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netty5/transport-native-epoll/src/main/c/netty_epoll_native.c
Norman Maurer 3add35fe82 Remove dependency on GLIBC 2.12 by using syscalls directly (#9797) 
Motivation:

394a1b3485 introduced a hard dependency on GLIBC 2.12 which was not the case before. This had the effect of not be able to use the native epoll transports on platforms which ship with earlier versions of GLIBC.
To make things a backward compatible as possible we should not introduce such changes in a bugfix release.

Special thanks to @weissi with all the help to fix this.

Modifications:

- Use syscalls directly to remove dependency on GLIBC 2.12
- Make code consistent that needs newer GLIBC versions
- Adjust scattering read test to only run if recvmmsg syscall is supported
- Cleanup pom.xml as some stuff is not needed anymore after using syscalls.

Result:

Fixes https://github.com/netty/netty/issues/9758.
2019-11-23 21:17:39 +01:00

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/*
* 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:
*
* http://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>
#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"
// 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
// optional
extern int epoll_create1(int flags) __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
#define SYS_recvmmsg 299
#endif
#ifndef SYS_sendmmsg
#define SYS_sendmmsg 307
#endif
// Those are initialized in the init(...) method and cached for performance reasons
static jfieldID packetAddrFieldId = NULL;
static jfieldID packetAddrLenFieldId = NULL;
static jfieldID packetScopeIdFieldId = NULL;
static jfieldID packetPortFieldId = NULL;
static jfieldID packetMemoryAddressFieldId = NULL;
static jfieldID packetCountFieldId = NULL;
// 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 http://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 void netty_epoll_native_timerFdRead(JNIEnv* env, jclass clazz, jint fd) {
uint64_t timerFireCount;
if (read(fd, &timerFireCount, sizeof(uint64_t)) < 0) {
// it is expected that this is only called where there is known to be activity, so this is an error.
netty_unix_errors_throwChannelExceptionErrorNo(env, "read() failed: ", errno);
}
}
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 method is deprecated!
static jint netty_epoll_native_epollWait0(JNIEnv* env, jclass clazz, jint efd, jlong address, jint len, jint timerFd, jint tvSec, jint tvNsec) {
if (tvSec == 0 && tvNsec == 0) {
// Zeros = poll (aka return immediately).
return netty_epoll_native_epollWait(env, clazz, efd, address, len, 0);
}
// only reschedule the timer if there is a newer event.
// -1 is a special value used by EpollEventLoop.
if (tvSec != ((jint) -1) && tvNsec != ((jint) -1)) {
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;
}
}
return netty_epoll_native_epollWait(env, clazz, efd, address, len, -1);
}
static inline void cpu_relax() {
#if defined(__x86_64__)
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];
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, packetAddrFieldId);
jint addrLen = (*env)->GetIntField(env, packet, packetAddrLenFieldId);
if (addrLen != 0) {
jint scopeId = (*env)->GetIntField(env, packet, packetScopeIdFieldId);
jint port = (*env)->GetIntField(env, packet, packetPortFieldId);
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 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 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;
}
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) {
return -err;
}
for (i = 0; i < res; i++) {
jobject packet = (*env)->GetObjectArrayElement(env, packets, i + offset);
jbyteArray address = (jbyteArray) (*env)->GetObjectField(env, packet, packetAddrFieldId);
(*env)->SetIntField(env, packet, packetCountFieldId, msg[i].msg_len);
struct sockaddr_storage* addr = (struct sockaddr_storage*) msg[i].msg_hdr.msg_name;
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, packetAddrLenFieldId, 4);
(*env)->SetIntField(env, packet, packetScopeIdFieldId, 0);
(*env)->SetIntField(env, packet, packetPortFieldId, 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
(*env)->SetByteArrayRegion(env, address, 12, 4, (jbyte*) &ip6addr->sin6_addr.s6_addr);
