/*
* 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.ChannelException;
import io.netty.channel.DefaultFileRegion;
import io.netty.util.internal.NativeLibraryLoader;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.SystemPropertyUtil;
import java.io.IOException;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.util.Locale;
/**
* Native helper methods
*
* <strong>Internal usage only!</strong>
*/
final class Native {
private static final byte[] IPV4_MAPPED_IPV6_PREFIX = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, (byte) 0xff, (byte) 0xff };
static {
String name = SystemPropertyUtil.get("os.name").toLowerCase(Locale.UK).trim();
if (!name.startsWith("linux")) {
throw new IllegalStateException("Only supported on Linux");
}
NativeLibraryLoader.load("netty-transport-native-epoll", PlatformDependent.getClassLoader(Native.class));
}
// EventLoop operations and constants
public static final int EPOLLIN = 0x01;
public static final int EPOLLOUT = 0x02;
public static final int EPOLLACCEPT = 0x04;
public static final int EPOLLRDHUP = 0x08;
public static final int IOV_MAX = iovMax();
public static final int UIO_MAX_IOV = uioMaxIov();
public static final boolean IS_SUPPORTING_SENDMMSG = isSupportingSendmmsg();
public static native int eventFd();
public static native void eventFdWrite(int fd, long value);
public static native void eventFdRead(int fd);
public static native int epollCreate();
public static native int epollWait(int efd, long[] events, int timeout);
public static native void epollCtlAdd(int efd, final int fd, final int flags, final int id);
public static native void epollCtlMod(int efd, final int fd, final int flags, final int id);
public static native void epollCtlDel(int efd, final int fd);
// File-descriptor operations
public static native void close(int fd) throws IOException;
public static native int write(int fd, ByteBuffer buf, int pos, int limit) throws IOException;
public static native int writeAddress(int fd, long address, int pos, int limit) throws IOException;
public static native long writev(int fd, ByteBuffer[] buffers, int offset, int length) throws IOException;
public static native long writevAddresses(int fd, long memoryAddress, int length)
throws IOException;
public static native int read(int fd, ByteBuffer buf, int pos, int limit) throws IOException;
public static native int readAddress(int fd, long address, int pos, int limit) throws IOException;
public static native long sendfile(
int dest, DefaultFileRegion src, long baseOffset, long offset, long length) throws IOException;
public static int sendTo(
int fd, ByteBuffer buf, int pos, int limit, InetAddress addr, int port) throws IOException {
// just duplicate the toNativeInetAddress code here to minimize object creation as this method is expected
// to be called frequently
byte[] address;
int scopeId;
if (addr instanceof Inet6Address) {
address = addr.getAddress();
scopeId = ((Inet6Address) addr).getScopeId();
} else {
// convert to ipv4 mapped ipv6 address;
scopeId = 0;
address = ipv4MappedIpv6Address(addr.getAddress());
}
return sendTo(fd, buf, pos, limit, address, scopeId, port);
}
private static native int sendTo(
int fd, ByteBuffer buf, int pos, int limit, byte[] address, int scopeId, int port) throws IOException;
public static int sendToAddress(
int fd, long memoryAddress, int pos, int limit, InetAddress addr, int port) throws IOException {
// just duplicate the toNativeInetAddress code here to minimize object creation as this method is expected
// to be called frequently
byte[] address;
int scopeId;
if (addr instanceof Inet6Address) {
address = addr.getAddress();
scopeId = ((Inet6Address) addr).getScopeId();
} else {
// convert to ipv4 mapped ipv6 address;
scopeId = 0;
address = ipv4MappedIpv6Address(addr.getAddress());
}
return sendToAddress(fd, memoryAddress, pos, limit, address, scopeId, port);
}
private static native int sendToAddress(
int fd, long memoryAddress, int pos, int limit, byte[] address, int scopeId, int port) throws IOException;
public static int sendToAddresses(
int fd, long memoryAddress, int length, InetAddress addr, int port) throws IOException {
// just duplicate the toNativeInetAddress code here to minimize object creation as this method is expected
// to be called frequently
byte[] address;
int scopeId;
if (addr instanceof Inet6Address) {
address = addr.getAddress();
scopeId = ((Inet6Address) addr).getScopeId();
} else {
// convert to ipv4 mapped ipv6 address;
scopeId = 0;
address = ipv4MappedIpv6Address(addr.getAddress());
}
