientPortFieldId = NULL;
+    packetSegmentSizeFieldId = NULL;
+    packetMemoryAddressFieldId = NULL;
+    packetCountFieldId = NULL;
+}
+
+// Invoked by the JVM when statically linked
+
+// We build with -fvisibility=hidden so ensure we mark everything that needs to be visible with JNIEXPORT
+// https://mail.openjdk.java.net/pipermail/core-libs-dev/2013-February/014549.html
+
+// Invoked by the JVM when statically linked
+JNIEXPORT jint JNI_OnLoad_netty_transport_native_epoll(JavaVM* vm, void* reserved) {
+    return netty_jni_util_JNI_OnLoad(vm, reserved, "netty_transport_native_epoll", netty_epoll_native_JNI_OnLoad);
+}
+
+// Invoked by the JVM when statically linked
+JNIEXPORT void JNI_OnUnload_netty_transport_native_epoll(JavaVM* vm, void* reserved) {
+    netty_jni_util_JNI_OnUnload(vm, reserved, netty_epoll_native_JNI_OnUnload);
+}
+
+#ifndef NETTY_BUILD_STATIC
+JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
+    return netty_jni_util_JNI_OnLoad(vm, reserved, "netty_transport_native_epoll", netty_epoll_native_JNI_OnLoad);
+}
+
+JNIEXPORT void JNI_OnUnload(JavaVM* vm, void* reserved) {
+    netty_jni_util_JNI_OnUnload(vm, reserved, netty_epoll_native_JNI_OnUnload);
+}
+#endif /* NETTY_BUILD_STATIC */

netty-channel-epoll-native/src/main/c/netty_epoll_vmsocket.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2023 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+#ifndef NETTY_EPOLL_VMSOCKET_H_
+#define NETTY_EPOLL_VMSOCKET_H_
+
+#include <sys/socket.h>
+
+#ifndef AF_VSOCK
+#define AF_VSOCK 40
+#endif
+
+struct sockaddr_vm {
+    sa_family_t svm_family;
+    unsigned short svm_reserved1;
+    unsigned int svm_port;
+    unsigned int svm_cid;
+    unsigned char svm_zero[sizeof(struct sockaddr) -
+                           sizeof(sa_family_t) -
+                           sizeof(unsigned short) -
+                           sizeof(unsigned int) -
+                           sizeof(unsigned int)];
+};
+
+#endif /* NETTY_EPOLL_VMSOCKET_H_ */

netty-channel-epoll/build.gradle

@@ -1,4 +1,12 @@
+apply plugin: 'com.google.osdetector'
+
 dependencies {
     api project(':netty-channel')
     api project(':netty-channel-unix')
+    testImplementation project(':netty-testsuite')
+    testImplementation project(':netty-handler')
+    testImplementation testLibs.assertj
+    testImplementation testLibs.rerunner.jupiter
+    testRuntimeOnly project(path: ':netty-channel-epoll-native', configuration: osdetector.classifier)
+    testRuntimeOnly project(path: ':netty-tcnative-boringssl-static-native', configuration: osdetector.classifier)
 }

netty-channel-epoll/src/test/java/io/netty/channel/epoll/DetectPeerCloseWithoutReadTest.java

@@ -0,0 +1,212 @@
+/*
+ * Copyright 2017 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.channel.ChannelInitializer;
+import io.netty.channel.ChannelOption;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.FixedRecvByteBufAllocator;
+import io.netty.channel.ServerChannel;
+import io.netty.channel.SimpleChannelInboundHandler;
+import java.net.InetSocketAddress;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Timeout;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public abstract class DetectPeerCloseWithoutReadTest {
+    protected abstract EventLoopGroup newGroup();
+    protected abstract Class<? extends ServerChannel> serverChannel();
+    protected abstract Class<? extends Channel> clientChannel();
+
+    @Test
+    @Timeout(value = 10000, unit = TimeUnit.MILLISECONDS)
+    public void clientCloseWithoutServerReadIsDetectedNoExtraReadRequested() throws InterruptedException {
+        clientCloseWithoutServerReadIsDetected0(false);
+    }
+
+    @Test
+    @Timeout(value = 10000, unit = TimeUnit.MILLISECONDS)
+    public void clientCloseWithoutServerReadIsDetectedExtraReadRequested() throws InterruptedException {
+        clientCloseWithoutServerReadIsDetected0(true);
+    }
+
+    private void clientCloseWithoutServerReadIsDetected0(final boolean extraReadRequested)
+            throws InterruptedException {
+        EventLoopGroup serverGroup = null;
+        EventLoopGroup clientGroup = null;
+        Channel serverChannel = null;
+        try {
+            final CountDownLatch latch = new CountDownLatch(1);
+            final AtomicInteger bytesRead = new AtomicInteger();
+            final int expectedBytes = 100;
+            serverGroup = newGroup();
+            clientGroup = newGroup();
+            ServerBootstrap sb = new ServerBootstrap();
+            sb.group(serverGroup);
+            sb.channel(serverChannel());
+            // Ensure we read only one message per read() call and that we need multiple read()
+            // calls to consume everything.
+            sb.childOption(ChannelOption.AUTO_READ, false);
+            sb.childOption(ChannelOption.MAX_MESSAGES_PER_READ, 1);
+            sb.childOption(ChannelOption.RCVBUF_ALLOCATOR, new FixedRecvByteBufAllocator(expectedBytes / 10));
+            sb.childHandler(new ChannelInitializer<Channel>() {
+                @Override
+                protected void initChannel(Channel ch) {
+                    ch.pipeline().addLast(new TestHandler(bytesRead, extraReadRequested, latch));
+                }
+            });
+
+            serverChannel = sb.bind(new InetSocketAddress(0)).syncUninterruptibly().channel();
+
+            Bootstrap cb = new Bootstrap();
+            cb.group(serverGroup);
+            cb.channel(clientChannel());
+            cb.handler(new ChannelInboundHandlerAdapter());
+            Channel clientChannel = cb.connect(serverChannel.localAddress()).syncUninterruptibly().channel();
+            ByteBuf buf = clientChannel.alloc().buffer(expectedBytes);
+            buf.writerIndex(buf.writerIndex() + expectedBytes);
+            clientChannel.writeAndFlush(buf).addListener(ChannelFutureListener.CLOSE);
+
+            latch.await();
+            assertEquals(expectedBytes, bytesRead.get());
+        } finally {
+            if (serverChannel != null) {
+                serverChannel.close().syncUninterruptibly();
+            }
+            if (serverGroup != null) {
+                serverGroup.shutdownGracefully();
+            }
+            if (clientGroup != null) {
+                clientGroup.shutdownGracefully();
+            }
+        }
+    }
+
+    @Test
+    @Timeout(value = 10000, unit = TimeUnit.MILLISECONDS)
+    public void serverCloseWithoutClientReadIsDetectedNoExtraReadRequested() throws InterruptedException {
+        serverCloseWithoutClientReadIsDetected0(false);
+    }
+
+    @Test
+    @Timeout(value = 10000, unit = TimeUnit.MILLISECONDS)
+    public void serverCloseWithoutClientReadIsDetectedExtraReadRequested() throws InterruptedException {
+        serverCloseWithoutClientReadIsDetected0(true);
+    }
+
+    private void serverCloseWithoutClientReadIsDetected0(final boolean extraReadRequested) throws InterruptedException {
+        EventLoopGroup serverGroup = null;
+        EventLoopGroup clientGroup = null;
+        Channel serverChannel = null;
+        Channel clientChannel = null;
+        try {
+            final CountDownLatch latch = new CountDownLatch(1);
+            final AtomicInteger bytesRead = new AtomicInteger();
+            final int expectedBytes = 100;
+            serverGroup = newGroup();
+            clientGroup = newGroup();
+            ServerBootstrap sb = new ServerBootstrap();
+            sb.group(serverGroup);
+            sb.channel(serverChannel());
+            sb.childHandler(new ChannelInitializer<Channel>() {
+                @Override
+                protected void initChannel(Channel ch) {
+                    ch.pipeline().addLast(new ChannelInboundHandlerAdapter() {
+                        @Override
+                        public void channelActive(ChannelHandlerContext ctx) {
+                            ByteBuf buf = ctx.alloc().buffer(expectedBytes);
+                            buf.writerIndex(buf.writerIndex() + expectedBytes);
+                            ctx.writeAndFlush(buf).addListener(ChannelFutureListener.CLOSE);
+                            ctx.fireChannelActive();
+                        }
+                    });
+                }
+            });
+
+            serverChannel = sb.bind(new InetSocketAddress(0)).syncUninterruptibly().channel();
+
+            Bootstrap cb = new Bootstrap();
+            cb.group(serverGroup);
+            cb.channel(clientChannel());
+            // Ensure we read only one message per read() call and that we need multiple read()
+            // calls to consume everything.
+            cb.option(ChannelOption.AUTO_READ, false);
+            cb.option(ChannelOption.MAX_MESSAGES_PER_READ, 1);
+            cb.option(ChannelOption.RCVBUF_ALLOCATOR, new FixedRecvByteBufAllocator(expectedBytes / 10));
+            cb.handler(new ChannelInitializer<Channel>() {
+                @Override
+                protected void initChannel(Channel ch) throws Exception {
+                    ch.pipeline().addLast(new TestHandler(bytesRead, extraReadRequested, latch));
+                }
+            });
+            clientChannel = cb.connect(serverChannel.localAddress()).syncUninterruptibly().channel();
+
+            latch.await();
+            assertEquals(expectedBytes, bytesRead.get());
+        } finally {
+            if (serverChannel != null) {
+                serverChannel.close().syncUninterruptibly();
+            }
+            if (clientChannel != null) {
+                clientChannel.close().syncUninterruptibly();
+            }
+            if (serverGroup != null) {
+                serverGroup.shutdownGracefully();
+            }
+            if (clientGroup != null) {
+                clientGroup.shutdownGracefully();
+            }
+        }
+    }
+
+    private static final class TestHandler extends SimpleChannelInboundHandler<ByteBuf> {
+        private final AtomicInteger bytesRead;
+        private final boolean extraReadRequested;
+        private final CountDownLatch latch;
+
+        TestHandler(AtomicInteger bytesRead, boolean extraReadRequested, CountDownLatch latch) {
+            this.bytesRead = bytesRead;
+            this.extraReadRequested = extraReadRequested;
+            this.latch = latch;
+        }
+
+        @Override
+        protected void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) {
+            bytesRead.addAndGet(msg.readableBytes());
+
+            if (extraReadRequested) {
+                // Because autoread is off, we call read to consume all data until we detect the close.
+                ctx.read();
+            }
+        }
+
+        @Override
+        public void channelInactive(ChannelHandlerContext ctx) {
+            latch.countDown();
+            ctx.fireChannelInactive();
+        }
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollAbstractDomainSocketEchoTest.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.channel.unix.DomainSocketAddress;
+import java.net.SocketAddress;
+import java.util.UUID;
+
+public class EpollAbstractDomainSocketEchoTest extends EpollDomainSocketEchoTest {
+    @Override
+    protected SocketAddress newSocketAddress() {
+        // these don't actually show up in the file system so creating a temp file isn't reliable
+        return new DomainSocketAddress("\0" + System.getProperty("java.io.tmpdir") + UUID.randomUUID());
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollChannelConfigTest.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.channel.ChannelException;
+
+import io.netty.channel.unix.Buffer;
+import io.netty.channel.unix.IntegerUnixChannelOption;
+import io.netty.channel.unix.RawUnixChannelOption;
+import org.junit.jupiter.api.Test;
+
+import java.nio.ByteBuffer;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+
+public class EpollChannelConfigTest {
+
+    @Test
+    public void testOptionGetThrowsChannelException() throws Exception {
+        Epoll.ensureAvailability();
+        EpollSocketChannel channel = new EpollSocketChannel();
+        channel.config().getSoLinger();
+        channel.fd().close();
+        try {
+            channel.config().getSoLinger();
+            fail();
+        } catch (ChannelException e) {
+            // expected
+        }
+    }
+
+    @Test
+    public void testOptionSetThrowsChannelException() throws Exception {
+        Epoll.ensureAvailability();
+        EpollSocketChannel channel = new EpollSocketChannel();
+        channel.config().setKeepAlive(true);
+        channel.fd().close();
+        try {
+            channel.config().setKeepAlive(true);
+            fail();
+        } catch (ChannelException e) {
+            // expected
+        }
+    }
+
+    @Test
+    public void testIntegerOption() throws Exception {
+        Epoll.ensureAvailability();
+        EpollSocketChannel channel = new EpollSocketChannel();
+        IntegerUnixChannelOption opt = new IntegerUnixChannelOption("INT_OPT", 1, 2);
+        Integer zero = 0;
+        assertEquals(zero, channel.config().getOption(opt));
+        channel.config().setOption(opt, 1);
+        assertNotEquals(zero, channel.config().getOption(opt));
+        channel.fd().close();
+    }
+
+    @Test
+    public void testRawOption() throws Exception {
+        Epoll.ensureAvailability();
+        EpollSocketChannel channel = new EpollSocketChannel();
+        // Value for SOL_SOCKET and SO_REUSEADDR
+        // See https://github.com/torvalds/linux/blob/v5.17/include/uapi/asm-generic/socket.h
+        RawUnixChannelOption opt = new RawUnixChannelOption("RAW_OPT", 1, 2, 4);
+
+        ByteBuffer disabled = Buffer.allocateDirectWithNativeOrder(4);
+        disabled.putInt(0).flip();
+        assertEquals(disabled, channel.config().getOption(opt));
+
+        ByteBuffer enabled = Buffer.allocateDirectWithNativeOrder(4);
+        enabled.putInt(1).flip();
+
+        channel.config().setOption(opt, enabled);
+        assertNotEquals(disabled, channel.config().getOption(opt));
+        channel.fd().close();
+    }
+}
+

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollCompositeBufferGatheringWriteTest.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2017 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.ChannelConfig;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.CompositeBufferGatheringWriteTest;
+
+import java.util.List;
+
+public class EpollCompositeBufferGatheringWriteTest extends CompositeBufferGatheringWriteTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithoutFastOpen();
+    }
+
+    @Override
+    protected void compositeBufferPartialWriteDoesNotCorruptDataInitServerConfig(ChannelConfig config,
+                                                                                 int soSndBuf) {
+        if (config instanceof EpollChannelConfig) {
+            ((EpollChannelConfig) config).setMaxBytesPerGatheringWrite(soSndBuf);
+        }
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDatagramChannelConfigTest.java

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2019 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class EpollDatagramChannelConfigTest {
+
+    @Test
+    public void testIpFreeBind() throws Exception {
+        Epoll.ensureAvailability();
+        EpollDatagramChannel channel = new EpollDatagramChannel();
+        assertTrue(channel.config().setOption(EpollChannelOption.IP_FREEBIND, true));
+        assertTrue(channel.config().getOption(EpollChannelOption.IP_FREEBIND));
+        channel.fd().close();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDatagramChannelTest.java