} else {
(*env)->SetByteArrayRegion(env, address, 0, 16, (jbyte*) &ip6addr->sin6_addr.s6_addr);
}
(*env)->SetIntField(env, packet, packetAddrLenFieldId, addrLen);
(*env)->SetIntField(env, packet, packetScopeIdFieldId, ip6addr->sin6_scope_id);
(*env)->SetIntField(env, packet, packetPortFieldId, ntohs(ip6addr->sin6_port));
}
}
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 (syscall(SYS_sendmmsg, -1, NULL, 0, 0) == -1) {
if (errno == ENOSYS) {
return JNI_FALSE;
}
}
return JNI_TRUE;
}
static jboolean netty_epoll_native_isSupportingRecvmmsg(JNIEnv* env, jclass clazz) {
if (syscall(SYS_recvmmsg, -1, NULL, 0, 0, NULL) == -1) {
if (errno == ENOSYS) {
return JNI_FALSE;
}
}
return JNI_TRUE;
}
static jboolean netty_epoll_native_isSupportingTcpFastopen(JNIEnv* env, jclass clazz) {
int fastopen = 0;
getSysctlValue("/proc/sys/net/ipv4/tcp_fastopen", &fastopen);
if (fastopen > 0) {
return JNI_TRUE;
}
return JNI_FALSE;
}
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;
}
// 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 },
{ "isSupportingTcpFastopen", "()Z", (void *) netty_epoll_native_isSupportingTcpFastopen },
{ "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 },
{ "timerFdRead", "(I)V", (void *) netty_epoll_native_timerFdRead },
{ "epollCreate", "()I", (void *) netty_epoll_native_epollCreate },
{ "epollWait0", "(IJIIII)I", (void *) netty_epoll_native_epollWait0 }, // This method is deprecated!
{ "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 }
};
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_PREPEND(packagePrefix, "io/netty/channel/epoll/NativeDatagramPacketArray$NativeDatagramPacket;II)I", dynamicTypeName, error);
NETTY_PREPEND("(IZ[L", dynamicTypeName, dynamicMethod->signature, error);
dynamicMethod->name = "sendmmsg0";
dynamicMethod->fnPtr = (void *) netty_epoll_native_sendmmsg0;
netty_unix_util_free_dynamic_name(&dynamicTypeName);
++dynamicMethod;
NETTY_PREPEND(packagePrefix, "io/netty/channel/epoll/NativeDatagramPacketArray$NativeDatagramPacket;II)I", dynamicTypeName, error);
NETTY_PREPEND("(IZ[L", dynamicTypeName, dynamicMethod->signature, error);
dynamicMethod->name = "recvmmsg0";
dynamicMethod->fnPtr = (void *) netty_epoll_native_recvmmsg0;
netty_unix_util_free_dynamic_name(&dynamicTypeName);
return dynamicMethods;
error:
free(dynamicTypeName);
netty_unix_util_free_dynamic_methods_table(dynamicMethods, fixed_method_table_size, dynamicMethodsTableSize());
return NULL;
}
// JNI Method Registration Table End
static jint netty_epoll_native_JNI_OnLoad(JNIEnv* env, const char* packagePrefix) {
int ret = JNI_ERR;
int limitsOnLoadCalled = 0;
int errorsOnLoadCalled = 0;
int filedescriptorOnLoadCalled = 0;
int socketOnLoadCalled = 0;
int bufferOnLoadCalled = 0;
int linuxsocketOnLoadCalled = 0;
char* nettyClassName = NULL;
jclass nativeDatagramPacketCls = NULL;
JNINativeMethod* dynamicMethods = NULL;
// We must register the statically referenced methods first!
if (netty_unix_util_register_natives(env,
packagePrefix,
"io/netty/channel/epoll/NativeStaticallyReferencedJniMethods",
statically_referenced_fixed_method_table,
statically_referenced_fixed_method_table_size) != 0) {
goto done;
}
// Register the methods which are not referenced by static member variables
dynamicMethods = createDynamicMethodsTable(packagePrefix);
if (dynamicMethods == NULL) {
goto done;
}
if (netty_unix_util_register_natives(env,
packagePrefix,
"io/netty/channel/epoll/Native",
dynamicMethods,
dynamicMethodsTableSize()) != 0) {
goto done;
}
// Load all c modules that we depend upon
if (netty_unix_limits_JNI_OnLoad(env, packagePrefix) == JNI_ERR) {
goto done;
}
limitsOnLoadCalled = 1;
if (netty_unix_errors_JNI_OnLoad(env, packagePrefix) == JNI_ERR) {
goto done;
}
errorsOnLoadCalled = 1;
if (netty_unix_filedescriptor_JNI_OnLoad(env, packagePrefix) == JNI_ERR) {
goto done;
}
filedescriptorOnLoadCalled = 1;
if (netty_unix_socket_JNI_OnLoad(env, packagePrefix) == JNI_ERR) {
goto done;
}
socketOnLoadCalled = 1;
if (netty_unix_buffer_JNI_OnLoad(env, packagePrefix) == JNI_ERR) {
goto done;
}
bufferOnLoadCalled = 1;
if (netty_epoll_linuxsocket_JNI_OnLoad(env, packagePrefix) == JNI_ERR) {
goto done;
}
