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The official Couchbase JVM Core IO Library
/*
* 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.
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "netty_kqueue_bsdsocket.h"
#include "netty_kqueue_eventarray.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/kqueue/KQueueStaticallyReferencedJniMethods"
#define NATIVE_CLASSNAME "io/netty/channel/kqueue/Native"
// Currently only macOS supports EVFILT_SOCK, and it is currently only available in internal APIs.
// To make compiling easier we redefine the values here if they are not present.
#ifdef __APPLE__
#ifndef EVFILT_SOCK
#define EVFILT_SOCK -13
#endif /* EVFILT_SOCK */
#ifndef NOTE_CONNRESET
#define NOTE_CONNRESET 0x00000001
#endif /* NOTE_CONNRESET */
#ifndef NOTE_READCLOSED
#define NOTE_READCLOSED 0x00000002
#endif /* NOTE_READCLOSED */
#ifndef NOTE_DISCONNECTED
#define NOTE_DISCONNECTED 0x00001000
#endif /* NOTE_DISCONNECTED */
#ifndef CONNECT_RESUME_ON_READ_WRITE
#define CONNECT_RESUME_ON_READ_WRITE 0x1
#endif /* CONNECT_RESUME_ON_READ_WRITE */
#ifndef CONNECT_DATA_IDEMPOTENT
#define CONNECT_DATA_IDEMPOTENT 0x2
#endif /* CONNECT_DATA_IDEMPOTENT */
#else
#ifndef EVFILT_SOCK
#define EVFILT_SOCK 0 // Disabled
#endif /* EVFILT_SOCK */
#ifndef NOTE_CONNRESET
#define NOTE_CONNRESET 0
#endif /* NOTE_CONNRESET */
#ifndef NOTE_READCLOSED
#define NOTE_READCLOSED 0
#endif /* NOTE_READCLOSED */
#ifndef NOTE_DISCONNECTED
#define NOTE_DISCONNECTED 0
#endif /* NOTE_DISCONNECTED */
#ifndef CONNECT_RESUME_ON_READ_WRITE
#define CONNECT_RESUME_ON_READ_WRITE 0
#endif /* CONNECT_RESUME_ON_READ_WRITE */
#ifndef CONNECT_DATA_IDEMPOTENT
#define CONNECT_DATA_IDEMPOTENT 0
#endif /* CONNECT_DATA_IDEMPOTENT */
#endif /* __APPLE__ */
static clockid_t waitClockId = 0; // initialized by netty_unix_util_initialize_wait_clock
static const char* staticPackagePrefix = NULL;
static int register_unix_called = 0;
static jint netty_kqueue_native_kqueueCreate(JNIEnv* env, jclass clazz) {
jint kq = kqueue();
if (kq < 0) {
netty_unix_errors_throwChannelExceptionErrorNo(env, "kqueue() failed: ", errno);
}
return kq;
}
static jint netty_kqueue_native_keventChangeSingleUserEvent(jint kqueueFd, struct kevent* userEvent) {
int result, err;
result = kevent(kqueueFd, userEvent, 1, NULL, 0, NULL);
if (result < 0) {
// https://www.freebsd.org/cgi/man.cgi?query=kqueue&sektion=2
// When kevent() call fails with EINTR error, all changes in the changelist have been applied.
return (err = errno) == EINTR ? 0 : -err;
}
return result;
}
static jint netty_kqueue_native_keventTriggerUserEvent(JNIEnv* env, jclass clazz, jint kqueueFd, jint ident) {
struct kevent userEvent;
EV_SET(&userEvent, ident, EVFILT_USER, 0, NOTE_TRIGGER | NOTE_FFNOP, 0, NULL);
return netty_kqueue_native_keventChangeSingleUserEvent(kqueueFd, &userEvent);
}
static jint netty_kqueue_native_keventAddUserEvent(JNIEnv* env, jclass clazz, jint kqueueFd, jint ident) {
struct kevent userEvent;
EV_SET(&userEvent, ident, EVFILT_USER, EV_ADD | EV_ENABLE | EV_CLEAR, NOTE_FFNOP, 0, NULL);
return netty_kqueue_native_keventChangeSingleUserEvent(kqueueFd, &userEvent);
}
static jint netty_kqueue_native_keventWait(JNIEnv* env, jclass clazz, jint kqueueFd, jlong changeListAddress, jint changeListLength,
jlong eventListAddress, jint eventListLength, jint tvSec, jint tvNsec) {
struct kevent* changeList = (struct kevent*) changeListAddress;
struct kevent* eventList = (struct kevent*) eventListAddress;
struct timespec beforeTs, nowTs, timeoutTs;
int result, err;
timeoutTs.tv_sec = tvSec;
timeoutTs.tv_nsec = tvNsec;
if (tvSec == 0 && tvNsec == 0) {
// Zeros = poll (aka return immediately).