@@ -0,0 +1,115 @@
+/*
+ * Copyright 2019 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.socket.InternetProtocolFamily;
+import io.netty.channel.unix.Socket;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
+
+import static io.netty.util.NetUtil.LOCALHOST;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class EpollDatagramChannelTest {
+
+    @BeforeEach
+    public void setUp() {
+        Epoll.ensureAvailability();
+    }
+
+    @Test
+    public void testDefaultMaxMessagePerRead() {
+        EpollDatagramChannel channel = new EpollDatagramChannel();
+        assertEquals(16, channel.config().getMaxMessagesPerRead());
+        channel.unsafe().closeForcibly();
+    }
+
+    @Test
+    public void testNotActiveNoLocalRemoteAddress() throws IOException {
+        checkNotActiveNoLocalRemoteAddress(new EpollDatagramChannel());
+        checkNotActiveNoLocalRemoteAddress(new EpollDatagramChannel(InternetProtocolFamily.IPv4));
+        checkNotActiveNoLocalRemoteAddress(new EpollDatagramChannel(InternetProtocolFamily.IPv6));
+    }
+
+    @Test
+    public void testActiveHasLocalAddress() throws IOException {
+        Socket socket = Socket.newSocketDgram();
+        EpollDatagramChannel channel = new EpollDatagramChannel(socket.intValue());
+        InetSocketAddress localAddress = channel.localAddress();
+        assertTrue(channel.active);
+        assertNotNull(localAddress);
+        assertEquals(socket.localAddress(), localAddress);
+        channel.fd().close();
+    }
+
+    @Test
+    public void testLocalAddressBeforeAndAfterBind() {
+        EventLoopGroup group = new EpollEventLoopGroup(1);
+        try {
+            TestHandler handler = new TestHandler();
+            InetSocketAddress localAddressBeforeBind = new InetSocketAddress(LOCALHOST, 0);
+
+            Bootstrap bootstrap = new Bootstrap();
+            bootstrap.group(group)
+                    .channel(EpollDatagramChannel.class)
+                    .localAddress(localAddressBeforeBind)
+                    .handler(handler);
+
+            ChannelFuture future = bootstrap.bind().syncUninterruptibly();
+
+            assertNull(handler.localAddress);
+
+            SocketAddress localAddressAfterBind = future.channel().localAddress();
+            assertNotNull(localAddressAfterBind);
+            assertTrue(localAddressAfterBind instanceof InetSocketAddress);
+            assertTrue(((InetSocketAddress) localAddressAfterBind).getPort() != 0);
+
+            future.channel().close().syncUninterruptibly();
+        } finally {
+            group.shutdownGracefully();
+        }
+    }
+
+    private static void checkNotActiveNoLocalRemoteAddress(EpollDatagramChannel channel) throws IOException {
+        assertFalse(channel.active);
+        assertNull(channel.localAddress());
+        assertNull(channel.remoteAddress());
+        channel.fd().close();
+    }
+
+    private static final class TestHandler extends ChannelInboundHandlerAdapter {
+        private volatile SocketAddress localAddress;
+
+        @Override
+        public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
+            this.localAddress = ctx.channel().localAddress();
+            super.channelRegistered(ctx);
+        }
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDatagramConnectNotExistsTest.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2017 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.DatagramConnectNotExistsTest;
+
+import java.util.List;
+
+public class EpollDatagramConnectNotExistsTest extends DatagramConnectNotExistsTest {
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapFactory<Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.datagramSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDatagramMulticastIPv6Test.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2019 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.DatagramMulticastIPv6Test;
+
+import java.util.List;
+
+public class EpollDatagramMulticastIPv6Test extends DatagramMulticastIPv6Test {
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<Bootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.datagram(internetProtocolFamily());
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDatagramMulticastIpv6WithIpv4AddrTest.java

@@ -0,0 +1,32 @@
+/*
+ * Copyright 2021 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.channel.socket.InternetProtocolFamily;
+import io.netty.testsuite.transport.socket.DatagramMulticastTest;
+
+public class EpollDatagramMulticastIpv6WithIpv4AddrTest extends DatagramMulticastTest {
+
+    @Override
+    protected InternetProtocolFamily groupInternetProtocalFamily() {
+        return InternetProtocolFamily.IPv4;
+    }
+
+    @Override
+    protected InternetProtocolFamily socketInternetProtocalFamily() {
+        return InternetProtocolFamily.IPv6;
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDatagramMulticastTest.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2019 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.DatagramMulticastTest;
+
+import java.util.List;
+
+public class EpollDatagramMulticastTest extends DatagramMulticastTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<Bootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.datagram(internetProtocolFamily());
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDatagramScatteringReadTest.java

@@ -0,0 +1,307 @@
+/*
+ * Copyright 2019 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.channel.AdaptiveRecvByteBufAllocator;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelOption;
+import io.netty.channel.SimpleChannelInboundHandler;
+import io.netty.channel.socket.DatagramPacket;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.AbstractDatagramTest;
+import io.netty.util.internal.PlatformDependent;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInfo;
+
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+import static org.junit.jupiter.api.Assumptions.assumeTrue;
+
+public class EpollDatagramScatteringReadTest extends AbstractDatagramTest  {
+
+    @BeforeAll
+    public static void assumeRecvmmsgSupported() {
+        assumeTrue(Native.IS_SUPPORTING_RECVMMSG);
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<Bootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.epollOnlyDatagram(internetProtocolFamily());
+    }
+
+    @Test
+    public void testScatteringReadPartial(TestInfo testInfo) throws Throwable {
+        run(testInfo, new Runner<Bootstrap, Bootstrap>() {
+            @Override
+            public void run(Bootstrap bootstrap, Bootstrap bootstrap2) throws Throwable {
+                testScatteringReadPartial(bootstrap, bootstrap2);
+            }
+        });
+    }
+
+    public void testScatteringReadPartial(Bootstrap sb, Bootstrap cb) throws Throwable {
+        testScatteringRead(sb, cb, false, true);
+    }
+
+    @Test
+    public void testScatteringRead(TestInfo testInfo) throws Throwable {
+        run(testInfo, new Runner<Bootstrap, Bootstrap>() {
+            @Override
+            public void run(Bootstrap bootstrap, Bootstrap bootstrap2) throws Throwable {
+                testScatteringRead(bootstrap, bootstrap2);
+            }
+        });
+    }
+
+    public void testScatteringRead(Bootstrap sb, Bootstrap cb) throws Throwable {
+        testScatteringRead(sb, cb, false, false);
+    }
+
+    @Test
+    public void testScatteringReadConnectedPartial(TestInfo testInfo) throws Throwable {
+        run(testInfo, new Runner<Bootstrap, Bootstrap>() {
+            @Override
+            public void run(Bootstrap bootstrap, Bootstrap bootstrap2) throws Throwable {
+                testScatteringReadConnectedPartial(bootstrap, bootstrap2);
+            }
+        });
+    }
+
+    public void testScatteringReadConnectedPartial(Bootstrap sb, Bootstrap cb) throws Throwable {
+        testScatteringRead(sb, cb, true, true);
+    }
+
+    @Test
+    public void testScatteringConnectedRead(TestInfo testInfo) throws Throwable {
+        run(testInfo, new Runner<Bootstrap, Bootstrap>() {
+            @Override
+            public void run(Bootstrap bootstrap, Bootstrap bootstrap2) throws Throwable {
+                testScatteringConnectedRead(bootstrap, bootstrap2);
+            }
+        });
+    }
+
+    public void testScatteringConnectedRead(Bootstrap sb, Bootstrap cb) throws Throwable {
+        testScatteringRead(sb, cb, true, false);
+    }
+
+    private void testScatteringRead(Bootstrap sb, Bootstrap cb, boolean connected, boolean partial) throws Throwable {
+        int packetSize = 8;
+        int numPackets = 4;
+
+        sb.option(ChannelOption.RCVBUF_ALLOCATOR, new AdaptiveRecvByteBufAllocator(
+                packetSize, packetSize * (partial ? numPackets / 2 : numPackets), 64 * 1024));
+        // Set the MAX_DATAGRAM_PAYLOAD_SIZE to something bigger then the actual packet size.
+        // This will allow us to check if we correctly thread the received len.
+        sb.option(EpollChannelOption.MAX_DATAGRAM_PAYLOAD_SIZE, packetSize * 2);
+
+        Channel sc = null;
+        Channel cc = null;
+
+        try {
+            cb.handler(new SimpleChannelInboundHandler<Object>() {
+                @Override
+                public void channelRead0(ChannelHandlerContext ctx, Object msgs) throws Exception {
+                    // Nothing will be sent.
+                }
+            });
+            cc = cb.bind(newSocketAddress()).sync().channel();
+            final SocketAddress ccAddress = cc.localAddress();
+
+            final AtomicReference<Throwable> errorRef = new AtomicReference<Throwable>();
+
+            final CountDownLatch latch = new CountDownLatch(numPackets);
+            sb.handler(new SimpleChannelInboundHandler<DatagramPacket>() {
+                private long numRead;
+                private int counter;
+                @Override
+                public void channelReadComplete(ChannelHandlerContext ctx) {
+                    assertTrue(counter > 1);
+                    counter = 0;
+                    ctx.read();
+                }
+
+                @Override
+                protected void channelRead0(ChannelHandlerContext ctx, DatagramPacket msg) {
+                    assertEquals(ccAddress, msg.sender());
+
+                    // Each packet contains a long which represent the write iteration.
+                    assertEquals(8, msg.content().readableBytes());
+                    assertEquals(numRead, msg.content().readLong());
+                    numRead++;
+                    counter++;
+                    latch.countDown();
+                }
+
+                @Override
+                public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)  {
+                    errorRef.compareAndSet(null, cause);
+                }
+            });
+
+            sb.option(ChannelOption.AUTO_READ, false);
+            sc = sb.bind(newSocketAddress()).sync().channel();
+
+            if (connected) {
+                sc.connect(cc.localAddress()).syncUninterruptibly();
+            }
+
+            InetSocketAddress addr = (InetSocketAddress) sc.localAddress();
+
+            List<ChannelFuture> futures = new ArrayList<ChannelFuture>(numPackets);
+            for (int i = 0; i < numPackets; i++) {
+                futures.add(cc.write(new DatagramPacket(cc.alloc().directBuffer().writeLong(i), addr)));
+            }
+
+            cc.flush();
+
+            for (ChannelFuture f: futures) {
+                f.sync();
+            }
+
+            // Enable autoread now which also triggers a read, this should cause scattering reads (recvmmsg) to happen.
+            sc.config().setAutoRead(true);
+
+            if (!latch.await(10, TimeUnit.SECONDS)) {
+                Throwable error = errorRef.get();
+                if (error != null) {
+                    throw error;
+                }
+                fail("Timeout while waiting for packets");
+            }
+        } finally {
+            if (cc != null) {
+                cc.close().syncUninterruptibly();
+            }
+            if (sc != null) {
+                sc.close().syncUninterruptibly();
+            }
+        }
+    }
+
+    @Test
+    public void testScatteringReadWithSmallBuffer(TestInfo testInfo) throws Throwable {
+        run(testInfo, new Runner<Bootstrap, Bootstrap>() {
+            @Override
+            public void run(Bootstrap bootstrap, Bootstrap bootstrap2) throws Throwable {
+                testScatteringReadWithSmallBuffer(bootstrap, bootstrap2);
+            }
+        });
+    }
+
+    public void testScatteringReadWithSmallBuffer(Bootstrap sb, Bootstrap cb) throws Throwable {
+        testScatteringReadWithSmallBuffer0(sb, cb, false);
+    }
+
+    @Test
+    public void testScatteringConnectedReadWithSmallBuffer(TestInfo testInfo) throws Throwable {
+        run(testInfo, new Runner<Bootstrap, Bootstrap>() {
+            @Override
+            public void run(Bootstrap bootstrap, Bootstrap bootstrap2) throws Throwable {
+                testScatteringConnectedReadWithSmallBuffer(bootstrap, bootstrap2);
+            }
+        });
+    }
+
+    public void testScatteringConnectedReadWithSmallBuffer(Bootstrap sb, Bootstrap cb) throws Throwable {
+        testScatteringReadWithSmallBuffer0(sb, cb, true);
+    }
+
+    private void testScatteringReadWithSmallBuffer0(Bootstrap sb, Bootstrap cb, boolean connected) throws Throwable {
+        int packetSize = 16;
+
+        sb.option(ChannelOption.RCVBUF_ALLOCATOR, new AdaptiveRecvByteBufAllocator(1400, 1400, 64 * 1024));
+        sb.option(EpollChannelOption.MAX_DATAGRAM_PAYLOAD_SIZE, 1400);
+
+        Channel sc = null;
+        Channel cc = null;
+
+        try {
+            cb.handler(new SimpleChannelInboundHandler<Object>() {
+                @Override
+                public void channelRead0(ChannelHandlerContext ctx, Object msgs) {
+                    // Nothing will be sent.
+                }
+            });
+            cc = cb.bind(newSocketAddress()).sync().channel();
+            final SocketAddress ccAddress = cc.localAddress();
+
+            final AtomicReference<Throwable> errorRef = new AtomicReference<Throwable>();
+            final byte[] bytes = new byte[packetSize];
+            PlatformDependent.threadLocalRandom().nextBytes(bytes);
+
+            final CountDownLatch latch = new CountDownLatch(1);
+            sb.handler(new SimpleChannelInboundHandler<DatagramPacket>() {
+
+                @Override
+                protected void channelRead0(ChannelHandlerContext ctx, DatagramPacket msg) {
+                    assertEquals(ccAddress, msg.sender());
+
+                    assertEquals(bytes.length, msg.content().readableBytes());
+                    byte[] receivedBytes = new byte[bytes.length];
+                    msg.content().readBytes(receivedBytes);
+                    assertArrayEquals(bytes, receivedBytes);
+
+                    latch.countDown();
+                }
+
+                @Override
+                public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)  {
+                    errorRef.compareAndSet(null, cause);
+                }
+            });
+
+            sc = sb.bind(newSocketAddress()).sync().channel();
+
+            if (connected) {
+                sc.connect(cc.localAddress()).syncUninterruptibly();
+            }
+
+            InetSocketAddress addr = (InetSocketAddress) sc.localAddress();
+
+            cc.writeAndFlush(new DatagramPacket(cc.alloc().directBuffer().writeBytes(bytes), addr)).sync();
+
+            if (!latch.await(10, TimeUnit.SECONDS)) {
+                Throwable error = errorRef.get();
+                if (error != null) {
+                    throw error;
+                }
+                fail("Timeout while waiting for packets");
+            }
+        } finally {
+            if (cc != null) {
+                cc.close().syncUninterruptibly();
+            }
+            if (sc != null) {
+                sc.close().syncUninterruptibly();
+            }
+        }
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDatagramUnicastIPv6MappedTest.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2019 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation.BootstrapComboFactory;
+import io.netty.testsuite.transport.socket.DatagramUnicastIPv6MappedTest;
+
+import java.util.List;
+
+public class EpollDatagramUnicastIPv6MappedTest extends DatagramUnicastIPv6MappedTest {
+    @Override
+    protected List<BootstrapComboFactory<Bootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.datagram(internetProtocolFamily());
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDatagramUnicastIPv6Test.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2019 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.DatagramUnicastIPv6Test;
+
+import java.util.List;
+
+public class EpollDatagramUnicastIPv6Test extends DatagramUnicastIPv6Test {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<Bootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.datagram(internetProtocolFamily());
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDatagramUnicastTest.java

