/*
* Copyright (c) 2000, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package sun.nio.ch;
import java.io.FileDescriptor;
import java.io.IOException;
import java.lang.reflect.*;
import java.net.*;
import java.nio.channels.*;
import java.nio.channels.spi.*;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.HashSet;
import java.util.Iterator;
/**
* An implementation of ServerSocketChannels
*/
class ServerSocketChannelImpl
extends ServerSocketChannel
implements SelChImpl
{
// Used to make native close and configure calls
private static NativeDispatcher nd;
// Our file descriptor
private final FileDescriptor fd;
// fd value needed for dev/poll. This value will remain valid
// even after the value in the file descriptor object has been set to -1
private int fdVal;
// ID of native thread currently blocked in this channel, for signalling
private volatile long thread = 0;
// Lock held by thread currently blocked in this channel
private final Object lock = new Object();
// Lock held by any thread that modifies the state fields declared below
// DO NOT invoke a blocking I/O operation while holding this lock!
private final Object stateLock = new Object();
// -- The following fields are protected by stateLock
// Channel state, increases monotonically
private static final int ST_UNINITIALIZED = -1;
private static final int ST_INUSE = 0;
private static final int ST_KILLED = 1;
private int state = ST_UNINITIALIZED;
// Binding
private SocketAddress localAddress = null; // null => unbound
// Options, created on demand
private SocketOpts.IP.TCP options = null;
// Our socket adaptor, if any
ServerSocket socket;
// -- End of fields protected by stateLock
public ServerSocketChannelImpl(SelectorProvider sp) throws IOException {
super(sp);
this.fd = Net.serverSocket(true);
this.fdVal = IOUtil.fdVal(fd);
this.state = ST_INUSE;
}
public ServerSocketChannelImpl(SelectorProvider sp, FileDescriptor fd)
throws IOException
{
super(sp);
this.fd = fd;
this.fdVal = IOUtil.fdVal(fd);
this.state = ST_INUSE;
localAddress = Net.localAddress(fd);
}
public ServerSocket socket() {
synchronized (stateLock) {
if (socket == null)
socket = ServerSocketAdaptor.create(this);
return socket;
}
}
public boolean isBound() {
synchronized (stateLock) {
return localAddress != null;
}
}
public SocketAddress localAddress() {
synchronized (stateLock) {
return localAddress;
}
}
public void bind(SocketAddress local, int backlog) throws IOException {
synchronized (lock) {
if (!isOpen())
throw new ClosedChannelException();
if (isBound())
throw new AlreadyBoundException();
InetSocketAddress isa = Net.checkAddress(local);
SecurityManager sm = System.getSecurityManager();
if (sm != null)
sm.checkListen(isa.getPort());
Net.bind(fd, isa.getAddress(), isa.getPort());
listen(fd, backlog < 1 ? 50 : backlog);
synchronized (stateLock) {
localAddress = Net.localAddress(fd);
}
}
}
public SocketChannel accept() throws IOException {
synchronized (lock) {
if (!isOpen())
throw new ClosedChannelException();
if (!isBound())
throw new NotYetBoundException();
SocketChannel sc = null;
int n = 0;
FileDescriptor newfd = new FileDescriptor();
InetSocketAddress[] isaa = new InetSocketAddress[1];
try {
begin();
if (!isOpen())
return null;
thread = NativeThread.current();
for (;;) {
n = accept0(this.fd, newfd, isaa);
if ((n == IOStatus.INTERRUPTED) && isOpen())
continue;
break;
}
} finally {
thread = 0;
end(n > 0);
assert IOStatus.check(n);
}
if (n < 1)
return null;
IOUtil.configureBlocking(newfd, true);
InetSocketAddress isa = isaa[0];
sc = new SocketChannelImpl(provider(), newfd, isa);
