/*
* 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 io.netty.channel.epoll;
import io.netty.channel.DefaultFileRegion;
import io.netty.channel.unix.Errors.NativeIoException;
import io.netty.util.internal.NativeLibraryLoader;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.SystemPropertyUtil;
import io.netty.channel.unix.FileDescriptor;
import io.netty.channel.unix.NativeInetAddress;
import io.netty.util.internal.ThrowableUtil;
import java.io.IOException;
import java.net.InetAddress;
import java.nio.channels.ClosedChannelException;
import java.util.Locale;
import static io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.epollerr;
import static io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.epollet;
import static io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.epollin;
import static io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.epollout;
import static io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.epollrdhup;
import static io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.isSupportingSendmmsg;
import static io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.isSupportingTcpFastopen;
import static io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.kernelVersion;
import static io.netty.channel.epoll.NativeStaticallyReferencedJniMethods.tcpMd5SigMaxKeyLen;
import static io.netty.channel.unix.Errors.ERRNO_EAGAIN_NEGATIVE;
import static io.netty.channel.unix.Errors.ERRNO_EPIPE_NEGATIVE;
import static io.netty.channel.unix.Errors.ERRNO_EWOULDBLOCK_NEGATIVE;
import static io.netty.channel.unix.Errors.ioResult;
import static io.netty.channel.unix.Errors.newConnectionResetException;
import static io.netty.channel.unix.Errors.newIOException;
/**
* Native helper methods
* <p><strong>Internal usage only!</strong>
* <p>Static members which call JNI methods must be defined in {@link NativeStaticallyReferencedJniMethods}.
*/
public final class Native {
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();
}
}
// 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 SENDFILE_CONNECTION_RESET_EXCEPTION;
private static final NativeIoException SENDMMSG_CONNECTION_RESET_EXCEPTION;
private static final NativeIoException SPLICE_CONNECTION_RESET_EXCEPTION;
private static final ClosedChannelException SENDFILE_CLOSED_CHANNEL_EXCEPTION = ThrowableUtil.unknownStackTrace(
new ClosedChannelException(), Native.class, "sendfile(...)");
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 {
SENDFILE_CONNECTION_RESET_EXCEPTION = newConnectionResetException("syscall:sendfile(...)",
ERRNO_EPIPE_NEGATIVE);
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());
}
private static native int eventFd();
public static native void eventFdWrite(int fd, long value);
public static native void eventFdRead(int fd);
public static FileDescriptor newEpollCreate() {
return new FileDescriptor(epollCreate());
}
private static native int epollCreate();
public static int epollWait(int efd, EpollEventArray events, int timeout) throws IOException {
int ready = epollWait0(efd, events.memoryAddress(), events.length(), timeout);
if (ready < 0) {
throw newIOException("epoll_wait", ready);
}
return ready;
}
private static native int epollWait0(int efd, long address, int len, int timeout);
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 long sendfile(
int dest, DefaultFileRegion src, long baseOffset, long offset, long length) throws IOException {
// Open the file-region as it may be created via the lazy constructor. This is needed as we directly access
// the FileChannel field directly via JNI
src.open();
long res = sendfile0(dest, src, baseOffset, offset, length);
if (res >= 0) {
return res;
}
return ioResult("sendfile", (int) res, SENDFILE_CONNECTION_RESET_EXCEPTION, SENDFILE_CLOSED_CHANNEL_EXCEPTION);
}
private static native long sendfile0(
int dest, DefaultFileRegion src, long baseOffset, long offset, long length) throws IOException;
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");
}
NativeLibraryLoader.load(SystemPropertyUtil.get("io.netty.packagePrefix", "").replace('.', '-') +
"netty-transport-native-epoll", PlatformDependent.getClassLoader(Native.class));
}
private Native() {
// utility
}
}