@@ -0,0 +1,190 @@
+/*
+ * Copyright 2014 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.CompositeByteBuf;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelOption;
+import io.netty.channel.FixedRecvByteBufAllocator;
+import io.netty.channel.SimpleChannelInboundHandler;
+import io.netty.channel.socket.DatagramPacket;
+import io.netty.channel.socket.InternetProtocolFamily;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.DatagramUnicastInetTest;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInfo;
+
+import java.net.InetSocketAddress;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.fail;
+import static org.junit.jupiter.api.Assumptions.assumeTrue;
+
+public class EpollDatagramUnicastTest extends DatagramUnicastInetTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<Bootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.datagram(InternetProtocolFamily.IPv4);
+    }
+
+    public void testSimpleSendWithConnect(Bootstrap sb, Bootstrap cb) throws Throwable {
+        // Run this test with IP_RECVORIGDSTADDR option enabled
+        sb.option(EpollChannelOption.IP_RECVORIGDSTADDR, true);
+        super.testSimpleSendWithConnect(sb, cb);
+        sb.option(EpollChannelOption.IP_RECVORIGDSTADDR, false);
+    }
+
+    @Test
+    public void testSendSegmentedDatagramPacket(TestInfo testInfo) throws Throwable {
+        run(testInfo, new Runner<Bootstrap, Bootstrap>() {
+            @Override
+            public void run(Bootstrap bootstrap, Bootstrap bootstrap2) throws Throwable {
+                testSendSegmentedDatagramPacket(bootstrap, bootstrap2);
+            }
+        });
+    }
+
+    public void testSendSegmentedDatagramPacket(Bootstrap sb, Bootstrap cb) throws Throwable {
+        testSegmentedDatagramPacket(sb, cb, false, false);
+    }
+
+    @Test
+    public void testSendSegmentedDatagramPacketComposite(TestInfo testInfo) throws Throwable {
+        run(testInfo, new Runner<Bootstrap, Bootstrap>() {
+            @Override
+            public void run(Bootstrap bootstrap, Bootstrap bootstrap2) throws Throwable {
+                testSendSegmentedDatagramPacketComposite(bootstrap, bootstrap2);
+            }
+        });
+    }
+
+    public void testSendSegmentedDatagramPacketComposite(Bootstrap sb, Bootstrap cb) throws Throwable {
+        testSegmentedDatagramPacket(sb, cb, true, false);
+    }
+
+    @Test
+    public void testSendAndReceiveSegmentedDatagramPacket(TestInfo testInfo) throws Throwable {
+        run(testInfo, new Runner<Bootstrap, Bootstrap>() {
+            @Override
+            public void run(Bootstrap bootstrap, Bootstrap bootstrap2) throws Throwable {
+                testSendAndReceiveSegmentedDatagramPacket(bootstrap, bootstrap2);
+            }
+        });
+    }
+
+    public void testSendAndReceiveSegmentedDatagramPacket(Bootstrap sb, Bootstrap cb) throws Throwable {
+        testSegmentedDatagramPacket(sb, cb, false, true);
+    }
+
+    @Test
+    public void testSendAndReceiveSegmentedDatagramPacketComposite(TestInfo testInfo) throws Throwable {
+        run(testInfo, new Runner<Bootstrap, Bootstrap>() {
+            @Override
+            public void run(Bootstrap bootstrap, Bootstrap bootstrap2) throws Throwable {
+                testSendAndReceiveSegmentedDatagramPacketComposite(bootstrap, bootstrap2);
+            }
+        });
+    }
+
+    public void testSendAndReceiveSegmentedDatagramPacketComposite(Bootstrap sb, Bootstrap cb) throws Throwable {
+        testSegmentedDatagramPacket(sb, cb, true, true);
+    }
+
+    private void testSegmentedDatagramPacket(Bootstrap sb, Bootstrap cb, boolean composite, boolean gro)
+            throws Throwable {
+        if (!(cb.group() instanceof EpollEventLoopGroup)) {
+            // Only supported for the native epoll transport.
+            return;
+        }
+        if (gro && !(sb.group() instanceof EpollEventLoopGroup)) {
+            // Only supported for the native epoll transport.
+            return;
+        }
+        assumeTrue(EpollDatagramChannel.isSegmentedDatagramPacketSupported());
+        Channel sc = null;
+        Channel cc = null;
+
+        try {
+            cb.handler(new SimpleChannelInboundHandler<Object>() {
+                @Override
+                public void channelRead0(ChannelHandlerContext ctx, Object msgs) {
+                    // Nothing will be sent.
+                }
+            });
+
+            cc = cb.bind(newSocketAddress()).sync().channel();
+
+            final int numBuffers = 16;
+            final int segmentSize = 512;
+            int bufferCapacity = numBuffers * segmentSize;
+            final CountDownLatch latch = new CountDownLatch(numBuffers);
+            AtomicReference<Throwable> errorRef = new AtomicReference<Throwable>();
+            if (gro) {
+                // Enable GRO and also ensure we can read everything with one read as otherwise
+                // we will drop things on the floor.
+                sb.option(EpollChannelOption.UDP_GRO, true);
+                sb.option(ChannelOption.RCVBUF_ALLOCATOR, new FixedRecvByteBufAllocator(bufferCapacity));
+            }
+            sc = sb.handler(new SimpleChannelInboundHandler<DatagramPacket>() {
+                @Override
+                public void channelRead0(ChannelHandlerContext ctx, DatagramPacket packet) {
+                    if (packet.content().readableBytes() == segmentSize) {
+                        latch.countDown();
+                    }
+                }
+            }).bind(newSocketAddress()).sync().channel();
+
+            if (sc instanceof EpollDatagramChannel) {
+                assertEquals(gro, sc.config().getOption(EpollChannelOption.UDP_GRO));
+            }
+            InetSocketAddress addr = sendToAddress((InetSocketAddress) sc.localAddress());
+            final ByteBuf buffer;
+            if (composite) {
+                CompositeByteBuf compositeBuffer = Unpooled.compositeBuffer();
+                for (int i = 0; i < numBuffers; i++) {
+                    compositeBuffer.addComponent(true,
+                            Unpooled.directBuffer(segmentSize).writeZero(segmentSize));
+                }
+                buffer = compositeBuffer;
+            } else {
+                buffer = Unpooled.directBuffer(bufferCapacity).writeZero(bufferCapacity);
+            }
+            cc.writeAndFlush(new io.netty.channel.unix.SegmentedDatagramPacket(buffer, segmentSize, addr)).sync();
+
+            if (!latch.await(10, TimeUnit.SECONDS)) {
+                Throwable error = errorRef.get();
+                if (error != null) {
+                    throw error;
+                }
+                fail();
+            }
+        } finally {
+            if (cc != null) {
+                cc.close().sync();
+            }
+            if (sc != null) {
+                sc.close().sync();
+            }
+        }
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDetectPeerCloseWithoutReadTest.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2017 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.channel.Channel;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.ServerChannel;
+
+public class EpollDetectPeerCloseWithoutReadTest extends DetectPeerCloseWithoutReadTest {
+    @Override
+    protected EventLoopGroup newGroup() {
+        return new EpollEventLoopGroup(2);
+    }
+
+    @Override
+    protected Class<? extends ServerChannel> serverChannel() {
+        return EpollServerSocketChannel.class;
+    }
+
+    @Override
+    protected Class<? extends Channel> clientChannel() {
+        return EpollSocketChannel.class;
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainDatagramChannelTest.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2023 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class EpollDomainDatagramChannelTest {
+
+    @BeforeEach
+    public void setUp() {
+        Epoll.ensureAvailability();
+    }
+
+    @Test
+    public void testDefaultMaxMessagePerRead() {
+        EpollDomainDatagramChannel channel = new EpollDomainDatagramChannel();
+        assertEquals(16, channel.config().getMaxMessagesPerRead());
+        channel.unsafe().closeForcibly();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainDatagramPathTest.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2021 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.channel.unix.DomainDatagramPacket;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.AbstractClientSocketTest;
+import io.netty.util.CharsetUtil;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInfo;
+
+import java.io.FileNotFoundException;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+
+class EpollDomainDatagramPathTest extends AbstractClientSocketTest {
+
+    @Test
+    void testConnectPathDoesNotExist(TestInfo testInfo) throws Throwable {
+        run(testInfo, new Runner<Bootstrap>() {
+            @Override
+            public void run(Bootstrap bootstrap) {
+                try {
+                    bootstrap.handler(new ChannelInboundHandlerAdapter())
+                             .connect(EpollSocketTestPermutation.newDomainSocketAddress()).sync().channel();
+                    fail("Expected FileNotFoundException");
+                } catch (Exception e) {
+                    assertTrue(e instanceof FileNotFoundException);
+                }
+            }
+        });
+    }
+
+    @Test
+    void testWriteReceiverPathDoesNotExist(TestInfo testInfo) throws Throwable {
+        run(testInfo, new Runner<Bootstrap>() {
+            @Override
+            public void run(Bootstrap bootstrap) {
+                try {
+                    Channel ch = bootstrap.handler(new ChannelInboundHandlerAdapter())
+                                          .bind(EpollSocketTestPermutation.newDomainSocketAddress()).sync().channel();
+                    ch.writeAndFlush(new DomainDatagramPacket(
+                            Unpooled.copiedBuffer("test", CharsetUtil.US_ASCII),
+                            EpollSocketTestPermutation.newDomainSocketAddress())).sync();
+                    fail("Expected FileNotFoundException");
+                } catch (Exception e) {
+                    assertTrue(e instanceof FileNotFoundException);
+                }
+            }
+        });
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapFactory<Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainDatagramSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainDatagramUnicastTest.java

@@ -0,0 +1,168 @@
+/*
+ * Copyright 2021 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.channel.SimpleChannelInboundHandler;
+import io.netty.channel.unix.DomainDatagramChannel;
+import io.netty.channel.unix.DomainDatagramPacket;
+import io.netty.channel.unix.DomainSocketAddress;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.DatagramUnicastTest;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInfo;
+
+import java.net.SocketAddress;
+import java.util.List;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+class EpollDomainDatagramUnicastTest extends DatagramUnicastTest {
+
+    @Test
+    void testBind(TestInfo testInfo) throws Throwable {
+        run(testInfo, new Runner<Bootstrap, Bootstrap>() {
+            @Override
+            public void run(Bootstrap bootstrap, Bootstrap bootstrap2) throws Throwable {
+                testBind(bootstrap2);
+            }
+        });
+    }
+
+    private void testBind(Bootstrap cb) throws Throwable {
+        Channel channel = null;
+        try {
+            channel = cb.handler(new ChannelInboundHandlerAdapter())
+                        .bind(newSocketAddress()).sync().channel();
+            assertThat(channel.localAddress()).isNotNull()
+                    .isInstanceOf(DomainSocketAddress.class);
+        } finally {
+            closeChannel(channel);
+        }
+    }
+
+    @Override
+    protected boolean supportDisconnect() {
+        return false;
+    }
+
+    @Override
+    protected boolean isConnected(Channel channel) {
+        return ((DomainDatagramChannel) channel).isConnected();
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<Bootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainDatagram();
+    }
+
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+
+    @Override
+    protected Channel setupClientChannel(Bootstrap cb, final byte[] bytes, final CountDownLatch latch,
+                                         final AtomicReference<Throwable> errorRef) throws Throwable {
+        cb.handler(new SimpleChannelInboundHandler<DomainDatagramPacket>() {
+
+            @Override
+            public void channelRead0(ChannelHandlerContext ctx, DomainDatagramPacket msg) {
+                try {
+                    ByteBuf buf = msg.content();
+                    assertEquals(bytes.length, buf.readableBytes());
+                    for (int i = 0; i < bytes.length; i++) {
+                        assertEquals(bytes[i], buf.getByte(buf.readerIndex() + i));
+                    }
+
+                    assertEquals(ctx.channel().localAddress(), msg.recipient());
+                } finally {
+                    latch.countDown();
+                }
+            }
+
+            @Override
+            public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
+                errorRef.compareAndSet(null, cause);
+            }
+        });
+        return cb.bind(newSocketAddress()).sync().channel();
+    }
+
+    @Override
+    protected Channel setupServerChannel(Bootstrap sb, final byte[] bytes, final SocketAddress sender,
+                                         final CountDownLatch latch, final AtomicReference<Throwable> errorRef,
+                                         final boolean echo) throws Throwable {
+        sb.handler(new SimpleChannelInboundHandler<DomainDatagramPacket>() {
+
+            @Override
+            public void channelRead0(ChannelHandlerContext ctx, DomainDatagramPacket msg) {
+                try {
+                    if (sender == null) {
+                        assertNotNull(msg.sender());
+                    } else {
+                        assertEquals(sender, msg.sender());
+                    }
+
+                    ByteBuf buf = msg.content();
+                    assertEquals(bytes.length, buf.readableBytes());
+                    for (int i = 0; i < bytes.length; i++) {
+                        assertEquals(bytes[i], buf.getByte(buf.readerIndex() + i));
+                    }
+
+                    assertEquals(ctx.channel().localAddress(), msg.recipient());
+
+                    if (echo) {
+                        ctx.writeAndFlush(new DomainDatagramPacket(buf.retainedDuplicate(), msg.sender()));
+                    }
+                } finally {
+                    latch.countDown();
+                }
+            }
+
+            @Override
+            public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
+                errorRef.compareAndSet(null, cause);
+            }
+        });
+        return sb.bind(newSocketAddress()).sync().channel();
+    }
+
+    @Override
+    protected ChannelFuture write(Channel cc, ByteBuf buf, SocketAddress remote, WrapType wrapType) {
+        switch (wrapType) {
+            case DUP:
+                return cc.write(new DomainDatagramPacket(buf.retainedDuplicate(), (DomainSocketAddress) remote));
+            case SLICE:
+                return cc.write(new DomainDatagramPacket(buf.retainedSlice(), (DomainSocketAddress) remote));
+            case READ_ONLY:
+                return cc.write(new DomainDatagramPacket(buf.retain().asReadOnly(), (DomainSocketAddress) remote));
+            case NONE:
+                return cc.write(new DomainDatagramPacket(buf.retain(), (DomainSocketAddress) remote));
+            default:
+                throw new Error("unknown wrap type: " + wrapType);
+        }
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainSocketAddressesTest.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2023 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.unix.DomainSocketAddress;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketAddressesTest;
+
+import java.net.SocketAddress;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+class EpollDomainSocketAddressesTest extends SocketAddressesTest {
+
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainSocket();
+    }
+
+    @Override
+    protected void assertAddress(SocketAddress address) {
+        assertNotNull(((DomainSocketAddress) address).path());
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainSocketDataReadInitialStateTest.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2018 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketDataReadInitialStateTest;
+
+import java.net.SocketAddress;
+import java.util.List;
+
+public class EpollDomainSocketDataReadInitialStateTest extends SocketDataReadInitialStateTest {
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainSocketEchoTest.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+
+import java.net.SocketAddress;
+import java.util.List;
+
+public class EpollDomainSocketEchoTest extends EpollSocketEchoTest {
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainSocketFdTest.java

