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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.
*/
package ch.cern.hbase.thirdparty.io.netty.channel.epoll;
import ch.cern.hbase.thirdparty.io.netty.channel.unix.Errors.NativeIoException;
import ch.cern.hbase.thirdparty.io.netty.channel.unix.FileDescriptor;
import ch.cern.hbase.thirdparty.io.netty.channel.unix.Socket;
import ch.cern.hbase.thirdparty.io.netty.util.internal.NativeLibraryLoader;
import ch.cern.hbase.thirdparty.io.netty.util.internal.PlatformDependent;
import ch.cern.hbase.thirdparty.io.netty.util.internal.SystemPropertyUtil;
import ch.cern.hbase.thirdparty.io.netty.util.internal.ThrowableUtil;
import ch.cern.hbase.thirdparty.io.netty.util.internal.logging.InternalLogger;
import ch.cern.hbase.thirdparty.io.netty.util.internal.logging.InternalLoggerFactory;
import java.io.IOException;
import java.nio.channels.ClosedChannelException;
import java.util.Locale;
import static ch.cern.hbase.thirdparty.io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.epollerr;
import static ch.cern.hbase.thirdparty.io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.epollet;
import static ch.cern.hbase.thirdparty.io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.epollin;
import static ch.cern.hbase.thirdparty.io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.epollout;
import static ch.cern.hbase.thirdparty.io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.epollrdhup;
import static ch.cern.hbase.thirdparty.io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.isSupportingSendmmsg;
import static ch.cern.hbase.thirdparty.io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.isSupportingTcpFastopen;
import static ch.cern.hbase.thirdparty.io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.kernelVersion;
import static ch.cern.hbase.thirdparty.io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.tcpMd5SigMaxKeyLen;
import static ch.cern.hbase.thirdparty.io.netty.channel.unix.Errors.ERRNO_EPIPE_NEGATIVE;
import static ch.cern.hbase.thirdparty.io.netty.channel.unix.Errors.ioResult;
import static ch.cern.hbase.thirdparty.io.netty.channel.unix.Errors.newConnectionResetException;
import static ch.cern.hbase.thirdparty.io.netty.channel.unix.Errors.newIOException;
/**
* Native helper methods
* Internal usage only!
*
Static members which call JNI methods must be defined in {@link NativeStaticallyReferencedJniMethods}.
*/
public final class Native {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(Native.class);
static {
try {
// First, try calling a side-effect free JNI method to see if the library was already
// loaded by the application.
offsetofEpollData();
} catch (UnsatisfiedLinkError ignore) {
// The library was not previously loaded, load it now.
loadNativeLibrary();
}
Socket.initialize();
}
// EventLoop operations and constants
public static final int EPOLLIN = epollin();
public static final int EPOLLOUT = epollout();
public static final int EPOLLRDHUP = epollrdhup();
public static final int EPOLLET = epollet();
public static final int EPOLLERR = epollerr();
public static final boolean IS_SUPPORTING_SENDMMSG = isSupportingSendmmsg();
public static final boolean IS_SUPPORTING_TCP_FASTOPEN = isSupportingTcpFastopen();
public static final int TCP_MD5SIG_MAXKEYLEN = tcpMd5SigMaxKeyLen();
public static final String KERNEL_VERSION = kernelVersion();
private static final NativeIoException SENDMMSG_CONNECTION_RESET_EXCEPTION;
private static final NativeIoException SPLICE_CONNECTION_RESET_EXCEPTION;
private static final ClosedChannelException SENDMMSG_CLOSED_CHANNEL_EXCEPTION = ThrowableUtil.unknownStackTrace(
new ClosedChannelException(), Native.class, "sendmmsg(...)");
private static final ClosedChannelException SPLICE_CLOSED_CHANNEL_EXCEPTION = ThrowableUtil.unknownStackTrace(
new ClosedChannelException(), Native.class, "splice(...)");
static {
SENDMMSG_CONNECTION_RESET_EXCEPTION = newConnectionResetException("syscall:sendmmsg(...)",
ERRNO_EPIPE_NEGATIVE);
SPLICE_CONNECTION_RESET_EXCEPTION = newConnectionResetException("syscall:splice(...)",
ERRNO_EPIPE_NEGATIVE);
}
public static FileDescriptor newEventFd() {
return new FileDescriptor(eventFd());
}
public static FileDescriptor newTimerFd() {
return new FileDescriptor(timerFd());
}
private static native int eventFd();
private static native int timerFd();
public static native void eventFdWrite(int fd, long value);
public static native void eventFdRead(int fd);
static native void timerFdRead(int fd);
public static FileDescriptor newEpollCreate() {
return new FileDescriptor(epollCreate());
}
private static native int epollCreate();
public static int epollWait(FileDescriptor epollFd, EpollEventArray events, FileDescriptor timerFd,
int timeoutSec, int timeoutNs) throws IOException {
int ready = epollWait0(epollFd.intValue(), events.memoryAddress(), events.length(), timerFd.intValue(),
timeoutSec, timeoutNs);
if (ready < 0) {
throw newIOException("epoll_wait", ready);
}
return ready;
}
private static native int epollWait0(int efd, long address, int len, int timerFd, int timeoutSec, int timeoutNs);
/**
* Non-blocking variant of
* {@link #epollWait(FileDescriptor, EpollEventArray, FileDescriptor, int, int)}
* that will also hint to processor we are in a busy-wait loop.
