388 lines
13 KiB
Java
388 lines
13 KiB
Java
/*
|
|
* Copyright (c) 2008, 2013, 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
|
|
* or visit www.oracle.com if you need additional information or have any
|
|
* questions.
|
|
*/
|
|
|
|
package sun.nio.ch;
|
|
|
|
import java.nio.channels.*;
|
|
import java.util.concurrent.*;
|
|
import java.io.IOException;
|
|
import java.io.FileDescriptor;
|
|
import java.net.InetSocketAddress;
|
|
import java.util.concurrent.atomic.AtomicBoolean;
|
|
import java.security.AccessControlContext;
|
|
import java.security.AccessController;
|
|
import java.security.PrivilegedAction;
|
|
|
|
import dalvik.annotation.optimization.ReachabilitySensitive;
|
|
import dalvik.system.CloseGuard;
|
|
|
|
/**
|
|
* Unix implementation of AsynchronousServerSocketChannel
|
|
*/
|
|
|
|
class UnixAsynchronousServerSocketChannelImpl
|
|
extends AsynchronousServerSocketChannelImpl
|
|
implements Port.PollableChannel
|
|
{
|
|
private static final NativeDispatcher nd = new SocketDispatcher();
|
|
|
|
private final Port port;
|
|
private final int fdVal;
|
|
|
|
// flag to indicate an accept is outstanding
|
|
private final AtomicBoolean accepting = new AtomicBoolean();
|
|
private void enableAccept() {
|
|
accepting.set(false);
|
|
}
|
|
|
|
// used to ensure that the context for an asynchronous accept is visible
|
|
// the pooled thread that handles the I/O event
|
|
private final Object updateLock = new Object();
|
|
|
|
// pending accept
|
|
private boolean acceptPending;
|
|
private CompletionHandler<AsynchronousSocketChannel,Object> acceptHandler;
|
|
private Object acceptAttachment;
|
|
private PendingFuture<AsynchronousSocketChannel,Object> acceptFuture;
|
|
|
|
// context for permission check when security manager set
|
|
private AccessControlContext acceptAcc;
|
|
|
|
// Android-added: CloseGuard support.
|
|
@ReachabilitySensitive
|
|
private final CloseGuard guard = CloseGuard.get();
|
|
|
|
|
|
UnixAsynchronousServerSocketChannelImpl(Port port)
|
|
throws IOException
|
|
{
|
|
super(port);
|
|
|
|
try {
|
|
IOUtil.configureBlocking(fd, false);
|
|
} catch (IOException x) {
|
|
nd.close(fd); // prevent leak
|
|
throw x;
|
|
}
|
|
this.port = port;
|
|
this.fdVal = IOUtil.fdVal(fd);
|
|
|
|
// add mapping from file descriptor to this channel
|
|
port.register(fdVal, this);
|
|
// Android-added: CloseGuard support.
|
|
guard.open("close");
|
|
}
|
|
|
|
@Override
|
|
void implClose() throws IOException {
|
|
// Android-added: CloseGuard support.
|
|
guard.close();
|
|
// remove the mapping
|
|
port.unregister(fdVal);
|
|
|
|
// close file descriptor
|
|
nd.close(fd);
|
|
|
|
// if there is a pending accept then complete it
|
|
CompletionHandler<AsynchronousSocketChannel,Object> handler;
|
|
Object att;
|
|
PendingFuture<AsynchronousSocketChannel,Object> future;
|
|
synchronized (updateLock) {
|
|
if (!acceptPending)
|
|
return; // no pending accept
|
|
acceptPending = false;
|
|
handler = acceptHandler;
|
|
att = acceptAttachment;
|
|
future = acceptFuture;
|
|
}
|
|
|
|
// discard the stack trace as otherwise it may appear that implClose
|
|
// has thrown the exception.
|
|
AsynchronousCloseException x = new AsynchronousCloseException();
|
|
x.setStackTrace(new StackTraceElement[0]);
|
|
if (handler == null) {
|
|
future.setFailure(x);
|
|
} else {
|
|
// invoke by submitting task rather than directly
|
|
Invoker.invokeIndirectly(this, handler, att, null, x);
|
|
}
|
|
}
|
|
|
|
// Android-added: CloseGuard support.