for (;;) {
result = kevent(kqueueFd, changeList, changeListLength, eventList, eventListLength, &timeoutTs);
if (result >= 0) {
return result;
}
if ((err = errno) != EINTR) {
return -err;
}
// https://www.freebsd.org/cgi/man.cgi?query=kqueue&sektion=2
// When kevent() call fails with EINTR error, all changes in the changelist have been applied.
changeListLength = 0;
}
}
// Wait with a timeout value.
netty_unix_util_clock_gettime(waitClockId, &beforeTs);
for (;;) {
result = kevent(kqueueFd, changeList, changeListLength, eventList, eventListLength, &timeoutTs);
if (result >= 0) {
return result;
}
if ((err = errno) != EINTR) {
return -err;
}
netty_unix_util_clock_gettime(waitClockId, &nowTs);
if (netty_unix_util_timespec_subtract_ns(&timeoutTs,
netty_unix_util_timespec_elapsed_ns(&beforeTs, &nowTs))) {
return 0;
}
beforeTs = nowTs;
// https://www.freebsd.org/cgi/man.cgi?query=kqueue&sektion=2
// When kevent() call fails with EINTR error, all changes in the changelist have been applied.
changeListLength = 0;
}
}
static jint netty_kqueue_native_registerUnix(JNIEnv* env, jclass clazz) {
register_unix_called = 1;
return netty_unix_register(env, staticPackagePrefix);
}
static jint netty_kqueue_native_sizeofKEvent(JNIEnv* env, jclass clazz) {
return sizeof(struct kevent);
}
static jint netty_kqueue_native_offsetofKEventIdent(JNIEnv* env, jclass clazz) {
return offsetof(struct kevent, ident);
}
static jint netty_kqueue_native_offsetofKEventFlags(JNIEnv* env, jclass clazz) {
return offsetof(struct kevent, flags);
}
static jint netty_kqueue_native_offsetofKEventFilter(JNIEnv* env, jclass clazz) {
return offsetof(struct kevent, filter);
}
static jint netty_kqueue_native_offsetofKEventFFlags(JNIEnv* env, jclass clazz) {
return offsetof(struct kevent, fflags);
}
static jint netty_kqueue_native_offsetofKeventData(JNIEnv* env, jclass clazz) {
return offsetof(struct kevent, data);
}
static jshort netty_kqueue_native_evfiltRead(JNIEnv* env, jclass clazz) {
return EVFILT_READ;
}
static jshort netty_kqueue_native_evfiltWrite(JNIEnv* env, jclass clazz) {
return EVFILT_WRITE;
}
static jshort netty_kqueue_native_evfiltUser(JNIEnv* env, jclass clazz) {
return EVFILT_USER;
}
static jshort netty_kqueue_native_evfiltSock(JNIEnv* env, jclass clazz) {
return EVFILT_SOCK;
}
static jshort netty_kqueue_native_evAdd(JNIEnv* env, jclass clazz) {
return EV_ADD;
}
static jshort netty_kqueue_native_evEnable(JNIEnv* env, jclass clazz) {
return EV_ENABLE;
}
static jshort netty_kqueue_native_evDisable(JNIEnv* env, jclass clazz) {
return EV_DISABLE;
}
static jshort netty_kqueue_native_evDelete(JNIEnv* env, jclass clazz) {
return EV_DELETE;
}
static jshort netty_kqueue_native_evClear(JNIEnv* env, jclass clazz) {
return EV_CLEAR;
}
static jshort netty_kqueue_native_evEOF(JNIEnv* env, jclass clazz) {
return EV_EOF;
}
static jshort netty_kqueue_native_evError(JNIEnv* env, jclass clazz) {
return EV_ERROR;
}
static jshort netty_kqueue_native_noteConnReset(JNIEnv* env, jclass clazz) {
return NOTE_CONNRESET;
}
static jshort netty_kqueue_native_noteReadClosed(JNIEnv* env, jclass clazz) {
return NOTE_READCLOSED;
}
static jshort netty_kqueue_native_noteDisconnected(JNIEnv* env, jclass clazz) {
return NOTE_DISCONNECTED;
}
static jint netty_kqueue_bsdsocket_connectResumeOnReadWrite(JNIEnv *env) {
return CONNECT_RESUME_ON_READ_WRITE;
}
static jint netty_kqueue_bsdsocket_connectDataIdempotent(JNIEnv *env) {
return CONNECT_DATA_IDEMPOTENT;
}
// JNI Method Registration Table Begin
static const JNINativeMethod statically_referenced_fixed_method_table[] = {
{ "evfiltRead", "()S", (void *) netty_kqueue_native_evfiltRead },
{ "evfiltWrite", "()S", (void *) netty_kqueue_native_evfiltWrite },
{ "evfiltUser", "()S", (void *) netty_kqueue_native_evfiltUser },
{ "evfiltSock", "()S", (void *) netty_kqueue_native_evfiltSock },
{ "evAdd", "()S", (void *) netty_kqueue_native_evAdd },
{ "evEnable", "()S", (void *) netty_kqueue_native_evEnable },