*/
public static int epollBusyWait(FileDescriptor epollFd, EpollEventArray events) throws IOException {
int ready = epollBusyWait0(epollFd.intValue(), events.memoryAddress(), events.length());
if (ready < 0) {
throw newIOException("epoll_wait", ready);
}
return ready;
}
private static native int epollBusyWait0(int efd, long address, int len);
public static void epollCtlAdd(int efd, final int fd, final int flags) throws IOException {
int res = epollCtlAdd0(efd, fd, flags);
if (res < 0) {
throw newIOException("epoll_ctl", res);
}
}
private static native int epollCtlAdd0(int efd, final int fd, final int flags);
public static void epollCtlMod(int efd, final int fd, final int flags) throws IOException {
int res = epollCtlMod0(efd, fd, flags);
if (res < 0) {
throw newIOException("epoll_ctl", res);
}
}
private static native int epollCtlMod0(int efd, final int fd, final int flags);
public static void epollCtlDel(int efd, final int fd) throws IOException {
int res = epollCtlDel0(efd, fd);
if (res < 0) {
throw newIOException("epoll_ctl", res);
}
}
private static native int epollCtlDel0(int efd, final int fd);
// File-descriptor operations
public static int splice(int fd, long offIn, int fdOut, long offOut, long len) throws IOException {
int res = splice0(fd, offIn, fdOut, offOut, len);
if (res >= 0) {
return res;
}
return ioResult("splice", res, SPLICE_CONNECTION_RESET_EXCEPTION, SPLICE_CLOSED_CHANNEL_EXCEPTION);
}
private static native int splice0(int fd, long offIn, int fdOut, long offOut, long len);
public static int sendmmsg(
int fd, NativeDatagramPacketArray.NativeDatagramPacket[] msgs, int offset, int len) throws IOException {
int res = sendmmsg0(fd, msgs, offset, len);
if (res >= 0) {
return res;
}
return ioResult("sendmmsg", res, SENDMMSG_CONNECTION_RESET_EXCEPTION, SENDMMSG_CLOSED_CHANNEL_EXCEPTION);
}
private static native int sendmmsg0(
int fd, NativeDatagramPacketArray.NativeDatagramPacket[] msgs, int offset, int len);
// epoll_event related
public static native int sizeofEpollEvent();
public static native int offsetofEpollData();
private static void loadNativeLibrary() {
String name = SystemPropertyUtil.get("os.name").toLowerCase(Locale.UK).trim();
if (!name.startsWith("linux")) {
throw new IllegalStateException("Only supported on Linux");
}
String staticLibName = "netty_transport_native_epoll";
String sharedLibName = staticLibName + '_' + PlatformDependent.normalizedArch();
ClassLoader cl = PlatformDependent.getClassLoader(Native.class);
try {
NativeLibraryLoader.load(sharedLibName, cl);
} catch (UnsatisfiedLinkError e1) {
try {
NativeLibraryLoader.load(staticLibName, cl);
logger.debug("Failed to load {}", sharedLibName, e1);
} catch (UnsatisfiedLinkError e2) {
ThrowableUtil.addSuppressed(e1, e2);
throw e1;
}
}
}
private Native() {
// utility
}
}