@@ -0,0 +1,116 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.channel.unix.DomainSocketReadMode;
+import io.netty.channel.unix.FileDescriptor;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.AbstractSocketTest;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInfo;
+import org.junit.jupiter.api.Timeout;
+
+import java.net.SocketAddress;
+import java.util.List;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.TimeUnit;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class EpollDomainSocketFdTest extends AbstractSocketTest {
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainSocket();
+    }
+
+    @Test
+    @Timeout(value = 30000, unit = TimeUnit.MILLISECONDS)
+    public void testSendRecvFd(TestInfo testInfo) throws Throwable {
+        run(testInfo, new Runner<ServerBootstrap, Bootstrap>() {
+            @Override
+            public void run(ServerBootstrap serverBootstrap, Bootstrap bootstrap) throws Throwable {
+                testSendRecvFd(serverBootstrap, bootstrap);
+            }
+        });
+    }
+
+    public void testSendRecvFd(ServerBootstrap sb, Bootstrap cb) throws Throwable {
+        final BlockingQueue<Object> queue = new LinkedBlockingQueue<Object>(1);
+        sb.childHandler(new ChannelInboundHandlerAdapter() {
+            @Override
+            public void channelActive(ChannelHandlerContext ctx) throws Exception {
+                // Create new channel and obtain a file descriptor from it.
+                final EpollDomainSocketChannel ch = new EpollDomainSocketChannel();
+
+                ctx.writeAndFlush(ch.fd()).addListener(new ChannelFutureListener() {
+                    @Override
+                    public void operationComplete(ChannelFuture future) throws Exception {
+                        if (!future.isSuccess()) {
+                            Throwable cause = future.cause();
+                            queue.offer(cause);
+                        }
+                    }
+                });
+            }
+        });
+        cb.handler(new ChannelInboundHandlerAdapter() {
+            @Override
+            public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+                FileDescriptor fd = (FileDescriptor) msg;
+                queue.offer(fd);
+            }
+
+            @Override
+            public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
+                queue.add(cause);
+                ctx.close();
+            }
+        });
+        cb.option(EpollChannelOption.DOMAIN_SOCKET_READ_MODE,
+                DomainSocketReadMode.FILE_DESCRIPTORS);
+        Channel sc = sb.bind().sync().channel();
+        Channel cc = cb.connect(sc.localAddress()).sync().channel();
+
+        Object received = queue.take();
+        cc.close().sync();
+        sc.close().sync();
+
+        if (received instanceof FileDescriptor) {
+            FileDescriptor fd = (FileDescriptor) received;
+            assertTrue(fd.isOpen());
+            fd.close();
+            assertFalse(fd.isOpen());
+            assertNull(queue.poll());
+        } else {
+            throw (Throwable) received;
+        }
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainSocketFileRegionTest.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+
+import java.net.SocketAddress;
+import java.util.List;
+
+public class EpollDomainSocketFileRegionTest extends EpollSocketFileRegionTest {
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainSocketFixedLengthEchoTest.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketFixedLengthEchoTest;
+
+import java.net.SocketAddress;
+import java.util.List;
+
+public class EpollDomainSocketFixedLengthEchoTest extends SocketFixedLengthEchoTest {
+
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainSocketGatheringWriteTest.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketGatheringWriteTest;
+
+import java.net.SocketAddress;
+import java.util.List;
+
+public class EpollDomainSocketGatheringWriteTest extends SocketGatheringWriteTest {
+
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainSocketObjectEchoTest.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketObjectEchoTest;
+
+import java.net.SocketAddress;
+import java.util.List;
+
+public class EpollDomainSocketObjectEchoTest extends SocketObjectEchoTest {
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainSocketReuseFdTest.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2019 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.AbstractSocketReuseFdTest;
+
+import java.net.SocketAddress;
+import java.util.List;
+
+public class EpollDomainSocketReuseFdTest extends AbstractSocketReuseFdTest {
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainSocketShutdownOutputByPeerTest.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2019 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.unix.Buffer;
+import io.netty.testsuite.transport.TestsuitePermutation.BootstrapFactory;
+import io.netty.testsuite.transport.socket.AbstractSocketShutdownOutputByPeerTest;
+
+import java.io.IOException;
+import java.net.SocketAddress;
+import java.nio.ByteBuffer;
+import java.util.List;
+
+public class EpollDomainSocketShutdownOutputByPeerTest extends AbstractSocketShutdownOutputByPeerTest<LinuxSocket> {
+
+    @Override
+    protected List<BootstrapFactory<ServerBootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.serverDomainSocket();
+    }
+
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+
+    @Override
+    protected void shutdownOutput(LinuxSocket s) throws IOException {
+        s.shutdown(false, true);
+    }
+
+    @Override
+    protected void connect(LinuxSocket s, SocketAddress address) throws IOException {
+        s.connect(address);
+    }
+
+    @Override
+    protected void close(LinuxSocket s) throws IOException {
+        s.close();
+    }
+
+    @Override
+    protected void write(LinuxSocket s, int data) throws IOException {
+        final ByteBuffer buf = Buffer.allocateDirectWithNativeOrder(4);
+        buf.putInt(data);
+        buf.flip();
+        s.send(buf, buf.position(), buf.limit());
+        Buffer.free(buf);
+    }
+
+    @Override
+    protected LinuxSocket newSocket() {
+        return LinuxSocket.newSocketDomain();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainSocketSslClientRenegotiateTest.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2019 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketSslClientRenegotiateTest;
+
+import java.net.SocketAddress;
+import java.util.List;
+
+public class EpollDomainSocketSslClientRenegotiateTest extends SocketSslClientRenegotiateTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainSocket();
+    }
+
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainSocketSslEchoTest.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketSslEchoTest;
+
+import java.net.SocketAddress;
+import java.util.List;
+
+public class EpollDomainSocketSslEchoTest extends SocketSslEchoTest {
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainSocketSslGreetingTest.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketSslGreetingTest;
+
+import java.net.SocketAddress;
+import java.util.List;
+
+public class EpollDomainSocketSslGreetingTest extends SocketSslGreetingTest {
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainSocketStartTlsTest.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketStartTlsTest;
+
+import java.net.SocketAddress;
+import java.util.List;
+
+public class EpollDomainSocketStartTlsTest extends SocketStartTlsTest {
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollDomainSocketStringEchoTest.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketStringEchoTest;
+
+import java.net.SocketAddress;
+import java.util.List;
+
+public class EpollDomainSocketStringEchoTest extends SocketStringEchoTest {
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return EpollSocketTestPermutation.newDomainSocketAddress();
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.domainSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollETSocketAutoReadTest.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketAutoReadTest;
+
+import java.util.List;
+
+public class EpollETSocketAutoReadTest extends SocketAutoReadTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+
+    @Override
+    protected void configure(ServerBootstrap bootstrap, Bootstrap bootstrap2, ByteBufAllocator allocator) {
+        super.configure(bootstrap, bootstrap2, allocator);
+        bootstrap.option(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED)
+                .childOption(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED);
+        bootstrap2.option(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED);
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollETSocketConditionalWritabilityTest.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2018 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketConditionalWritabilityTest;
+
+import java.util.List;
+
+public class EpollETSocketConditionalWritabilityTest extends SocketConditionalWritabilityTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+
+    @Override
+    protected void configure(ServerBootstrap bootstrap, Bootstrap bootstrap2, ByteBufAllocator allocator) {
+        super.configure(bootstrap, bootstrap2, allocator);
+        bootstrap.option(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED)
+                .childOption(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED);
+        bootstrap2.option(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED);
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollETSocketDataReadInitialStateTest.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2018 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketDataReadInitialStateTest;
+
+import java.util.List;
+
+public class EpollETSocketDataReadInitialStateTest extends SocketDataReadInitialStateTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+
+    @Override
+    protected void configure(ServerBootstrap bootstrap, Bootstrap bootstrap2, ByteBufAllocator allocator) {
+        super.configure(bootstrap, bootstrap2, allocator);
+        bootstrap.option(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED)
+                .childOption(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED);
+        bootstrap2.option(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED);
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollETSocketExceptionHandlingTest.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketExceptionHandlingTest;
+
+import java.util.List;
+
+public class EpollETSocketExceptionHandlingTest extends SocketExceptionHandlingTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+
+    @Override
+    protected void configure(ServerBootstrap bootstrap, Bootstrap bootstrap2, ByteBufAllocator allocator) {
+        super.configure(bootstrap, bootstrap2, allocator);
+        bootstrap.option(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED)
+                 .childOption(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED);
+        bootstrap2.option(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED);
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollETSocketHalfClosedTest.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2017 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketHalfClosedTest;
+
+import java.util.List;
+
+public class EpollETSocketHalfClosedTest extends SocketHalfClosedTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithoutFastOpen();
+    }
+
+    @Override
+    protected void configure(ServerBootstrap bootstrap, Bootstrap bootstrap2, ByteBufAllocator allocator) {
+        super.configure(bootstrap, bootstrap2, allocator);
+        bootstrap.option(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED)
+                .childOption(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED);
+        bootstrap2.option(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED);
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollETSocketReadPendingTest.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketReadPendingTest;
+
+import java.util.List;
+
+public class EpollETSocketReadPendingTest extends SocketReadPendingTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+
+    @Override
+    protected void configure(ServerBootstrap bootstrap, Bootstrap bootstrap2, ByteBufAllocator allocator) {
+        super.configure(bootstrap, bootstrap2, allocator);
+        bootstrap.option(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED)
+                 .childOption(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED);
+        bootstrap2.option(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED);
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollETSocketStringEchoBusyWaitTest.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2018 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBufAllocator;
+
+public class EpollETSocketStringEchoBusyWaitTest extends EpollSocketStringEchoBusyWaitTest {
+
+    @Override
+    protected void configure(ServerBootstrap bootstrap, Bootstrap bootstrap2, ByteBufAllocator allocator) {
+        super.configure(bootstrap, bootstrap2, allocator);
+        bootstrap.option(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED)
+                .childOption(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED);
+        bootstrap2.option(EpollChannelOption.EPOLL_MODE, EpollMode.EDGE_TRIGGERED);
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollEventLoopTest.java

@@ -0,0 +1,189 @@
+/*
+ * Copyright 2017 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.testsuite.transport.AbstractSingleThreadEventLoopTest;
+import io.netty.channel.DefaultSelectStrategyFactory;
+import io.netty.channel.EventLoop;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.ServerChannel;
+import io.netty.channel.socket.ServerSocketChannel;
+import io.netty.channel.unix.FileDescriptor;
+import io.netty.util.concurrent.DefaultThreadFactory;
+import io.netty.util.concurrent.Future;
+import io.netty.util.concurrent.RejectedExecutionHandlers;
+import io.netty.util.concurrent.ThreadPerTaskExecutor;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class EpollEventLoopTest extends AbstractSingleThreadEventLoopTest {
+
+    @Override
+    protected boolean supportsChannelIteration() {
+        return true;
+    }
+
+    @Override
+    protected EventLoopGroup newEventLoopGroup() {
+        return new EpollEventLoopGroup();
+    }
+
+    @Override
+    protected ServerSocketChannel newChannel() {
+        return new EpollServerSocketChannel();
+    }
+
+    @Override
+    protected Class<? extends ServerChannel> serverChannelClass() {
+        return EpollServerSocketChannel.class;
+    }
+
+    @Test
+    public void testScheduleBigDelayNotOverflow() {
+        final AtomicReference<Throwable> capture = new AtomicReference<Throwable>();
+
+        final EventLoopGroup group = new EpollEventLoop(null,
+                new ThreadPerTaskExecutor(new DefaultThreadFactory(getClass())), 0,
+                DefaultSelectStrategyFactory.INSTANCE.newSelectStrategy(), RejectedExecutionHandlers.reject(),
+                null, null) {
+            @Override
+            void handleLoopException(Throwable t) {
+                capture.set(t);
+                super.handleLoopException(t);
+            }
+        };
+
+        try {
+            final EventLoop eventLoop = group.next();
+            Future<?> future = eventLoop.schedule(new Runnable() {
+                @Override
+                public void run() {
+                    // NOOP
+                }
+            }, Long.MAX_VALUE, TimeUnit.MILLISECONDS);
+
+            assertFalse(future.awaitUninterruptibly(1000));
+            assertTrue(future.cancel(true));
+            assertNull(capture.get());
+        } finally {
+            group.shutdownGracefully();
+        }
+    }
+
+    @Test
+    public void testEventFDETSemantics() throws Throwable {
+        final FileDescriptor epoll = Native.newEpollCreate();
+        final FileDescriptor eventFd = Native.newEventFd();
+        final FileDescriptor timerFd = Native.newTimerFd();
+        final EpollEventArray array = new EpollEventArray(1024);
+        try {
+            Native.epollCtlAdd(epoll.intValue(), eventFd.intValue(), Native.EPOLLIN | Native.EPOLLET);
+            final AtomicReference<Throwable> causeRef = new AtomicReference<Throwable>();
+            final AtomicInteger integer = new AtomicInteger();
+            final Thread t = new Thread(new Runnable() {
+                @Override
+                public void run() {
+                    try {
+                        for (int i = 0; i < 2; i++) {
+                            int ready = Native.epollWait(epoll, array, timerFd, -1, -1);
+                            assertEquals(1, ready);
+                            assertEquals(eventFd.intValue(), array.fd(0));
+                            integer.incrementAndGet();
+                        }
+                    } catch (IOException e) {
+                        causeRef.set(e);
+                    }
+                }
+            });
+            t.start();
+            Native.eventFdWrite(eventFd.intValue(), 1);
+
+            // Spin until we was the wakeup.
+            while (integer.get() != 1) {
+                Thread.sleep(10);
+            }
+            // Sleep for a short moment to ensure there is not other wakeup.
+            Thread.sleep(1000);
+            assertEquals(1, integer.get());
+            Native.eventFdWrite(eventFd.intValue(), 1);
+            t.join();
+            Throwable cause = causeRef.get();
+            if (cause != null) {
+                throw cause;
+            }
+            assertEquals(2, integer.get());
+        } finally {
+            array.free();
+            epoll.close();
+            eventFd.close();
+            timerFd.close();
+        }
+    }
+
+    @Test
+    public void testResultNoTimeoutCorrectlyEncoded() throws Throwable {
+        final FileDescriptor epoll = Native.newEpollCreate();
+        final FileDescriptor eventFd = Native.newEventFd();
+        final FileDescriptor timerFd = Native.newTimerFd();
+        final EpollEventArray array = new EpollEventArray(1024);
+        try {
+            Native.epollCtlAdd(epoll.intValue(), eventFd.intValue(), Native.EPOLLIN | Native.EPOLLET);
+            final AtomicReference<Throwable> causeRef = new AtomicReference<Throwable>();
+            final Thread t = new Thread(new Runnable() {
+                @Override
+                public void run() {
+                    try {
+                        for (;;) {
+                            long ready = Native.epollWait(epoll, array, timerFd, 0, 0, 10);
+                            if (ready > 0) {
+                                assertEquals(1, Native.epollReady(ready));
+                                assertEquals(eventFd.intValue(), array.fd(0));
+                                return;
+                            }
+                            Thread.sleep(100);
+                        }
+                    } catch (IOException e) {
+                        causeRef.set(e);
+                    } catch (InterruptedException ignore) {
+                        // ignore
+                    }
+                }
+            });
+            t.start();
+            Native.eventFdWrite(eventFd.intValue(), 1);
+
+            t.join();
+            Throwable cause = causeRef.get();
+            if (cause != null) {
+                throw cause;
+            }
+        } finally {
+            array.free();
+            epoll.close();
+            eventFd.close();
+            timerFd.close();
+        }
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollJdkLoopbackSocketSslEchoTest.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2021 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import java.net.SocketAddress;
+
+public class EpollJdkLoopbackSocketSslEchoTest extends EpollSocketSslEchoTest {
+    @Override
+    protected SocketAddress newSocketAddress() {
+        return UnixTestUtils.newInetLoopbackSocketAddress();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollKQueueIovArrayTest.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2020 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import org.junit.jupiter.api.BeforeAll;
+
+public class EpollKQueueIovArrayTest extends IovArrayTest {
+
+    @BeforeAll
+    public static void loadNative() {
+        Epoll.ensureAvailability();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollLTSocketAutoReadTest.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketAutoReadTest;
+
+import java.util.List;
+
+public class EpollLTSocketAutoReadTest extends SocketAutoReadTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+
+    @Override
+    protected void configure(ServerBootstrap bootstrap, Bootstrap bootstrap2, ByteBufAllocator allocator) {
+        super.configure(bootstrap, bootstrap2, allocator);
+        bootstrap.option(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED)
+                .childOption(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+        bootstrap2.option(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollLTSocketConditionalWritabilityTest.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2018 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketConditionalWritabilityTest;
+
+import java.util.List;
+
+public class EpollLTSocketConditionalWritabilityTest extends SocketConditionalWritabilityTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+
+    @Override
+    protected void configure(ServerBootstrap bootstrap, Bootstrap bootstrap2, ByteBufAllocator allocator) {
+        super.configure(bootstrap, bootstrap2, allocator);
+        bootstrap.option(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED)
+                .childOption(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+        bootstrap2.option(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollLTSocketDataReadInitialStateTest.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2018 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketDataReadInitialStateTest;
+
+import java.util.List;
+
+public class EpollLTSocketDataReadInitialStateTest extends SocketDataReadInitialStateTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+
+    @Override
+    protected void configure(ServerBootstrap bootstrap, Bootstrap bootstrap2, ByteBufAllocator allocator) {
+        super.configure(bootstrap, bootstrap2, allocator);
+        bootstrap.option(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED)
+                .childOption(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+        bootstrap2.option(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollLTSocketExceptionHandlingTest.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketExceptionHandlingTest;
+
+import java.util.List;
+
+public class EpollLTSocketExceptionHandlingTest extends SocketExceptionHandlingTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+
+    @Override
+    protected void configure(ServerBootstrap bootstrap, Bootstrap bootstrap2, ByteBufAllocator allocator) {
+        super.configure(bootstrap, bootstrap2, allocator);
+        bootstrap.option(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED)
+                 .childOption(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+        bootstrap2.option(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollLTSocketHalfClosedTest.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2017 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketHalfClosedTest;
+
+import java.util.List;
+
+public class EpollLTSocketHalfClosedTest extends SocketHalfClosedTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithoutFastOpen();
+    }
+
+    @Override
+    protected void configure(ServerBootstrap bootstrap, Bootstrap bootstrap2, ByteBufAllocator allocator) {
+        super.configure(bootstrap, bootstrap2, allocator);
+        bootstrap.option(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED)
+                .childOption(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+        bootstrap2.option(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollLTSocketReadPendingTest.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketReadPendingTest;
+
+import java.util.List;
+
+public class EpollLTSocketReadPendingTest extends SocketReadPendingTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+
+    @Override
+    protected void configure(ServerBootstrap bootstrap, Bootstrap bootstrap2, ByteBufAllocator allocator) {
+        super.configure(bootstrap, bootstrap2, allocator);
+        bootstrap.option(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED)
+                 .childOption(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+        bootstrap2.option(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollLTSocketStringEchoBusyWaitTest.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2018 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBufAllocator;
+
+public class EpollLTSocketStringEchoBusyWaitTest extends EpollSocketStringEchoBusyWaitTest {
+
+    @Override
+    protected void configure(ServerBootstrap bootstrap, Bootstrap bootstrap2, ByteBufAllocator allocator) {
+        super.configure(bootstrap, bootstrap2, allocator);
+        bootstrap.option(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED)
+                .childOption(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+        bootstrap2.option(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollReuseAddrTest.java