{ "evDisable", "()S", (void *) netty_kqueue_native_evDisable },
{ "evDelete", "()S", (void *) netty_kqueue_native_evDelete },
{ "evClear", "()S", (void *) netty_kqueue_native_evClear },
{ "evEOF", "()S", (void *) netty_kqueue_native_evEOF },
{ "evError", "()S", (void *) netty_kqueue_native_evError },
{ "noteReadClosed", "()S", (void *) netty_kqueue_native_noteReadClosed },
{ "noteConnReset", "()S", (void *) netty_kqueue_native_noteConnReset },
{ "noteDisconnected", "()S", (void *) netty_kqueue_native_noteDisconnected },
{ "connectResumeOnReadWrite", "()I", (void *) netty_kqueue_bsdsocket_connectResumeOnReadWrite },
{ "connectDataIdempotent", "()I", (void *) netty_kqueue_bsdsocket_connectDataIdempotent }
};
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[] = {
{ "kqueueCreate", "()I", (void *) netty_kqueue_native_kqueueCreate },
{ "keventTriggerUserEvent", "(II)I", (void *) netty_kqueue_native_keventTriggerUserEvent },
{ "keventAddUserEvent", "(II)I", (void *) netty_kqueue_native_keventAddUserEvent },
{ "keventWait", "(IJIJIII)I", (void *) netty_kqueue_native_keventWait },
{ "sizeofKEvent", "()I", (void *) netty_kqueue_native_sizeofKEvent },
{ "offsetofKEventIdent", "()I", (void *) netty_kqueue_native_offsetofKEventIdent },
{ "offsetofKEventFlags", "()I", (void *) netty_kqueue_native_offsetofKEventFlags },
{ "offsetofKEventFFlags", "()I", (void *) netty_kqueue_native_offsetofKEventFFlags },
{ "offsetofKEventFilter", "()I", (void *) netty_kqueue_native_offsetofKEventFilter },
{ "offsetofKeventData", "()I", (void *) netty_kqueue_native_offsetofKeventData },
{ "registerUnix", "()I", (void *) netty_kqueue_native_registerUnix }
};
static const jint fixed_method_table_size = sizeof(fixed_method_table) / sizeof(fixed_method_table[0]);
// 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_kqueue_native_JNI_OnLoad(JNIEnv* env, const char* packagePrefix) {
int staticallyRegistered = 0;
int nativeRegistered = 0;
int bsdsocketOnLoadCalled = 0;
int eventarrayOnLoadCalled = 0;
// 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 error;
}
staticallyRegistered = 1;
// Register the methods which are not referenced by static member variables
if (netty_jni_util_register_natives(env, packagePrefix, NATIVE_CLASSNAME, fixed_method_table, fixed_method_table_size) != 0) {
goto error;
}
nativeRegistered = 1;
if (netty_kqueue_bsdsocket_JNI_OnLoad(env, packagePrefix) == JNI_ERR) {
goto error;
}
bsdsocketOnLoadCalled = 1;
if (netty_kqueue_eventarray_JNI_OnLoad(env, packagePrefix) == JNI_ERR) {
goto error;
}
eventarrayOnLoadCalled = 1;
// Initialize this module
if (!netty_unix_util_initialize_wait_clock(&waitClockId)) {
fprintf(stderr, "FATAL: could not find a clock for clock_gettime!\n");
fflush(stderr);
goto error;
}
if (packagePrefix != NULL) {
staticPackagePrefix = strdup(packagePrefix);
}
return NETTY_JNI_UTIL_JNI_VERSION;
error:
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 (bsdsocketOnLoadCalled == 1) {
netty_kqueue_bsdsocket_JNI_OnUnLoad(env, packagePrefix);
}
if (eventarrayOnLoadCalled == 1) {
netty_kqueue_eventarray_JNI_OnUnLoad(env, packagePrefix);
}
return JNI_ERR;
}
static void netty_kqueue_native_JNI_OnUnload(JNIEnv* env) {
netty_kqueue_bsdsocket_JNI_OnUnLoad(env, staticPackagePrefix);
netty_kqueue_eventarray_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;
}
}
// 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_kqueue(JavaVM* vm, void* reserved) {
return netty_jni_util_JNI_OnLoad(vm, reserved, "netty_transport_native_kqueue", netty_kqueue_native_JNI_OnLoad);
}
// Invoked by the JVM when statically linked
JNIEXPORT void JNI_OnUnload_netty_transport_native_kqueue(JavaVM* vm, void* reserved) {
netty_jni_util_JNI_OnUnload(vm, reserved, netty_kqueue_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_kqueue", netty_kqueue_native_JNI_OnLoad);
}
JNIEXPORT void JNI_OnUnload(JavaVM* vm, void* reserved) {
netty_jni_util_JNI_OnUnload(vm, reserved, netty_kqueue_native_JNI_OnUnload);
}
#endif /* NETTY_BUILD_STATIC */