|
|
protected void finalize() throws Throwable {
|
|
try {
|
|
if (guard != null) {
|
|
guard.warnIfOpen();
|
|
}
|
|
close();
|
|
} finally {
|
|
super.finalize();
|
|
}
|
|
}
|
|
|
|
@Override
|
|
public AsynchronousChannelGroupImpl group() {
|
|
return port;
|
|
}
|
|
|
|
/**
|
|
* Invoked by event handling thread when listener socket is polled
|
|
*/
|
|
@Override
|
|
public void onEvent(int events, boolean mayInvokeDirect) {
|
|
synchronized (updateLock) {
|
|
if (!acceptPending)
|
|
return; // may have been grabbed by asynchronous close
|
|
acceptPending = false;
|
|
}
|
|
|
|
// attempt to accept connection
|
|
FileDescriptor newfd = new FileDescriptor();
|
|
InetSocketAddress[] isaa = new InetSocketAddress[1];
|
|
Throwable exc = null;
|
|
try {
|
|
begin();
|
|
int n = accept(this.fd, newfd, isaa);
|
|
|
|
// spurious wakeup, is this possible?
|
|
if (n == IOStatus.UNAVAILABLE) {
|
|
synchronized (updateLock) {
|
|
acceptPending = true;
|
|
}
|
|
port.startPoll(fdVal, Net.POLLIN);
|
|
return;
|
|
}
|
|
|
|
} catch (Throwable x) {
|
|
if (x instanceof ClosedChannelException)
|
|
x = new AsynchronousCloseException();
|
|
exc = x;
|
|
} finally {
|
|
end();
|
|
}
|
|
|
|
// Connection accepted so finish it when not holding locks.
|
|
AsynchronousSocketChannel child = null;
|
|
if (exc == null) {
|
|
try {
|
|
child = finishAccept(newfd, isaa[0], acceptAcc);
|
|
} catch (Throwable x) {
|
|
if (!(x instanceof IOException) && !(x instanceof SecurityException))
|
|
x = new IOException(x);
|
|
exc = x;
|
|
}
|
|
}
|
|
|
|
// copy field befores accept is re-renabled
|
|
CompletionHandler<AsynchronousSocketChannel,Object> handler = acceptHandler;
|
|
Object att = acceptAttachment;
|
|
PendingFuture<AsynchronousSocketChannel,Object> future = acceptFuture;
|
|
|
|
// re-enable accepting and invoke handler
|
|
enableAccept();
|
|
|
|
if (handler == null) {
|
|
future.setResult(child, exc);
|
|
// if an async cancel has already cancelled the operation then
|
|
// close the new channel so as to free resources
|
|
if (child != null && future.isCancelled()) {
|
|
try {
|
|
child.close();
|
|
} catch (IOException ignore) { }
|
|
}
|
|
} else {
|
|
Invoker.invoke(this, handler, att, child, exc);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Completes the accept by creating the AsynchronousSocketChannel for
|
|
* the given file descriptor and remote address. If this method completes
|
|
* with an IOException or SecurityException then the channel/file descriptor
|
|
* will be closed.
|
|
*/
|
|
private AsynchronousSocketChannel finishAccept(FileDescriptor newfd,
|
|
final InetSocketAddress remote,
|
|
AccessControlContext acc)
|
|
throws IOException, SecurityException
|
|
{
|
|
AsynchronousSocketChannel ch = null;
|
|
try {
|
|
ch = new UnixAsynchronousSocketChannelImpl(port, newfd, remote);
|
|
} catch (IOException x) {
|
|
nd.close(newfd);
|
|
throw x;
|
|
}
|
|
|
|
// permission check must always be in initiator's context
|
|
try {
|
|
if (acc != null) {
|
|
AccessController.doPrivileged(new PrivilegedAction<>() {
|
|
public Void run() {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
sm.checkAccept(remote.getAddress().getHostAddress(),
|
|
remote.getPort());
|
|
}
|
|
return null;
|
|
}
|
|
}, acc);
|
|
} else {
|
|
SecurityManager sm = System.getSecurityManager();
|
|
if (sm != null) {
|
|
sm.checkAccept(remote.getAddress().getHostAddress(),
|
|
remote.getPort());
|
|
}
|
|
}
|
|
} catch (SecurityException x) {
|
|
try {
|
|
ch.close();
|
|
} catch (Throwable suppressed) {
|
|
x.addSuppressed(suppressed);
|
|
}
|
|
throw x;
|
|
}
|
|
return ch;
|
|
}
|
|
|
|
@Override
|
|
Future<AsynchronousSocketChannel> implAccept(Object att,
|
|
CompletionHandler<AsynchronousSocketChannel,Object> handler)
|
|
{
|
|
// complete immediately if channel is closed
|
|
if (!isOpen()) {
|
|
Throwable e = new ClosedChannelException();
|
|
if (handler == null) {
|
|
return CompletedFuture.withFailure(e);
|
|
} else {
|
|
Invoker.invoke(this, handler, att, null, e);
|
|
return null;
|
|
}
|
|
}
|
|
if (localAddress == null)
|
|
throw new NotYetBoundException();
|
|
|
|
// cancel was invoked with pending accept so connection may have been
|
|
// dropped.