@@ -0,0 +1,263 @@
+/*
+ * Copyright 2014 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.AbstractBootstrap;
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerAdapter;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.handler.logging.LogLevel;
+import io.netty.handler.logging.LoggingHandler;
+import io.netty.util.NetUtil;
+import io.netty.util.ReferenceCountUtil;
+import io.netty.util.ResourceLeakDetector;
+import io.netty.util.internal.logging.InternalLogLevel;
+import io.netty.util.internal.logging.InternalLogger;
+import io.netty.util.internal.logging.InternalLoggerFactory;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Timeout;
+
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+import static org.junit.jupiter.api.Assumptions.assumeTrue;
+
+public class EpollReuseAddrTest {
+    private static final InternalLogger LOGGER = InternalLoggerFactory.getInstance(EpollReuseAddrTest.class);
+
+    private static final int MAJOR;
+    private static final int MINOR;
+    private static final int BUGFIX;
+    static {
+        String kernelVersion = Native.KERNEL_VERSION;
+        int index = kernelVersion.indexOf('-');
+        if (index > -1) {
+            kernelVersion = kernelVersion.substring(0, index);
+        }
+        String[] versionParts = kernelVersion.split("\\.");
+        if (versionParts.length <= 3) {
+            MAJOR = Integer.parseInt(versionParts[0]);
+            MINOR = Integer.parseInt(versionParts[1]);
+            if (versionParts.length == 3) {
+                int bugFix;
+                try {
+                    bugFix = Integer.parseInt(versionParts[2]);
+                } catch (NumberFormatException ignore) {
+                    // the last part of the version may include all kind of different things. Especially when
+                    // someone compiles his / her own kernel.
+                    // Just ignore a parse error here and use 0.
+                    bugFix = 0;
+                }
+                BUGFIX = bugFix;
+            } else {
+                BUGFIX = 0;
+            }
+        } else {
+            LOGGER.log(InternalLogLevel.INFO, "Unable to parse kernel version: " + kernelVersion);
+            MAJOR = 0;
+            MINOR = 0;
+            BUGFIX = 0;
+        }
+    }
+
+    @Test
+    public void testMultipleBindSocketChannelWithoutReusePortFails() {
+        assumeTrue(versionEqOrGt(3, 9, 0));
+        testMultipleBindDatagramChannelWithoutReusePortFails0(createServerBootstrap());
+    }
+
+    @Test
+    public void testMultipleBindDatagramChannelWithoutReusePortFails() {
+        assumeTrue(versionEqOrGt(3, 9, 0));
+        testMultipleBindDatagramChannelWithoutReusePortFails0(createBootstrap());
+    }
+
+    private static void testMultipleBindDatagramChannelWithoutReusePortFails0(AbstractBootstrap<?, ?> bootstrap) {
+        bootstrap.handler(new LoggingHandler(LogLevel.ERROR));
+        ChannelFuture future = bootstrap.bind().syncUninterruptibly();
+        try {
+            bootstrap.bind(future.channel().localAddress()).syncUninterruptibly();
+            fail();
+        } catch (Exception e) {
+            assertTrue(e instanceof IOException);
+        }
+        future.channel().close().syncUninterruptibly();
+    }
+
+    @Test
+    @Timeout(value = 10000, unit = TimeUnit.MILLISECONDS)
+    public void testMultipleBindSocketChannel() throws Exception {
+        assumeTrue(versionEqOrGt(3, 9, 0));
+        ServerBootstrap bootstrap = createServerBootstrap();
+        bootstrap.option(EpollChannelOption.SO_REUSEPORT, true);
+        final AtomicBoolean accepted1 = new AtomicBoolean();
+        bootstrap.childHandler(new ServerSocketTestHandler(accepted1));
+        ChannelFuture future = bootstrap.bind().syncUninterruptibly();
+        InetSocketAddress address1 = (InetSocketAddress) future.channel().localAddress();
+
+        final AtomicBoolean accepted2 = new AtomicBoolean();
+        bootstrap.childHandler(new ServerSocketTestHandler(accepted2));
+        ChannelFuture future2 = bootstrap.bind(address1).syncUninterruptibly();
+        InetSocketAddress address2 = (InetSocketAddress) future2.channel().localAddress();
+
+        assertEquals(address1, address2);
+        while (!accepted1.get() || !accepted2.get()) {
+            Socket socket = new Socket(address1.getAddress(), address1.getPort());
+            socket.setReuseAddress(true);
+            socket.close();
+        }
+        future.channel().close().syncUninterruptibly();
+        future2.channel().close().syncUninterruptibly();
+    }
+
+    @Test
+    @Timeout(value = 10000, unit = TimeUnit.MILLISECONDS)
+    @Disabled // TODO: Unignore after making it pass on centos6-1 and debian7-1
+    public void testMultipleBindDatagramChannel() throws Exception {
+        ResourceLeakDetector.setLevel(ResourceLeakDetector.Level.ADVANCED);
+        assumeTrue(versionEqOrGt(3, 9, 0));
+        Bootstrap bootstrap = createBootstrap();
+        bootstrap.option(EpollChannelOption.SO_REUSEPORT, true);
+        final AtomicBoolean received1 = new AtomicBoolean();
+        bootstrap.handler(new DatagramSocketTestHandler(received1));
+        ChannelFuture future = bootstrap.bind().syncUninterruptibly();
+        final InetSocketAddress address1 = (InetSocketAddress) future.channel().localAddress();
+
+        final AtomicBoolean received2 = new AtomicBoolean();
+        bootstrap.handler(new DatagramSocketTestHandler(received2));
+        ChannelFuture future2 = bootstrap.bind(address1).syncUninterruptibly();
+        final InetSocketAddress address2 = (InetSocketAddress) future2.channel().localAddress();
+
+        assertEquals(address1, address2);
+        final byte[] bytes = "data".getBytes();
+
+        // fire up 16 Threads and send DatagramPackets to make sure we stress it enough to see DatagramPackets received
+        // on both sockets.
+        int count = 16;
+        final CountDownLatch latch = new CountDownLatch(count);
+        Runnable r = new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    DatagramSocket socket = new DatagramSocket();
+                    while (!received1.get() || !received2.get()) {
+                        socket.send(new DatagramPacket(
+                                bytes, 0, bytes.length, address1.getAddress(), address1.getPort()));
+                    }
+                    socket.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+                latch.countDown();
+            }
+        };
+
+        ExecutorService executor = Executors.newFixedThreadPool(count);
+        for (int i = 0 ; i < count; i++) {
+            executor.execute(r);
+        }
+        latch.await();
+        executor.shutdown();
+        future.channel().close().syncUninterruptibly();
+        future2.channel().close().syncUninterruptibly();
+        assertTrue(received1.get());
+        assertTrue(received2.get());
+    }
+
+    private static ServerBootstrap createServerBootstrap() {
+        ServerBootstrap bootstrap = new ServerBootstrap();
+        bootstrap.group(EpollSocketTestPermutation.EPOLL_BOSS_GROUP, EpollSocketTestPermutation.EPOLL_WORKER_GROUP);
+        bootstrap.channel(EpollServerSocketChannel.class);
+        bootstrap.childHandler(new DummyHandler());
+        InetSocketAddress address = new InetSocketAddress(NetUtil.LOCALHOST, 0);
+        bootstrap.localAddress(address);
+        return bootstrap;
+    }
+
+    private static Bootstrap createBootstrap() {
+        Bootstrap bootstrap = new Bootstrap();
+        bootstrap.group(EpollSocketTestPermutation.EPOLL_WORKER_GROUP);
+        bootstrap.channel(EpollDatagramChannel.class);
+        InetSocketAddress address = new InetSocketAddress(NetUtil.LOCALHOST, 0);
+        bootstrap.localAddress(address);
+        return bootstrap;
+    }
+
+    private static boolean versionEqOrGt(int major, int minor, int bugfix)  {
+        if (MAJOR > major) {
+            return true;
+        }
+        if (MAJOR == major) {
+            if (MINOR > minor) {
+                return true;
+            } else if (MINOR == minor) {
+                if (BUGFIX >= bugfix) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
+    @ChannelHandler.Sharable
+    private static class ServerSocketTestHandler extends ChannelInboundHandlerAdapter {
+        private final AtomicBoolean accepted;
+
+        ServerSocketTestHandler(AtomicBoolean accepted) {
+            this.accepted = accepted;
+        }
+
+        @Override
+        public void channelActive(ChannelHandlerContext ctx) throws Exception {
+            accepted.set(true);
+            ctx.close();
+        }
+    }
+
+    @ChannelHandler.Sharable
+    private static class DatagramSocketTestHandler extends ChannelInboundHandlerAdapter {
+        private final AtomicBoolean received;
+
+        DatagramSocketTestHandler(AtomicBoolean received) {
+            this.received = received;
+        }
+
+        @Override
+        public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+            ReferenceCountUtil.release(msg);
+            received.set(true);
+        }
+    }
+
+    @ChannelHandler.Sharable
+    private static final class DummyHandler extends ChannelHandlerAdapter { }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollServerSocketChannelConfigTest.java

@@ -0,0 +1,103 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.channel.ChannelOption;
+import io.netty.channel.EventLoopGroup;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.function.Executable;
+
+import java.net.InetSocketAddress;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class EpollServerSocketChannelConfigTest {
+
+    private static EventLoopGroup group;
+    private static EpollServerSocketChannel ch;
+
+    @BeforeAll
+    public static void before() {
+        group = new EpollEventLoopGroup(1);
+        ServerBootstrap bootstrap = new ServerBootstrap();
+        ch = (EpollServerSocketChannel) bootstrap.group(group)
+                .channel(EpollServerSocketChannel.class)
+                .childHandler(new ChannelInboundHandlerAdapter())
+                .bind(new InetSocketAddress(0)).syncUninterruptibly().channel();
+    }
+
+    @AfterAll
+    public static void after() {
+        try {
+            ch.close().syncUninterruptibly();
+        } finally {
+            group.shutdownGracefully();
+        }
+    }
+
+    @Test
+    public void testTcpDeferAccept() {
+        ch.config().setTcpDeferAccept(0);
+        assertEquals(0, ch.config().getTcpDeferAccept());
+        ch.config().setTcpDeferAccept(10);
+        // The returned value may be bigger then what we set.
+        // See https://www.spinics.net/lists/netdev/msg117330.html
+        assertTrue(10 <= ch.config().getTcpDeferAccept());
+    }
+
+    @Test
+    public void testReusePort() {
+        ch.config().setReusePort(false);
+        assertFalse(ch.config().isReusePort());
+        ch.config().setReusePort(true);
+        assertTrue(ch.config().isReusePort());
+    }
+
+    @Test
+    public void testFreeBind() {
+        ch.config().setFreeBind(false);
+        assertFalse(ch.config().isFreeBind());
+        ch.config().setFreeBind(true);
+        assertTrue(ch.config().isFreeBind());
+    }
+
+    @Test
+    public void getGetOptions() {
+        Map<ChannelOption<?>, Object> map = ch.config().getOptions();
+        assertFalse(map.isEmpty());
+    }
+
+    @Test
+    public void testFastOpen() {
+        assertThrows(IllegalArgumentException.class, new Executable() {
+            @Override
+            public void execute() {
+                ch.config().setTcpFastopen(-1);
+            }
+        });
+        ch.config().setTcpFastopen(10);
+        assertEquals(10, ch.config().getTcpFastopen());
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketAddressesTest.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2023 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketAddressesTest;
+
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class EpollSocketAddressesTest extends SocketAddressesTest {
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+
+    @Override
+    protected void assertAddress(SocketAddress address) {
+        assertTrue(((InetSocketAddress) address).getPort() > 0);
+        assertFalse(((InetSocketAddress) address).getAddress().isAnyLocalAddress());
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketChannelConfigTest.java

