446 lines
14 KiB
Java
446 lines
14 KiB
Java
/*
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* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.nio.ch;
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import java.io.FileDescriptor;
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import java.io.IOException;
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import java.net.*;
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import java.nio.channels.*;
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import java.nio.channels.spi.*;
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import java.util.*;
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import sun.net.NetHooks;
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/**
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* An implementation of ServerSocketChannels
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*/
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class ServerSocketChannelImpl
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extends ServerSocketChannel
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implements SelChImpl
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{
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// Used to make native close and configure calls
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private static NativeDispatcher nd;
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// Our file descriptor
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private final FileDescriptor fd;
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// fd value needed for dev/poll. This value will remain valid
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// even after the value in the file descriptor object has been set to -1
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private int fdVal;
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// ID of native thread currently blocked in this channel, for signalling
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private volatile long thread = 0;
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// Lock held by thread currently blocked in this channel
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private final Object lock = new Object();
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// Lock held by any thread that modifies the state fields declared below
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// DO NOT invoke a blocking I/O operation while holding this lock!
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private final Object stateLock = new Object();
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// -- The following fields are protected by stateLock
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// Channel state, increases monotonically
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private static final int ST_UNINITIALIZED = -1;
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private static final int ST_INUSE = 0;
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private static final int ST_KILLED = 1;
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private int state = ST_UNINITIALIZED;
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// Binding
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private InetSocketAddress localAddress; // null => unbound
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// set true when exclusive binding is on and SO_REUSEADDR is emulated
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private boolean isReuseAddress;
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// Our socket adaptor, if any
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ServerSocket socket;
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// -- End of fields protected by stateLock
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ServerSocketChannelImpl(SelectorProvider sp) throws IOException {
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super(sp);
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this.fd = Net.serverSocket(true);
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this.fdVal = IOUtil.fdVal(fd);
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this.state = ST_INUSE;
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}
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ServerSocketChannelImpl(SelectorProvider sp,
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FileDescriptor fd,
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boolean bound)
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throws IOException
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{
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super(sp);
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this.fd = fd;
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this.fdVal = IOUtil.fdVal(fd);
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this.state = ST_INUSE;
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if (bound)
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localAddress = Net.localAddress(fd);
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}
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public ServerSocket socket() {
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synchronized (stateLock) {
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if (socket == null)
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socket = ServerSocketAdaptor.create(this);
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return socket;
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}
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}
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@Override
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public SocketAddress getLocalAddress() throws IOException {
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synchronized (stateLock) {
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if (!isOpen())
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throw new ClosedChannelException();
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return localAddress == null ? localAddress
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: Net.getRevealedLocalAddress(
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Net.asInetSocketAddress(localAddress));
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}
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}
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@Override
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public <T> ServerSocketChannel setOption(SocketOption<T> name, T value)
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throws IOException
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{
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if (name == null)
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throw new NullPointerException();
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if (!supportedOptions().contains(name))
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throw new UnsupportedOperationException("'" + name + "' not supported");
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synchronized (stateLock) {
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if (!isOpen())
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throw new ClosedChannelException();
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if (name == StandardSocketOptions.IP_TOS) {
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ProtocolFamily family = Net.isIPv6Available() ?