|
|
if (isAcceptKilled())
|
|
throw new RuntimeException("Accept not allowed due cancellation");
|
|
|
|
// check and set flag to prevent concurrent accepting
|
|
if (!accepting.compareAndSet(false, true))
|
|
throw new AcceptPendingException();
|
|
|
|
// attempt accept
|
|
FileDescriptor newfd = new FileDescriptor();
|
|
InetSocketAddress[] isaa = new InetSocketAddress[1];
|
|
Throwable exc = null;
|
|
try {
|
|
begin();
|
|
|
|
int n = accept(this.fd, newfd, isaa);
|
|
if (n == IOStatus.UNAVAILABLE) {
|
|
|
|
// need calling context when there is security manager as
|
|
// permission check may be done in a different thread without
|
|
// any application call frames on the stack
|
|
PendingFuture<AsynchronousSocketChannel,Object> result = null;
|
|
synchronized (updateLock) {
|
|
if (handler == null) {
|
|
this.acceptHandler = null;
|
|
result = new PendingFuture<>(this);
|
|
this.acceptFuture = result;
|
|
} else {
|
|
this.acceptHandler = handler;
|
|
this.acceptAttachment = att;
|
|
}
|
|
this.acceptAcc = (System.getSecurityManager() == null) ?
|
|
null : AccessController.getContext();
|
|
this.acceptPending = true;
|
|
}
|
|
|
|
// register for connections
|
|
port.startPoll(fdVal, Net.POLLIN);
|
|
return result;
|
|
}
|
|
} catch (Throwable x) {
|
|
// accept failed
|
|
if (x instanceof ClosedChannelException)
|
|
x = new AsynchronousCloseException();
|
|
exc = x;
|
|
} finally {
|
|
end();
|
|
}
|
|
|
|
AsynchronousSocketChannel child = null;
|
|
if (exc == null) {
|
|
// connection accepted immediately
|
|
try {
|
|
child = finishAccept(newfd, isaa[0], null);
|
|
} catch (Throwable x) {
|
|
exc = x;
|
|
}
|
|
}
|
|
|
|
// re-enable accepting before invoking handler
|
|
enableAccept();
|
|
|
|
if (handler == null) {
|
|
return CompletedFuture.withResult(child, exc);
|
|
} else {
|
|
Invoker.invokeIndirectly(this, handler, att, child, exc);
|
|
return null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Accept a connection on a socket.
|
|
*
|
|
* @implNote Wrap native call to allow instrumentation.
|
|
*/
|
|
private int accept(FileDescriptor ssfd, FileDescriptor newfd,
|
|
InetSocketAddress[] isaa)
|
|
throws IOException
|
|
{
|
|
return accept0(ssfd, newfd, isaa);
|
|
}
|
|
|
|
// -- Native methods --
|
|
|
|
private static native void initIDs();
|
|
|
|
// 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.
|
|
//
|
|
private native int accept0(FileDescriptor ssfd, FileDescriptor newfd,
|
|
InetSocketAddress[] isaa)
|
|
throws IOException;
|
|
|
|
static {
|
|
// Android-removed: Code to load native libraries, doesn't make sense on Android.
|
|
// IOUtil.load();
|
|
initIDs();
|
|
}
|
|
}
|