@@ -0,0 +1,178 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.github.artsok.RepeatedIfExceptionsTest;
+import io.netty.bootstrap.Bootstrap;
+import io.netty.channel.ChannelException;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.channel.ChannelOption;
+import io.netty.channel.EventLoopGroup;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.function.Executable;
+import org.opentest4j.TestAbortedException;
+
+import java.net.InetSocketAddress;
+import java.nio.channels.ClosedChannelException;
+import java.util.Map;
+import java.util.Random;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+
+public class EpollSocketChannelConfigTest {
+
+    private static EventLoopGroup group;
+    private static EpollSocketChannel ch;
+    private static Random rand;
+
+    @BeforeAll
+    public static void beforeClass() {
+        rand = new Random();
+        group = new EpollEventLoopGroup(1);
+    }
+
+    @AfterAll
+    public static void afterClass() {
+        group.shutdownGracefully();
+    }
+
+    @BeforeEach
+    public void setup() {
+        Bootstrap bootstrap = new Bootstrap();
+        ch = (EpollSocketChannel) bootstrap.group(group)
+                .channel(EpollSocketChannel.class)
+                .handler(new ChannelInboundHandlerAdapter())
+                .bind(new InetSocketAddress(0)).syncUninterruptibly().channel();
+    }
+
+    @AfterEach
+    public void teardown() {
+        ch.close().syncUninterruptibly();
+    }
+
+    private static long randLong(long min, long max) {
+        return min + nextLong(max - min + 1);
+    }
+
+    private static long nextLong(long n) {
+        long bits, val;
+        do {
+           bits = (rand.nextLong() << 1) >>> 1;
+           val = bits % n;
+        } while (bits - val + (n - 1) < 0L);
+        return val;
+     }
+
+    @Test
+    public void testRandomTcpNotSentLowAt() {
+        final long expected = randLong(0, 0xFFFFFFFFL);
+        final long actual;
+        try {
+            ch.config().setTcpNotSentLowAt(expected);
+            actual = ch.config().getTcpNotSentLowAt();
+        } catch (RuntimeException e) {
+            throw new TestAbortedException("assumeNoException", e);
+        }
+        assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testInvalidHighTcpNotSentLowAt() {
+        try {
+            final long value = 0xFFFFFFFFL + 1;
+            ch.config().setTcpNotSentLowAt(value);
+        } catch (IllegalArgumentException e) {
+            return;
+        } catch (RuntimeException e) {
+            throw new TestAbortedException("assumeNoException", e);
+        }
+        fail();
+    }
+
+    @Test
+    public void testInvalidLowTcpNotSentLowAt() {
+        try {
+            final long value = -1;
+            ch.config().setTcpNotSentLowAt(value);
+        } catch (IllegalArgumentException e) {
+            return;
+        } catch (RuntimeException e) {
+            throw new TestAbortedException("assumeNoException", e);
+        }
+        fail();
+    }
+
+    @Test
+    public void testTcpCork() {
+        ch.config().setTcpCork(false);
+        assertFalse(ch.config().isTcpCork());
+        ch.config().setTcpCork(true);
+        assertTrue(ch.config().isTcpCork());
+    }
+
+    @Test
+    public void testTcpQickAck() {
+        ch.config().setTcpQuickAck(false);
+        assertFalse(ch.config().isTcpQuickAck());
+        ch.config().setTcpQuickAck(true);
+        assertTrue(ch.config().isTcpQuickAck());
+    }
+
+    // For this test to pass, we are relying on the sockets file descriptor not being reused after the socket is closed.
+    // This is inherently racy, so we allow getSoLinger to throw ChannelException a few of times, but eventually we do
+    // want to see a ClosedChannelException for the test to pass.
+    @RepeatedIfExceptionsTest(repeats = 4)
+    public void testSetOptionWhenClosed() {
+        ch.close().syncUninterruptibly();
+        ChannelException e = assertThrows(ChannelException.class, new Executable() {
+            @Override
+            public void execute() throws Throwable {
+                ch.config().setSoLinger(0);
+            }
+        });
+        assertThat(e).hasCauseInstanceOf(ClosedChannelException.class);
+    }
+
+    // For this test to pass, we are relying on the sockets file descriptor not being reused after the socket is closed.
+    // This is inherently racy, so we allow getSoLinger to throw ChannelException a few of times, but eventually we do
+    // want to see a ClosedChannelException for the test to pass.
+    @RepeatedIfExceptionsTest(repeats = 4)
+    public void testGetOptionWhenClosed() {
+        ch.close().syncUninterruptibly();
+        ChannelException e = assertThrows(ChannelException.class, new Executable() {
+            @Override
+            public void execute() throws Throwable {
+                ch.config().getSoLinger();
+            }
+        });
+        assertThat(e).hasCauseInstanceOf(ClosedChannelException.class);
+    }
+
+    @Test
+    public void getGetOptions() {
+        Map<ChannelOption<?>, Object> map = ch.config().getOptions();
+        assertFalse(map.isEmpty());
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketChannelNotYetConnectedTest.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketChannelNotYetConnectedTest;
+
+import java.util.List;
+
+public class EpollSocketChannelNotYetConnectedTest extends SocketChannelNotYetConnectedTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapFactory<Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.clientSocketWithFastOpen();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketChannelTest.java

@@ -0,0 +1,123 @@
+/*
+ * Copyright 2014 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.channel.ChannelOption;
+import io.netty.channel.EventLoopGroup;
+
+import org.junit.jupiter.api.Test;
+
+import java.net.InetSocketAddress;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class EpollSocketChannelTest {
+
+    @Test
+    public void testTcpInfo() throws Exception {
+        EventLoopGroup group = new EpollEventLoopGroup(1);
+
+        try {
+            Bootstrap bootstrap = new Bootstrap();
+            EpollSocketChannel ch = (EpollSocketChannel) bootstrap.group(group)
+                    .channel(EpollSocketChannel.class)
+                    .handler(new ChannelInboundHandlerAdapter())
+                    .bind(new InetSocketAddress(0)).syncUninterruptibly().channel();
+            EpollTcpInfo info = ch.tcpInfo();
+            assertTcpInfo0(info);
+            ch.close().syncUninterruptibly();
+        } finally {
+            group.shutdownGracefully();
+        }
+    }
+
+    @Test
+    public void testTcpInfoReuse() throws Exception {
+        EventLoopGroup group = new EpollEventLoopGroup(1);
+
+        try {
+            Bootstrap bootstrap = new Bootstrap();
+            EpollSocketChannel ch = (EpollSocketChannel) bootstrap.group(group)
+                    .channel(EpollSocketChannel.class)
+                    .handler(new ChannelInboundHandlerAdapter())
+                    .bind(new InetSocketAddress(0)).syncUninterruptibly().channel();
+            EpollTcpInfo info = new EpollTcpInfo();
+            ch.tcpInfo(info);
+            assertTcpInfo0(info);
+            ch.close().syncUninterruptibly();
+        } finally {
+            group.shutdownGracefully();
+        }
+    }
+
+    private static void assertTcpInfo0(EpollTcpInfo info) throws Exception {
+        assertNotNull(info);
+
+        assertTrue(info.state() >= 0);
+        assertTrue(info.caState() >= 0);
+        assertTrue(info.retransmits() >= 0);
+        assertTrue(info.probes() >= 0);
+        assertTrue(info.backoff() >= 0);
+        assertTrue(info.options() >= 0);
+        assertTrue(info.sndWscale() >= 0);
+        assertTrue(info.rcvWscale() >= 0);
+        assertTrue(info.rto() >= 0);
+        assertTrue(info.ato() >= 0);
+        assertTrue(info.sndMss() >= 0);
+        assertTrue(info.rcvMss() >= 0);
+        assertTrue(info.unacked() >= 0);
+        assertTrue(info.sacked() >= 0);
+        assertTrue(info.lost() >= 0);
+        assertTrue(info.retrans() >= 0);
+        assertTrue(info.fackets() >= 0);
+        assertTrue(info.lastDataSent() >= 0);
+        assertTrue(info.lastAckSent() >= 0);
+        assertTrue(info.lastDataRecv() >= 0);
+        assertTrue(info.lastAckRecv() >= 0);
+        assertTrue(info.pmtu() >= 0);
+        assertTrue(info.rcvSsthresh() >= 0);
+        assertTrue(info.rtt() >= 0);
+        assertTrue(info.rttvar() >= 0);
+        assertTrue(info.sndSsthresh() >= 0);
+        assertTrue(info.sndCwnd() >= 0);
+        assertTrue(info.advmss() >= 0);
+        assertTrue(info.reordering() >= 0);
+        assertTrue(info.rcvRtt() >= 0);
+        assertTrue(info.rcvSpace() >= 0);
+        assertTrue(info.totalRetrans() >= 0);
+    }
+
+    // See https://github.com/netty/netty/issues/7159
+    @Test
+    public void testSoLingerNoAssertError() throws Exception {
+        EventLoopGroup group = new EpollEventLoopGroup(1);
+
+        try {
+            Bootstrap bootstrap = new Bootstrap();
+            EpollSocketChannel ch = (EpollSocketChannel) bootstrap.group(group)
+                    .channel(EpollSocketChannel.class)
+                    .option(ChannelOption.SO_LINGER, 10)
+                    .handler(new ChannelInboundHandlerAdapter())
+                    .bind(new InetSocketAddress(0)).syncUninterruptibly().channel();
+            ch.close().syncUninterruptibly();
+        } finally {
+            group.shutdownGracefully();
+        }
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketCloseForciblyTest.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2017 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketCloseForciblyTest;
+
+import java.util.List;
+
+public class EpollSocketCloseForciblyTest extends SocketCloseForciblyTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithoutFastOpen();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketConnectTest.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketConnectTest;
+
+import java.util.List;
+
+public class EpollSocketConnectTest extends SocketConnectTest {
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithoutFastOpen();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketConnectionAttemptTest.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketConnectionAttemptTest;
+
+import java.util.List;
+
+public class EpollSocketConnectionAttemptTest extends SocketConnectionAttemptTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapFactory<Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.clientSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketEchoTest.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2014 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketEchoTest;
+
+import java.util.List;
+
+public class EpollSocketEchoTest extends SocketEchoTest {
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketFileRegionTest.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2014 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketFileRegionTest;
+
+import java.util.List;
+
+public class EpollSocketFileRegionTest extends SocketFileRegionTest {
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketFixedLengthEchoTest.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2014 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketFixedLengthEchoTest;
+
+import java.util.List;
+
+public class EpollSocketFixedLengthEchoTest extends SocketFixedLengthEchoTest {
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketGatheringWriteTest.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2014 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketGatheringWriteTest;
+
+import java.util.List;
+
+public class EpollSocketGatheringWriteTest extends SocketGatheringWriteTest {
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithoutFastOpen();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketMultipleConnectTest.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.nio.NioEventLoopGroup;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketMultipleConnectTest;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class EpollSocketMultipleConnectTest extends SocketMultipleConnectTest {
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> factories
+                = new ArrayList<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>>();
+        for (TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap> comboFactory
+                : EpollSocketTestPermutation.INSTANCE.socketWithFastOpen()) {
+            EventLoopGroup group = comboFactory.newClientInstance().config().group();
+            if (group instanceof NioEventLoopGroup || group instanceof EpollEventLoopGroup) {
+                factories.add(comboFactory);
+            }
+        }
+        return factories;
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketObjectEchoTest.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2014 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketObjectEchoTest;
+
+import java.util.List;
+
+public class EpollSocketObjectEchoTest extends SocketObjectEchoTest {
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketRstTest.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.Channel;
+import io.netty.channel.unix.Errors;
+import io.netty.channel.unix.Errors.NativeIoException;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketRstTest;
+
+import java.io.IOException;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class EpollSocketRstTest extends SocketRstTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithoutFastOpen();
+    }
+
+    @Override
+    protected void assertRstOnCloseException(IOException cause, Channel clientChannel) {
+        if (!AbstractEpollChannel.class.isInstance(clientChannel)) {
+            super.assertRstOnCloseException(cause, clientChannel);
+            return;
+        }
+
+        assertTrue(cause instanceof NativeIoException,
+            "actual [type, message]: [" + cause.getClass() + ", " + cause.getMessage() + "]");
+        assertEquals(Errors.ERRNO_ECONNRESET_NEGATIVE, ((NativeIoException) cause).expectedErr());
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketShutdownOutputByPeerTest.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketShutdownOutputByPeerTest;
+
+import java.util.List;
+
+public class EpollSocketShutdownOutputByPeerTest extends SocketShutdownOutputByPeerTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapFactory<ServerBootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.serverSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketShutdownOutputBySelfTest.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketShutdownOutputBySelfTest;
+
+import java.util.List;
+
+public class EpollSocketShutdownOutputBySelfTest extends SocketShutdownOutputBySelfTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapFactory<Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.clientSocket();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketSslClientRenegotiateTest.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2019 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketSslClientRenegotiateTest;
+
+import java.util.List;
+
+public class EpollSocketSslClientRenegotiateTest extends SocketSslClientRenegotiateTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketSslEchoTest.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2014 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketSslEchoTest;
+
+import java.util.List;
+
+public class EpollSocketSslEchoTest extends SocketSslEchoTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketSslGreetingTest.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2014 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketSslGreetingTest;
+
+import java.util.List;
+
+public class EpollSocketSslGreetingTest extends SocketSslGreetingTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketSslSessionReuseTest.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2019 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketSslSessionReuseTest;
+
+import java.util.List;
+
+public class EpollSocketSslSessionReuseTest extends SocketSslSessionReuseTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketStartTlsTest.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2014 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketStartTlsTest;
+
+import java.util.List;
+
+public class EpollSocketStartTlsTest extends SocketStartTlsTest {
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketStringEchoBusyWaitTest.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2018 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.SelectStrategy;
+import io.netty.channel.SelectStrategyFactory;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.TestsuitePermutation.BootstrapComboFactory;
+import io.netty.testsuite.transport.TestsuitePermutation.BootstrapFactory;
+import io.netty.testsuite.transport.socket.SocketStringEchoTest;
+import io.netty.util.IntSupplier;
+import io.netty.util.concurrent.DefaultThreadFactory;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class EpollSocketStringEchoBusyWaitTest extends SocketStringEchoTest {
+
+    private static EventLoopGroup EPOLL_LOOP;
+
+    @BeforeAll
+    public static void setup() throws Exception {
+        EPOLL_LOOP = new EpollEventLoopGroup(2, new DefaultThreadFactory("testsuite-epoll-busy-wait", true),
+                new SelectStrategyFactory() {
+                    @Override
+                    public SelectStrategy newSelectStrategy() {
+                        return new SelectStrategy() {
+                            @Override
+                            public int calculateStrategy(IntSupplier selectSupplier, boolean hasTasks) {
+                                return SelectStrategy.BUSY_WAIT;
+                            }
+                        };
+                    }
+                });
+    }
+
+    @AfterAll
+    public static void teardown() throws Exception {
+        if (EPOLL_LOOP != null) {
+            EPOLL_LOOP.shutdownGracefully();
+        }
+    }
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        List<BootstrapComboFactory<ServerBootstrap, Bootstrap>> list =
+                new ArrayList<BootstrapComboFactory<ServerBootstrap, Bootstrap>>();
+        final BootstrapFactory<ServerBootstrap> sbf = serverSocket();
+        final BootstrapFactory<Bootstrap> cbf = clientSocket();
+        list.add(new BootstrapComboFactory<ServerBootstrap, Bootstrap>() {
+            @Override
+            public ServerBootstrap newServerInstance() {
+                return sbf.newInstance();
+            }
+
+            @Override
+            public Bootstrap newClientInstance() {
+                return cbf.newInstance();
+            }
+        });
+
+        return list;
+    }
+
+    private static BootstrapFactory<ServerBootstrap> serverSocket() {
+        return new BootstrapFactory<ServerBootstrap>() {
+            @Override
+            public ServerBootstrap newInstance() {
+                return new ServerBootstrap().group(EPOLL_LOOP, EPOLL_LOOP).channel(EpollServerSocketChannel.class);
+            }
+        };
+    }
+
+    private static BootstrapFactory<Bootstrap> clientSocket() {
+        return new BootstrapFactory<Bootstrap>() {
+            @Override
+            public Bootstrap newInstance() {
+                return new Bootstrap().group(EPOLL_LOOP).channel(EpollSocketChannel.class);
+            }
+        };
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketStringEchoTest.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2014 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.SocketStringEchoTest;
+
+import java.util.List;
+
+public class EpollSocketStringEchoTest extends SocketStringEchoTest {
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.socketWithFastOpen();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketTcpMd5Test.java