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StandardProtocolFamily.INET6 : StandardProtocolFamily.INET;
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Net.setSocketOption(fd, family, name, value);
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return this;
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}
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if (name == StandardSocketOptions.SO_REUSEADDR &&
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Net.useExclusiveBind())
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{
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// SO_REUSEADDR emulated when using exclusive bind
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isReuseAddress = (Boolean)value;
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} else {
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// no options that require special handling
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Net.setSocketOption(fd, Net.UNSPEC, name, value);
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}
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return this;
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}
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}
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@Override
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@SuppressWarnings("unchecked")
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public <T> T getOption(SocketOption<T> name)
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throws IOException
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{
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if (name == null)
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throw new NullPointerException();
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if (!supportedOptions().contains(name))
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throw new UnsupportedOperationException("'" + name + "' not supported");
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synchronized (stateLock) {
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if (!isOpen())
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throw new ClosedChannelException();
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if (name == StandardSocketOptions.SO_REUSEADDR &&
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Net.useExclusiveBind())
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{
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// SO_REUSEADDR emulated when using exclusive bind
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return (T)Boolean.valueOf(isReuseAddress);
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}
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// no options that require special handling
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return (T) Net.getSocketOption(fd, Net.UNSPEC, name);
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}
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}
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private static class DefaultOptionsHolder {
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static final Set<SocketOption<?>> defaultOptions = defaultOptions();
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private static Set<SocketOption<?>> defaultOptions() {
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HashSet<SocketOption<?>> set = new HashSet<SocketOption<?>>(2);
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set.add(StandardSocketOptions.SO_RCVBUF);
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set.add(StandardSocketOptions.SO_REUSEADDR);
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set.add(StandardSocketOptions.IP_TOS);
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return Collections.unmodifiableSet(set);
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}
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}
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@Override
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public final Set<SocketOption<?>> supportedOptions() {
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return DefaultOptionsHolder.defaultOptions;
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}
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public boolean isBound() {
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synchronized (stateLock) {
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return localAddress != null;
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}
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}
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public InetSocketAddress localAddress() {
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synchronized (stateLock) {
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return localAddress;
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}
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}
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@Override
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public ServerSocketChannel bind(SocketAddress local, int backlog) throws IOException {
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synchronized (lock) {
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if (!isOpen())
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throw new ClosedChannelException();
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if (isBound())
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throw new AlreadyBoundException();
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InetSocketAddress isa = (local == null) ? new InetSocketAddress(0) :
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Net.checkAddress(local);
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SecurityManager sm = System.getSecurityManager();
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if (sm != null)
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sm.checkListen(isa.getPort());
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NetHooks.beforeTcpBind(fd, isa.getAddress(), isa.getPort());
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Net.bind(fd, isa.getAddress(), isa.getPort());
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Net.listen(fd, backlog < 1 ? 50 : backlog);
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synchronized (stateLock) {
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localAddress = Net.localAddress(fd);
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}
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}
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return this;
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}
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public SocketChannel accept() throws IOException {
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synchronized (lock) {
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if (!isOpen())
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throw new ClosedChannelException();
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if (!isBound())
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throw new NotYetBoundException();
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SocketChannel sc = null;
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int n = 0;
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FileDescriptor newfd = new FileDescriptor();
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InetSocketAddress[] isaa = new InetSocketAddress[1];
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try {
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begin();
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if (!isOpen())
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return null;
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thread = NativeThread.current();
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for (;;) {
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n = accept(this.fd, newfd, isaa);
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if ((n == IOStatus.INTERRUPTED) && isOpen())
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continue;
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break;
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}
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} finally {
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thread = 0;
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end(n > 0);
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assert IOStatus.check(n);
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}
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if (n < 1)
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return null;
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IOUtil.configureBlocking(newfd, true);
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InetSocketAddress isa = isaa[0];
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sc = new SocketChannelImpl(provider(), newfd, isa);
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SecurityManager sm = System.getSecurityManager();
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if (sm != null) {
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try {
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sm.checkAccept(isa.getAddress().getHostAddress(),
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isa.getPort());
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} catch (SecurityException x) {
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sc.close();
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throw x;
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}
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}
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return sc;
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}
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}
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protected void implConfigureBlocking(boolean block) throws IOException {
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IOUtil.configureBlocking(fd, block);
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}
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protected void implCloseSelectableChannel() throws IOException {
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synchronized (stateLock) {
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if (state != ST_KILLED)