return sendToAddresses(fd, memoryAddress, length, address, scopeId, port);
}
private static native int sendToAddresses(
int fd, long memoryAddress, int length, byte[] address, int scopeId, int port) throws IOException;
public static native EpollDatagramChannel.DatagramSocketAddress recvFrom(
int fd, ByteBuffer buf, int pos, int limit) throws IOException;
public static native EpollDatagramChannel.DatagramSocketAddress recvFromAddress(
int fd, long memoryAddress, int pos, int limit) throws IOException;
public static native int sendmmsg(
int fd, NativeDatagramPacketArray.NativeDatagramPacket[] msgs, int offset, int len) throws IOException;
private static native boolean isSupportingSendmmsg();
// socket operations
public static int socketStreamFd() {
try {
return socketStream();
} catch (IOException e) {
throw new ChannelException(e);
}
}
public static int socketDgramFd() {
try {
return socketDgram();
} catch (IOException e) {
throw new ChannelException(e);
}
}
private static native int socketStream() throws IOException;
private static native int socketDgram() throws IOException;
public static void bind(int fd, InetAddress addr, int port) throws IOException {
NativeInetAddress address = toNativeInetAddress(addr);
bind(fd, address.address, address.scopeId, port);
}
static byte[] ipv4MappedIpv6Address(byte[] ipv4) {
byte[] address = new byte[16];
System.arraycopy(IPV4_MAPPED_IPV6_PREFIX, 0, address, 0, IPV4_MAPPED_IPV6_PREFIX.length);
System.arraycopy(ipv4, 0, address, 12, ipv4.length);
return address;
}
public static native void bind(int fd, byte[] address, int scopeId, int port) throws IOException;
public static native void listen(int fd, int backlog) throws IOException;
public static boolean connect(int fd, InetAddress addr, int port) throws IOException {
NativeInetAddress address = toNativeInetAddress(addr);
return connect(fd, address.address, address.scopeId, port);
}
public static native boolean connect(int fd, byte[] address, int scopeId, int port) throws IOException;
public static native boolean finishConnect(int fd) throws IOException;
public static native InetSocketAddress remoteAddress(int fd);
public static native InetSocketAddress localAddress(int fd);
public static native int accept(int fd) throws IOException;
public static native void shutdown(int fd, boolean read, boolean write) throws IOException;
// Socket option operations
public static native int getReceiveBufferSize(int fd);
public static native int getSendBufferSize(int fd);
public static native int isKeepAlive(int fd);
public static native int isReuseAddress(int fd);
public static native int isReusePort(int fd);
public static native int isTcpNoDelay(int fd);
public static native int isTcpCork(int fd);
public static native int getSoLinger(int fd);
public static native int getTrafficClass(int fd);
public static native int isBroadcast(int fd);
public static native int getTcpKeepIdle(int fd);
public static native int getTcpKeepIntvl(int fd);
public static native int getTcpKeepCnt(int fd);
public static native void setKeepAlive(int fd, int keepAlive);
public static native void setReceiveBufferSize(int fd, int receiveBufferSize);
public static native void setReuseAddress(int fd, int reuseAddress);
public static native void setReusePort(int fd, int reuseAddress);
public static native void setSendBufferSize(int fd, int sendBufferSize);
public static native void setTcpNoDelay(int fd, int tcpNoDelay);
public static native void setTcpCork(int fd, int tcpCork);
public static native void setSoLinger(int fd, int soLinger);
public static native void setTrafficClass(int fd, int tcpNoDelay);
public static native void setBroadcast(int fd, int broadcast);
public static native void setTcpKeepIdle(int fd, int seconds);
public static native void setTcpKeepIntvl(int fd, int seconds);
public static native void setTcpKeepCnt(int fd, int probes);
private static NativeInetAddress toNativeInetAddress(InetAddress addr) {
byte[] bytes = addr.getAddress();
if (addr instanceof Inet6Address) {
return new NativeInetAddress(bytes, ((Inet6Address) addr).getScopeId());
} else {
// convert to ipv4 mapped ipv6 address;
return new NativeInetAddress(ipv4MappedIpv6Address(bytes));
}
}
private static class NativeInetAddress {
final byte[] address;
final int scopeId;
NativeInetAddress(byte[] address, int scopeId) {
this.address = address;
this.scopeId = scopeId;
}
NativeInetAddress(byte[] address) {
this(address, 0);
}
}
public static native String kernelVersion();
private static native int iovMax();
private static native int uioMaxIov();
private Native() {
// utility
}
}