linuxsocketOnLoadCalled = 1;
// Initialize this module
NETTY_PREPEND(packagePrefix, "io/netty/channel/epoll/NativeDatagramPacketArray$NativeDatagramPacket", nettyClassName, done);
NETTY_FIND_CLASS(env, nativeDatagramPacketCls, nettyClassName, done);
netty_unix_util_free_dynamic_name(&nettyClassName);
NETTY_GET_FIELD(env, nativeDatagramPacketCls, packetAddrFieldId, "addr", "[B", done);
NETTY_GET_FIELD(env, nativeDatagramPacketCls, packetAddrLenFieldId, "addrLen", "I", done);
NETTY_GET_FIELD(env, nativeDatagramPacketCls, packetScopeIdFieldId, "scopeId", "I", done);
NETTY_GET_FIELD(env, nativeDatagramPacketCls, packetPortFieldId, "port", "I", done);
NETTY_GET_FIELD(env, nativeDatagramPacketCls, packetMemoryAddressFieldId, "memoryAddress", "J", done);
NETTY_GET_FIELD(env, nativeDatagramPacketCls, packetCountFieldId, "count", "I", done);
ret = NETTY_JNI_VERSION;
done:
netty_unix_util_free_dynamic_methods_table(dynamicMethods, fixed_method_table_size, dynamicMethodsTableSize());
free(nettyClassName);
if (ret == JNI_ERR) {
if (limitsOnLoadCalled == 1) {
netty_unix_limits_JNI_OnUnLoad(env);
}
if (errorsOnLoadCalled == 1) {
netty_unix_errors_JNI_OnUnLoad(env);
}
if (filedescriptorOnLoadCalled == 1) {
netty_unix_filedescriptor_JNI_OnUnLoad(env);
}
if (socketOnLoadCalled == 1) {
netty_unix_socket_JNI_OnUnLoad(env);
}
if (bufferOnLoadCalled == 1) {
netty_unix_buffer_JNI_OnUnLoad(env);
}
if (linuxsocketOnLoadCalled == 1) {
netty_epoll_linuxsocket_JNI_OnUnLoad(env);
}
packetAddrFieldId = NULL;
packetAddrLenFieldId = NULL;
packetScopeIdFieldId = NULL;
packetPortFieldId = NULL;
packetMemoryAddressFieldId = NULL;
packetCountFieldId = NULL;
}
return ret;
}
static void netty_epoll_native_JNI_OnUnLoad(JNIEnv* env) {
netty_unix_limits_JNI_OnUnLoad(env);
netty_unix_errors_JNI_OnUnLoad(env);
netty_unix_filedescriptor_JNI_OnUnLoad(env);
netty_unix_socket_JNI_OnUnLoad(env);
netty_unix_buffer_JNI_OnUnLoad(env);
netty_epoll_linuxsocket_JNI_OnUnLoad(env);
packetAddrFieldId = NULL;
packetAddrLenFieldId = NULL;
packetScopeIdFieldId = NULL;
packetPortFieldId = NULL;
packetMemoryAddressFieldId = NULL;
packetCountFieldId = NULL;
}
// Invoked by the JVM when statically linked
static jint JNI_OnLoad_netty_transport_native_epoll0(JavaVM* vm, void* reserved) {
JNIEnv* env;
if ((*vm)->GetEnv(vm, (void**) &env, NETTY_JNI_VERSION) != JNI_OK) {
return JNI_ERR;
}
char* packagePrefix = NULL;
#ifndef NETTY_BUILD_STATIC
Dl_info dlinfo;
jint status = 0;
// We need to use an address of a function that is uniquely part of this library, so choose a static
// function. See https://github.com/netty/netty/issues/4840.
if (!dladdr((void*) netty_epoll_native_JNI_OnUnLoad, &dlinfo)) {
fprintf(stderr, "FATAL: transport-native-epoll JNI call to dladdr failed!\n");
return JNI_ERR;
}
packagePrefix = netty_unix_util_parse_package_prefix(dlinfo.dli_fname, "netty_transport_native_epoll", &status);
if (status == JNI_ERR) {
fprintf(stderr, "FATAL: transport-native-epoll JNI encountered unexpected dlinfo.dli_fname: %s\n", dlinfo.dli_fname);
return JNI_ERR;
}
#endif /* NETTY_BUILD_STATIC */
jint ret = netty_epoll_native_JNI_OnLoad(env, packagePrefix);
free(packagePrefix);
return ret;
}
static void JNI_OnUnload_netty_transport_native_epoll0(JavaVM* vm, void* reserved) {
JNIEnv* env;
if ((*vm)->GetEnv(vm, (void**) &env, NETTY_JNI_VERSION) != JNI_OK) {
// Something is wrong but nothing we can do about this :(
return;
}
netty_epoll_native_JNI_OnUnLoad(env);
}
// We build with -fvisibility=hidden so ensure we mark everything that needs to be visible with JNIEXPORT
// http://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 JNI_OnLoad_netty_transport_native_epoll0(vm, reserved);
}
// Invoked by the JVM when statically linked
JNIEXPORT void JNI_OnUnload_netty_transport_native_epoll(JavaVM* vm, void* reserved) {
JNI_OnUnload_netty_transport_native_epoll0(vm, reserved);
}
#ifndef NETTY_BUILD_STATIC
JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
return JNI_OnLoad_netty_transport_native_epoll0(vm, reserved);
}
JNIEXPORT void JNI_OnUnload(JavaVM* vm, void* reserved) {
JNI_OnUnload_netty_transport_native_epoll0(vm, reserved);
}
#endif /* NETTY_BUILD_STATIC */
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