@@ -0,0 +1,123 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.channel.ChannelOption;
+import io.netty.channel.ConnectTimeoutException;
+import io.netty.channel.EventLoopGroup;
+import io.netty.util.CharsetUtil;
+import io.netty.util.NetUtil;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.function.Executable;
+
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.util.Collections;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+public class EpollSocketTcpMd5Test {
+    private static final byte[] SERVER_KEY = "abc".getBytes(CharsetUtil.US_ASCII);
+    private static final byte[] BAD_KEY = "def".getBytes(CharsetUtil.US_ASCII);
+    private static EventLoopGroup GROUP;
+    private EpollServerSocketChannel server;
+
+    @BeforeAll
+    public static void beforeClass() {
+        GROUP = new EpollEventLoopGroup(1);
+    }
+
+    @AfterAll
+    public static void afterClass() {
+        GROUP.shutdownGracefully();
+    }
+
+    @BeforeEach
+    public void setup() {
+        Bootstrap bootstrap = new Bootstrap();
+        server = (EpollServerSocketChannel) bootstrap.group(GROUP)
+                .channel(EpollServerSocketChannel.class)
+                .handler(new ChannelInboundHandlerAdapter())
+                .bind(new InetSocketAddress(NetUtil.LOCALHOST4, 0)).syncUninterruptibly().channel();
+    }
+
+    @AfterEach
+    public void teardown() {
+        server.close().syncUninterruptibly();
+    }
+
+    @Test
+    public void testServerSocketChannelOption() throws Exception {
+        server.config().setOption(EpollChannelOption.TCP_MD5SIG,
+                Collections.<InetAddress, byte[]>singletonMap(NetUtil.LOCALHOST4, SERVER_KEY));
+        server.config().setOption(EpollChannelOption.TCP_MD5SIG, Collections.<InetAddress, byte[]>emptyMap());
+    }
+
+    @Test
+    public void testServerOption() throws Exception {
+        Bootstrap bootstrap = new Bootstrap();
+        EpollServerSocketChannel ch = (EpollServerSocketChannel) bootstrap.group(GROUP)
+                .channel(EpollServerSocketChannel.class)
+                .handler(new ChannelInboundHandlerAdapter())
+                .bind(new InetSocketAddress(0)).syncUninterruptibly().channel();
+
+        ch.config().setOption(EpollChannelOption.TCP_MD5SIG,
+                Collections.<InetAddress, byte[]>singletonMap(NetUtil.LOCALHOST4, SERVER_KEY));
+        ch.config().setOption(EpollChannelOption.TCP_MD5SIG, Collections.<InetAddress, byte[]>emptyMap());
+
+        ch.close().syncUninterruptibly();
+    }
+
+    @Test
+    public void testKeyMismatch() throws Exception {
+        server.config().setOption(EpollChannelOption.TCP_MD5SIG,
+                Collections.<InetAddress, byte[]>singletonMap(NetUtil.LOCALHOST4, SERVER_KEY));
+
+        assertThrows(ConnectTimeoutException.class, new Executable() {
+            @Override
+            public void execute() throws Throwable {
+                EpollSocketChannel client = (EpollSocketChannel) new Bootstrap().group(GROUP)
+                        .channel(EpollSocketChannel.class)
+                        .handler(new ChannelInboundHandlerAdapter())
+                        .option(EpollChannelOption.TCP_MD5SIG,
+                                Collections.<InetAddress, byte[]>singletonMap(NetUtil.LOCALHOST4, BAD_KEY))
+                        .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 1000)
+                        .connect(server.localAddress()).syncUninterruptibly().channel();
+                client.close().syncUninterruptibly();
+            }
+        });
+    }
+
+    @Test
+    public void testKeyMatch() throws Exception {
+        server.config().setOption(EpollChannelOption.TCP_MD5SIG,
+                Collections.<InetAddress, byte[]>singletonMap(NetUtil.LOCALHOST4, SERVER_KEY));
+
+        EpollSocketChannel client = (EpollSocketChannel) new Bootstrap().group(GROUP)
+                .channel(EpollSocketChannel.class)
+                .handler(new ChannelInboundHandlerAdapter())
+                .option(EpollChannelOption.TCP_MD5SIG,
+                        Collections.<InetAddress, byte[]>singletonMap(NetUtil.LOCALHOST4, SERVER_KEY))
+                .connect(server.localAddress()).syncUninterruptibly().channel();
+        client.close().syncUninterruptibly();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketTest.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2016 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.channel.unix.DomainSocketAddress;
+import io.netty.channel.unix.PeerCredentials;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class EpollSocketTest extends SocketTest<LinuxSocket> {
+    @BeforeAll
+    public static void loadJNI() {
+        Epoll.ensureAvailability();
+    }
+
+    @Test
+    public void testTcpCork() throws Exception {
+        assertFalse(socket.isTcpCork());
+        socket.setTcpCork(true);
+        assertTrue(socket.isTcpCork());
+    }
+
+    @Test
+    public void testPeerCreds() throws IOException {
+        LinuxSocket s1 = LinuxSocket.newSocketDomain();
+        LinuxSocket s2 = LinuxSocket.newSocketDomain();
+
+        try {
+            DomainSocketAddress dsa = UnixTestUtils.newDomainSocketAddress();
+            s1.bind(dsa);
+            s1.listen(1);
+
+            assertTrue(s2.connect(dsa));
+            byte [] addr = new byte[64];
+            s1.accept(addr);
+            PeerCredentials pc = s1.getPeerCredentials();
+            assertNotEquals(pc.uid(), -1);
+        } finally {
+            s1.close();
+            s2.close();
+        }
+    }
+
+    @Override
+    protected LinuxSocket newSocket() {
+        return LinuxSocket.newSocketStream();
+    }
+
+    @Override
+    protected int level() {
+        // Value for SOL_SOCKET
+        // See https://github.com/torvalds/linux/blob/v5.17/include/uapi/asm-generic/socket.h
+        return 1;
+    }
+
+    @Override
+    protected int optname() {
+        // Value for SO_REUSEADDR
+        // See https://github.com/torvalds/linux/blob/v5.17/include/uapi/asm-generic/socket.h
+        return 2;
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSocketTestPermutation.java

@@ -0,0 +1,264 @@
+/*
+ * Copyright 2014 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelFactory;
+import io.netty.channel.ChannelOption;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.socket.InternetProtocolFamily;
+import io.netty.channel.socket.nio.NioDatagramChannel;
+import io.netty.channel.socket.nio.NioServerSocketChannel;
+import io.netty.channel.socket.nio.NioSocketChannel;
+import io.netty.channel.unix.DomainSocketAddress;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.TestsuitePermutation.BootstrapFactory;
+import io.netty.testsuite.transport.socket.SocketTestPermutation;
+import io.netty.util.concurrent.DefaultThreadFactory;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import static io.netty.channel.epoll.Native.IS_SUPPORTING_TCP_FASTOPEN_CLIENT;
+import static io.netty.channel.epoll.Native.IS_SUPPORTING_TCP_FASTOPEN_SERVER;
+
+class EpollSocketTestPermutation extends SocketTestPermutation {
+
+    static final EpollSocketTestPermutation INSTANCE = new EpollSocketTestPermutation();
+
+    static final EventLoopGroup EPOLL_BOSS_GROUP =
+            new EpollEventLoopGroup(BOSSES, new DefaultThreadFactory("testsuite-epoll-boss", true));
+    static final EventLoopGroup EPOLL_WORKER_GROUP =
+            new EpollEventLoopGroup(WORKERS, new DefaultThreadFactory("testsuite-epoll-worker", true));
+
+    @Override
+    public List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> socket() {
+        List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> list =
+                combo(serverSocket(), clientSocketWithFastOpen());
+
+        list.remove(list.size() - 1); // Exclude NIO x NIO test
+
+        return list;
+    }
+
+    public List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> socketWithoutFastOpen() {
+        List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> list =
+                combo(serverSocket(), clientSocket());
+
+        list.remove(list.size() - 1); // Exclude NIO x NIO test
+
+        return list;
+    }
+
+    @Override
+    public List<BootstrapFactory<ServerBootstrap>> serverSocket() {
+        List<BootstrapFactory<ServerBootstrap>> toReturn = new ArrayList<BootstrapFactory<ServerBootstrap>>();
+        toReturn.add(new BootstrapFactory<ServerBootstrap>() {
+            @Override
+            public ServerBootstrap newInstance() {
+                return new ServerBootstrap().group(EPOLL_BOSS_GROUP, EPOLL_WORKER_GROUP)
+                                            .channel(EpollServerSocketChannel.class);
+            }
+        });
+        if (IS_SUPPORTING_TCP_FASTOPEN_SERVER) {
+            toReturn.add(new BootstrapFactory<ServerBootstrap>() {
+                @Override
+                public ServerBootstrap newInstance() {
+                    ServerBootstrap serverBootstrap = new ServerBootstrap().group(EPOLL_BOSS_GROUP, EPOLL_WORKER_GROUP)
+                                                                           .channel(EpollServerSocketChannel.class);
+                    serverBootstrap.option(ChannelOption.TCP_FASTOPEN, 5);
+                    return serverBootstrap;
+                }
+            });
+        }
+        toReturn.add(new BootstrapFactory<ServerBootstrap>() {
+            @Override
+            public ServerBootstrap newInstance() {
+                return new ServerBootstrap().group(nioBossGroup, nioWorkerGroup)
+                                            .channel(NioServerSocketChannel.class);
+            }
+        });
+
+        return toReturn;
+    }
+
+    @Override
+    public List<BootstrapFactory<Bootstrap>> clientSocket() {
+        List<BootstrapFactory<Bootstrap>> toReturn = new ArrayList<BootstrapFactory<Bootstrap>>();
+
+        toReturn.add(new BootstrapFactory<Bootstrap>() {
+            @Override
+            public Bootstrap newInstance() {
+                return new Bootstrap().group(EPOLL_WORKER_GROUP).channel(EpollSocketChannel.class);
+            }
+        });
+
+        toReturn.add(new BootstrapFactory<Bootstrap>() {
+            @Override
+            public Bootstrap newInstance() {
+                return new Bootstrap().group(nioWorkerGroup).channel(NioSocketChannel.class);
+            }
+        });
+
+        return toReturn;
+    }
+
+    @Override
+    public List<BootstrapFactory<Bootstrap>> clientSocketWithFastOpen() {
+        List<BootstrapFactory<Bootstrap>> factories = clientSocket();
+
+        if (IS_SUPPORTING_TCP_FASTOPEN_CLIENT) {
+            int insertIndex = factories.size() - 1; // Keep NIO fixture last.
+            factories.add(insertIndex, new BootstrapFactory<Bootstrap>() {
+                @Override
+                public Bootstrap newInstance() {
+                    return new Bootstrap().group(EPOLL_WORKER_GROUP).channel(EpollSocketChannel.class)
+                            .option(ChannelOption.TCP_FASTOPEN_CONNECT, true);
+                }
+            });
+        }
+
+        return factories;
+    }
+
+    @Override
+    public List<TestsuitePermutation.BootstrapComboFactory<Bootstrap, Bootstrap>> datagram(
+            final InternetProtocolFamily family) {
+        // Make the list of Bootstrap factories.
+        List<BootstrapFactory<Bootstrap>> bfs = Arrays.asList(
+                new BootstrapFactory<Bootstrap>() {
+                    @Override
+                    public Bootstrap newInstance() {
+                        return new Bootstrap().group(nioWorkerGroup).channelFactory(new ChannelFactory<Channel>() {
+                            @Override
+                            public Channel newChannel() {
+                                return new NioDatagramChannel(family);
+                            }
+
+                            @Override
+                            public String toString() {
+                                return NioDatagramChannel.class.getSimpleName() + ".class";
+                            }
+                        });
+                    }
+                },
+                new BootstrapFactory<Bootstrap>() {
+                    @Override
+                    public Bootstrap newInstance() {
+                        return new Bootstrap().group(EPOLL_WORKER_GROUP).channelFactory(new ChannelFactory<Channel>() {
+                            @Override
+                            public Channel newChannel() {
+                                return new EpollDatagramChannel(family);
+                            }
+
+                            @Override
+                            public String toString() {
+                                return InternetProtocolFamily.class.getSimpleName() + ".class";
+                            }
+                        });
+                    }
+                }
+        );
+        return combo(bfs, bfs);
+    }
+
+    List<TestsuitePermutation.BootstrapComboFactory<Bootstrap, Bootstrap>> epollOnlyDatagram(
+            final InternetProtocolFamily family) {
+        return combo(Collections.singletonList(datagramBootstrapFactory(family)),
+                Collections.singletonList(datagramBootstrapFactory(family)));
+    }
+
+    private static BootstrapFactory<Bootstrap> datagramBootstrapFactory(final InternetProtocolFamily family) {
+        return new BootstrapFactory<Bootstrap>() {
+            @Override
+            public Bootstrap newInstance() {
+                return new Bootstrap().group(EPOLL_WORKER_GROUP).channelFactory(new ChannelFactory<Channel>() {
+                    @Override
+                    public Channel newChannel() {
+                        return new EpollDatagramChannel(family);
+                    }
+
+                    @Override
+                    public String toString() {
+                        return InternetProtocolFamily.class.getSimpleName() + ".class";
+                    }
+                });
+            }
+        };
+    }
+
+    public List<TestsuitePermutation.BootstrapComboFactory<ServerBootstrap, Bootstrap>> domainSocket() {
+        return combo(serverDomainSocket(), clientDomainSocket());
+    }
+
+    public List<BootstrapFactory<ServerBootstrap>> serverDomainSocket() {
+        return Collections.<BootstrapFactory<ServerBootstrap>>singletonList(
+                new BootstrapFactory<ServerBootstrap>() {
+                    @Override
+                    public ServerBootstrap newInstance() {
+                        return new ServerBootstrap().group(EPOLL_BOSS_GROUP, EPOLL_WORKER_GROUP)
+                                .channel(EpollServerDomainSocketChannel.class);
+                    }
+                }
+        );
+    }
+
+    public List<BootstrapFactory<Bootstrap>> clientDomainSocket() {
+        return Collections.<BootstrapFactory<Bootstrap>>singletonList(
+                new BootstrapFactory<Bootstrap>() {
+                    @Override
+                    public Bootstrap newInstance() {
+                        return new Bootstrap().group(EPOLL_WORKER_GROUP).channel(EpollDomainSocketChannel.class);
+                    }
+                }
+        );
+    }
+
+    @Override
+    public List<BootstrapFactory<Bootstrap>> datagramSocket() {
+        return Collections.<BootstrapFactory<Bootstrap>>singletonList(
+                new BootstrapFactory<Bootstrap>() {
+                    @Override
+                    public Bootstrap newInstance() {
+                        return new Bootstrap().group(EPOLL_WORKER_GROUP).channel(EpollDatagramChannel.class);
+                    }
+                }
+        );
+    }
+
+    public List<TestsuitePermutation.BootstrapComboFactory<Bootstrap, Bootstrap>> domainDatagram() {
+        return combo(domainDatagramSocket(), domainDatagramSocket());
+    }
+
+    public List<BootstrapFactory<Bootstrap>> domainDatagramSocket() {
+        return Collections.<BootstrapFactory<Bootstrap>>singletonList(
+                new BootstrapFactory<Bootstrap>() {
+                    @Override
+                    public Bootstrap newInstance() {
+                        return new Bootstrap().group(EPOLL_WORKER_GROUP).channel(EpollDomainDatagramChannel.class);
+                    }
+                }
+        );
+    }
+
+    public static DomainSocketAddress newDomainSocketAddress() {
+        return UnixTestUtils.newDomainSocketAddress();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollSpliceTest.java