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nd.preClose(fd);
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long th = thread;
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if (th != 0)
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NativeThread.signal(th);
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if (!isRegistered())
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kill();
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}
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}
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public void kill() throws IOException {
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synchronized (stateLock) {
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if (state == ST_KILLED)
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return;
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if (state == ST_UNINITIALIZED) {
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state = ST_KILLED;
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return;
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}
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assert !isOpen() && !isRegistered();
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nd.close(fd);
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state = ST_KILLED;
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}
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}
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/**
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* Translates native poll revent set into a ready operation set
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*/
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public boolean translateReadyOps(int ops, int initialOps,
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SelectionKeyImpl sk) {
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int intOps = sk.nioInterestOps(); // Do this just once, it synchronizes
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int oldOps = sk.nioReadyOps();
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int newOps = initialOps;
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if ((ops & Net.POLLNVAL) != 0) {
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// This should only happen if this channel is pre-closed while a
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// selection operation is in progress
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// ## Throw an error if this channel has not been pre-closed
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return false;
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}
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if ((ops & (Net.POLLERR | Net.POLLHUP)) != 0) {
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newOps = intOps;
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sk.nioReadyOps(newOps);
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return (newOps & ~oldOps) != 0;
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}
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if (((ops & Net.POLLIN) != 0) &&
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((intOps & SelectionKey.OP_ACCEPT) != 0))
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newOps |= SelectionKey.OP_ACCEPT;
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sk.nioReadyOps(newOps);
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return (newOps & ~oldOps) != 0;
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}
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public boolean translateAndUpdateReadyOps(int ops, SelectionKeyImpl sk) {
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return translateReadyOps(ops, sk.nioReadyOps(), sk);
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}
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public boolean translateAndSetReadyOps(int ops, SelectionKeyImpl sk) {
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return translateReadyOps(ops, 0, sk);
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}
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// package-private
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int poll(int events, long timeout) throws IOException {
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assert Thread.holdsLock(blockingLock()) && !isBlocking();
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synchronized (lock) {
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int n = 0;
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try {
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begin();
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synchronized (stateLock) {
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if (!isOpen())
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return 0;
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thread = NativeThread.current();
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}
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n = Net.poll(fd, events, timeout);
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} finally {
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thread = 0;
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end(n > 0);
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}
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return n;
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}
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}
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/**
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* Translates an interest operation set into a native poll event set
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*/
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public void translateAndSetInterestOps(int ops, SelectionKeyImpl sk) {
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int newOps = 0;
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// Translate ops
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if ((ops & SelectionKey.OP_ACCEPT) != 0)
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newOps |= Net.POLLIN;
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// Place ops into pollfd array
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sk.selector.putEventOps(sk, newOps);
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}
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public FileDescriptor getFD() {
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return fd;
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}
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public int getFDVal() {
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return fdVal;
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}
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public String toString() {
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StringBuffer sb = new StringBuffer();
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sb.append(this.getClass().getName());
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sb.append('[');
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if (!isOpen()) {
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sb.append("closed");
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} else {
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synchronized (stateLock) {
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InetSocketAddress addr = localAddress();
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if (addr == null) {
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sb.append("unbound");
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} else {
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sb.append(Net.getRevealedLocalAddressAsString(addr));
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}
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}
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}
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sb.append(']');
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return sb.toString();
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}
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/**
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* Accept a connection on a socket.
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*
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* @implNote Wrap native call to allow instrumentation.
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*/
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private int accept(FileDescriptor ssfd, FileDescriptor newfd,
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InetSocketAddress[] isaa)
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throws IOException
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{
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return accept0(ssfd, newfd, isaa);
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}
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// -- Native methods --
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// Accepts a new connection, setting the given file descriptor to refer to
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// the new socket and setting isaa[0] to the socket's remote address.
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// Returns 1 on success, or IOStatus.UNAVAILABLE (if non-blocking and no
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// connections are pending) or IOStatus.INTERRUPTED.
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//
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private native int accept0(FileDescriptor ssfd, FileDescriptor newfd,
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InetSocketAddress[] isaa)
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throws IOException;
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private static native void initIDs();
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static {
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// Android-removed: Code to load native libraries, doesn't make sense on Android.
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// IOUtil.load();
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initIDs();
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nd = new SocketDispatcher();
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}
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}
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