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
try {
sm.checkAccept(isa.getAddress().getHostAddress(),
isa.getPort());
} catch (SecurityException x) {
sc.close();
throw x;
}
}
return sc;
}
}
protected void implConfigureBlocking(boolean block) throws IOException {
IOUtil.configureBlocking(fd, block);
}
public SocketOpts options() {
synchronized (stateLock) {
if (options == null) {
SocketOptsImpl.Dispatcher d
= new SocketOptsImpl.Dispatcher() {
int getInt(int opt) throws IOException {
return Net.getIntOption(fd, opt);
}
void setInt(int opt, int arg) throws IOException {
Net.setIntOption(fd, opt, arg);
}
};
options = new SocketOptsImpl.IP.TCP(d);
}
return options;
}
}
protected void implCloseSelectableChannel() throws IOException {
synchronized (stateLock) {
nd.preClose(fd);
long th = thread;
if (th != 0)
NativeThread.signal(th);
if (!isRegistered())
kill();
}
}
public void kill() throws IOException {
synchronized (stateLock) {
if (state == ST_KILLED)
return;
if (state == ST_UNINITIALIZED) {
state = ST_KILLED;
return;
}
assert !isOpen() && !isRegistered();
nd.close(fd);
state = ST_KILLED;
}
}
/**
* Translates native poll revent set into a ready operation set
*/
public boolean translateReadyOps(int ops, int initialOps,
SelectionKeyImpl sk) {
int intOps = sk.nioInterestOps(); // Do this just once, it synchronizes
int oldOps = sk.nioReadyOps();
int newOps = initialOps;
if ((ops & PollArrayWrapper.POLLNVAL) != 0) {
// This should only happen if this channel is pre-closed while a
// selection operation is in progress
// ## Throw an error if this channel has not been pre-closed
return false;
}
if ((ops & (PollArrayWrapper.POLLERR
| PollArrayWrapper.POLLHUP)) != 0) {
newOps = intOps;
sk.nioReadyOps(newOps);
return (newOps & ~oldOps) != 0;
}
if (((ops & PollArrayWrapper.POLLIN) != 0) &&
((intOps & SelectionKey.OP_ACCEPT) != 0))
newOps |= SelectionKey.OP_ACCEPT;
sk.nioReadyOps(newOps);
return (newOps & ~oldOps) != 0;
}
public boolean translateAndUpdateReadyOps(int ops, SelectionKeyImpl sk) {
return translateReadyOps(ops, sk.nioReadyOps(), sk);
}
public boolean translateAndSetReadyOps(int ops, SelectionKeyImpl sk) {
return translateReadyOps(ops, 0, sk);
}
/**
* Translates an interest operation set into a native poll event set
*/
public void translateAndSetInterestOps(int ops, SelectionKeyImpl sk) {
int newOps = 0;
// Translate ops
if ((ops & SelectionKey.OP_ACCEPT) != 0)
newOps |= PollArrayWrapper.POLLIN;
// Place ops into pollfd array
sk.selector.putEventOps(sk, newOps);
}
public FileDescriptor getFD() {
return fd;
}
public int getFDVal() {
return fdVal;
}
public String toString() {
StringBuffer sb = new StringBuffer();
sb.append(this.getClass().getName());
sb.append('[');
if (!isOpen())
sb.append("closed");
else {
synchronized (stateLock) {
if (localAddress() == null) {
sb.append("unbound");
} else {
sb.append(localAddress().toString());
}
}
}
sb.append(']');
return sb.toString();
}
// -- Native methods --
private static native void listen(FileDescriptor fd, int backlog)
throws IOException;
// Accepts a new connection, setting the given file descriptor to refer to
// the new socket and setting isaa[0] to the socket's remote address.
// Returns 1 on success, or IOStatus.UNAVAILABLE (if non-blocking and no
// connections are pending) or IOStatus.INTERRUPTED.
//
private native int accept0(FileDescriptor ssfd, FileDescriptor newfd,
InetSocketAddress[] isaa)
throws IOException;
private static native void initIDs();
static {
Util.load();
initIDs();
nd = new SocketDispatcher();
}
}