@@ -0,0 +1,313 @@
+/*
+ * Copyright 2015 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.bootstrap.ServerBootstrap;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.channel.EventLoopGroup;
+import io.netty.channel.SimpleChannelInboundHandler;
+import io.netty.channel.unix.FileDescriptor;
+import io.netty.util.NetUtil;
+import io.netty.util.internal.PlatformDependent;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Timeout;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.Random;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class EpollSpliceTest {
+
+    private static final int SPLICE_LEN = 32 * 1024;
+    private static final Random random = new Random();
+    private static final byte[] data = new byte[1048576];
+
+    static {
+        random.nextBytes(data);
+    }
+
+    @Test
+    public void spliceToSocket() throws Throwable {
+        final EchoHandler sh = new EchoHandler();
+        final EchoHandler ch = new EchoHandler();
+
+        EventLoopGroup group = new EpollEventLoopGroup(1);
+        ServerBootstrap bs = new ServerBootstrap();
+        bs.channel(EpollServerSocketChannel.class);
+        bs.group(group).childHandler(sh);
+        final Channel sc = bs.bind(NetUtil.LOCALHOST, 0).syncUninterruptibly().channel();
+
+        ServerBootstrap bs2 = new ServerBootstrap();
+        bs2.channel(EpollServerSocketChannel.class);
+        bs2.childOption(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+        bs2.group(group).childHandler(new ChannelInboundHandlerAdapter() {
+            @Override
+            public void channelActive(final ChannelHandlerContext ctx) throws Exception {
+                ctx.channel().config().setAutoRead(false);
+                Bootstrap bs = new Bootstrap();
+                bs.option(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+
+                bs.channel(EpollSocketChannel.class);
+                bs.group(ctx.channel().eventLoop()).handler(new ChannelInboundHandlerAdapter() {
+                    @Override
+                    public void channelActive(ChannelHandlerContext context) throws Exception {
+                        final EpollSocketChannel ch = (EpollSocketChannel) ctx.channel();
+                        final EpollSocketChannel ch2 = (EpollSocketChannel) context.channel();
+                        // We are splicing two channels together, at this point we have a tcp proxy which handles all
+                        // the data transfer only in kernel space!
+
+                        // Integer.MAX_VALUE will splice infinitely.
+                        ch.spliceTo(ch2, Integer.MAX_VALUE).addListener(new ChannelFutureListener() {
+                            @Override
+                            public void operationComplete(ChannelFuture future) throws Exception {
+                                if (!future.isSuccess()) {
+                                    future.channel().close();
+                                }
+                            }
+                        });
+                        // Trigger multiple splices to see if partial splicing works as well.
+                        ch2.spliceTo(ch, SPLICE_LEN).addListener(new ChannelFutureListener() {
+                            @Override
+                            public void operationComplete(ChannelFuture future) throws Exception {
+                                if (!future.isSuccess()) {
+                                    future.channel().close();
+                                } else {
+                                    ch2.spliceTo(ch, SPLICE_LEN).addListener(this);
+                                }
+                            }
+                        });
+                        ctx.channel().config().setAutoRead(true);
+                    }
+
+                    @Override
+                    public void channelInactive(ChannelHandlerContext context) throws Exception {
+                        context.close();
+                    }
+                });
+                bs.connect(sc.localAddress()).addListener(new ChannelFutureListener() {
+                    @Override
+                    public void operationComplete(ChannelFuture future) throws Exception {
+                        if (!future.isSuccess()) {
+                            ctx.close();
+                        } else {
+                            future.channel().closeFuture().addListener(new ChannelFutureListener() {
+                                @Override
+                                public void operationComplete(ChannelFuture future) throws Exception {
+                                    ctx.close();
+                                }
+                            });
+                        }
+                    }
+                });
+            }
+        });
+        Channel pc = bs2.bind(NetUtil.LOCALHOST, 0).syncUninterruptibly().channel();
+
+        Bootstrap cb = new Bootstrap();
+        cb.group(group);
+        cb.channel(EpollSocketChannel.class);
+        cb.handler(ch);
+        Channel cc = cb.connect(pc.localAddress()).syncUninterruptibly().channel();
+
+        for (int i = 0; i < data.length;) {
+            int length = Math.min(random.nextInt(1024 * 64), data.length - i);
+            ByteBuf buf = Unpooled.wrappedBuffer(data, i, length);
+            cc.writeAndFlush(buf);
+            i += length;
+        }
+
+        while (ch.counter < data.length) {
+            if (sh.exception.get() != null) {
+                break;
+            }
+            if (ch.exception.get() != null) {
+                break;
+            }
+
+            Thread.sleep(50);
+        }
+
+        while (sh.counter < data.length) {
+            if (sh.exception.get() != null) {
+                break;
+            }
+            if (ch.exception.get() != null) {
+                break;
+            }
+
+            Thread.sleep(50);
+        }
+
+        sh.channel.close().sync();
+        ch.channel.close().sync();
+        sc.close().sync();
+        pc.close().sync();
+        group.shutdownGracefully();
+
+        if (sh.exception.get() != null && !(sh.exception.get() instanceof IOException)) {
+            throw sh.exception.get();
+        }
+        if (ch.exception.get() != null && !(ch.exception.get() instanceof IOException)) {
+            throw ch.exception.get();
+        }
+        if (sh.exception.get() != null) {
+            throw sh.exception.get();
+        }
+        if (ch.exception.get() != null) {
+            throw ch.exception.get();
+        }
+    }
+
+    @Test
+    @Timeout(value = 10000, unit = TimeUnit.MILLISECONDS)
+    public void spliceToFile() throws Throwable {
+        EventLoopGroup group = new EpollEventLoopGroup(1);
+        File file = PlatformDependent.createTempFile("netty-splice", null, null);
+        file.deleteOnExit();
+
+        SpliceHandler sh = new SpliceHandler(file);
+        ServerBootstrap bs = new ServerBootstrap();
+        bs.channel(EpollServerSocketChannel.class);
+        bs.group(group).childHandler(sh);
+        bs.childOption(EpollChannelOption.EPOLL_MODE, EpollMode.LEVEL_TRIGGERED);
+        Channel sc = bs.bind(NetUtil.LOCALHOST, 0).syncUninterruptibly().channel();
+
+        Bootstrap cb = new Bootstrap();
+        cb.group(group);
+        cb.channel(EpollSocketChannel.class);
+        cb.handler(new ChannelInboundHandlerAdapter());
+        Channel cc = cb.connect(sc.localAddress()).syncUninterruptibly().channel();
+
+        for (int i = 0; i < data.length;) {
+            int length = Math.min(random.nextInt(1024 * 64), data.length - i);
+            ByteBuf buf = Unpooled.wrappedBuffer(data, i, length);
+            cc.writeAndFlush(buf);
+            i += length;
+        }
+
+        while (sh.future2 == null || !sh.future2.isDone() || !sh.future.isDone()) {
+            if (sh.exception.get() != null) {
+                break;
+            }
+            Thread.sleep(50);
+        }
+
+        sc.close().sync();
+        cc.close().sync();
+
+        if (sh.exception.get() != null && !(sh.exception.get() instanceof IOException)) {
+            throw sh.exception.get();
+        }
+
+        byte[] written = new byte[data.length];
+        FileInputStream in = new FileInputStream(file);
+
+        try {
+            assertEquals(written.length, in.read(written));
+            assertArrayEquals(data, written);
+        } finally {
+            in.close();
+            group.shutdownGracefully();
+        }
+    }
+
+    private static class EchoHandler extends SimpleChannelInboundHandler<ByteBuf> {
+        volatile Channel channel;
+        final AtomicReference<Throwable> exception = new AtomicReference<Throwable>();
+        volatile int counter;
+
+        @Override
+        public void channelActive(ChannelHandlerContext ctx)
+                throws Exception {
+            channel = ctx.channel();
+        }
+
+        @Override
+        public void channelRead0(ChannelHandlerContext ctx, ByteBuf in) throws Exception {
+            byte[] actual = new byte[in.readableBytes()];
+            in.readBytes(actual);
+
+            int lastIdx = counter;
+            for (int i = 0; i < actual.length; i ++) {
+                assertEquals(data[i + lastIdx], actual[i]);
+            }
+
+            if (channel.parent() != null) {
+                channel.write(Unpooled.wrappedBuffer(actual));
+            }
+
+            counter += actual.length;
+        }
+
+        @Override
+        public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
+            ctx.flush();
+        }
+
+        @Override
+        public void exceptionCaught(ChannelHandlerContext ctx,
+                                    Throwable cause) throws Exception {
+            if (exception.compareAndSet(null, cause)) {
+                cause.printStackTrace();
+                ctx.close();
+            }
+        }
+    }
+
+    private static class SpliceHandler extends ChannelInboundHandlerAdapter {
+        private final File file;
+
+        volatile ChannelFuture future;
+        volatile ChannelFuture future2;
+        final AtomicReference<Throwable> exception = new AtomicReference<Throwable>();
+
+        SpliceHandler(File file) {
+            this.file = file;
+        }
+
+        @Override
+        public void channelActive(ChannelHandlerContext ctx) throws Exception {
+            final EpollSocketChannel ch = (EpollSocketChannel) ctx.channel();
+            final FileDescriptor fd = FileDescriptor.from(file);
+
+            // splice two halves separately to test starting offset
+            future = ch.spliceTo(fd, 0, data.length / 2);
+            future2 = ch.spliceTo(fd, data.length / 2, data.length / 2);
+        }
+
+        @Override
+        public void exceptionCaught(ChannelHandlerContext ctx,
+                                    Throwable cause) throws Exception {
+            if (exception.compareAndSet(null, cause)) {
+                cause.printStackTrace();
+                ctx.close();
+            }
+        }
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollTest.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright 2019 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.channel.unix.FileDescriptor;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Timeout;
+
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class EpollTest {
+
+    @Test
+    public void testIsAvailable() {
+        assertTrue(Epoll.isAvailable());
+    }
+
+    // Testcase for https://github.com/netty/netty/issues/8444
+    @Test
+    @Timeout(value = 5000, unit = TimeUnit.MILLISECONDS)
+    public void testEpollWaitWithTimeOutMinusOne() throws Exception  {
+        final EpollEventArray eventArray = new EpollEventArray(8);
+        try {
+            final FileDescriptor epoll = Native.newEpollCreate();
+            final FileDescriptor timerFd = Native.newTimerFd();
+            final FileDescriptor eventfd = Native.newEventFd();
+            Native.epollCtlAdd(epoll.intValue(), timerFd.intValue(), Native.EPOLLIN);
+            Native.epollCtlAdd(epoll.intValue(), eventfd.intValue(), Native.EPOLLIN);
+
+            final AtomicReference<Throwable> ref = new AtomicReference<Throwable>();
+            Thread t = new Thread(new Runnable() {
+                @Override
+                public void run() {
+                    try {
+                        assertEquals(1, Native.epollWait(epoll, eventArray, false));
+                        // This should have been woken up because of eventfd_write.
+                        assertEquals(eventfd.intValue(), eventArray.fd(0));
+                    } catch (Throwable cause) {
+                        ref.set(cause);
+                    }
+                }
+            });
+            t.start();
+            t.join(1000);
+            assertTrue(t.isAlive());
+            Native.eventFdWrite(eventfd.intValue(), 1);
+
+            t.join();
+            assertNull(ref.get());
+            epoll.close();
+            timerFd.close();
+            eventfd.close();
+        } finally {
+            eventArray.free();
+        }
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/EpollWriteBeforeRegisteredTest.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2019 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.bootstrap.Bootstrap;
+import io.netty.testsuite.transport.TestsuitePermutation;
+import io.netty.testsuite.transport.socket.WriteBeforeRegisteredTest;
+
+import java.util.List;
+
+public class EpollWriteBeforeRegisteredTest extends WriteBeforeRegisteredTest {
+
+    @Override
+    protected List<TestsuitePermutation.BootstrapFactory<Bootstrap>> newFactories() {
+        return EpollSocketTestPermutation.INSTANCE.clientSocketWithFastOpen();
+    }
+}

netty-channel-epoll/src/test/java/io/netty/channel/epoll/IovArrayTest.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2020 The Netty Project
+ *
+ * The Netty Project licenses this file to you under the Apache License,
+ * version 2.0 (the "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+package io.netty.channel.epoll;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import io.netty.buffer.UnpooledByteBufAllocator;
+import io.netty.buffer.UnpooledDirectByteBuf;
+import io.netty.channel.unix.IovArray;
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public abstract class IovArrayTest {
+
+    @Test
+    public void testNotFailsWihtoutMemoryAddress() {
+        ByteBuf buffer = new NoMemoryAddressByteBuf(128);
+        IovArray array = new IovArray(buffer);
+
+        ByteBuf buf = Unpooled.directBuffer().writeZero(8);
+        ByteBuf buf2 = new NoMemoryAddressByteBuf(8).writeZero(8);
+        assertTrue(array.add(buf, 0, buf.readableBytes()));
+        assertTrue(array.add(buf, 0, buf2.readableBytes()));
+        assertEquals(2, array.count());
+        assertEquals(16, array.size());
+        assertTrue(buf.release());
+        assertTrue(buf2.release());
+        assertNotEquals(-1, array.memoryAddress(0));
+        array.release();
+        assertEquals(0, buffer.refCnt());
+    }
+
+    private static final class NoMemoryAddressByteBuf extends UnpooledDirectByteBuf {
+
+        NoMemoryAddressByteBuf(int capacity) {
+            super(UnpooledByteBufAllocator.DEFAULT, capacity, Integer.MAX_VALUE);
+        }
+
+        @Override
+        public boolean hasMemoryAddress() {
+            return false;
+        }
+
+        @Override
+        public long memoryAddress() {
+            throw new UnsupportedOperationException();
+        }
+    }
+}