ojluni/src/main/java/sun/nio/ch/SctpServerChannelImpl.java - platform/libcore - Git at Google

 /*
  * Copyright (c) 2009, 2010, 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.net.SocketAddress;
 import java.net.InetSocketAddress;
 import java.net.InetAddress;
 import java.io.FileDescriptor;
 import java.io.IOException;
 import java.util.Collections;
 import java.util.Set;
 import java.util.HashSet;
 import java.nio.channels.SelectionKey;
 import java.nio.channels.ClosedChannelException;
 import java.nio.channels.NotYetBoundException;
 import java.nio.channels.spi.SelectorProvider;
 import com.sun.nio.sctp.IllegalUnbindException;
 import com.sun.nio.sctp.SctpChannel;
 import com.sun.nio.sctp.SctpServerChannel;
 import com.sun.nio.sctp.SctpSocketOption;
 import com.sun.nio.sctp.SctpStandardSocketOptions;

 /**
  * An implementation of SctpServerChannel
  */
 public class SctpServerChannelImpl extends SctpServerChannel
     implements SelChImpl
 {
     private final FileDescriptor fd;

     private final int fdVal;

     /* IDs of native thread doing accept, 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();

     private enum ChannelState {
         UNINITIALIZED,
         INUSE,
         KILLPENDING,
         KILLED,
     }
     /* -- The following fields are protected by stateLock -- */
     private ChannelState state = ChannelState.UNINITIALIZED;

     /* Binding: Once bound the port will remain constant. */
     int port = -1;
     private HashSet<InetSocketAddress> localAddresses = new HashSet<InetSocketAddress>();
     /* Has the channel been bound to the wildcard address */
     private boolean wildcard; /* false */

     /* -- End of fields protected by stateLock -- */

     /**
      * Initializes a new instance of this class.
      */
     public SctpServerChannelImpl(SelectorProvider provider)
             throws IOException {
         //TODO: update provider remove public modifier
         super(provider);
         this.fd = SctpNet.socket(true);
         this.fdVal = IOUtil.fdVal(fd);
         this.state = ChannelState.INUSE;
     }

     @Override
     public SctpServerChannel bind(SocketAddress local, int backlog)
             throws IOException {
         synchronized (lock) {
             synchronized (stateLock) {
                 if (!isOpen())
                     throw new ClosedChannelException();
                 if (isBound())
                     SctpNet.throwAlreadyBoundException();

                 InetSocketAddress isa = (local == null) ?
                     new InetSocketAddress(0) : Net.checkAddress(local);
                 SecurityManager sm = System.getSecurityManager();
                 if (sm != null)
                     sm.checkListen(isa.getPort());
                 Net.bind(fd, isa.getAddress(), isa.getPort());

                 InetSocketAddress boundIsa = Net.localAddress(fd);
                 port = boundIsa.getPort();
                 localAddresses.add(isa);
                     if (isa.getAddress().isAnyLocalAddress())
                         wildcard = true;

                 SctpNet.listen(fdVal, backlog < 1 ? 50 : backlog);
             }
         }
         return this;
     }

     @Override
     public SctpServerChannel bindAddress(InetAddress address)
             throws IOException {
         return bindUnbindAddress(address, true);
     }

     @Override
     public SctpServerChannel unbindAddress(InetAddress address)
             throws IOException {
         return bindUnbindAddress(address, false);
     }

     private SctpServerChannel bindUnbindAddress(InetAddress address, boolean add)
             throws IOException {
         if (address == null)
             throw new IllegalArgumentException();

         synchronized (lock) {
             synchronized (stateLock) {
                 if (!isOpen())
                     throw new ClosedChannelException();
                 if (!isBound())
                     throw new NotYetBoundException();
                 if (wildcard)
                     throw new IllegalStateException(
                             "Cannot add or remove addresses from a channel that is bound to the wildcard address");
                 if (address.isAnyLocalAddress())
                     throw new IllegalArgumentException(
                             "Cannot add or remove the wildcard address");
                 if (add) {
                     for (InetSocketAddress addr : localAddresses) {
                         if (addr.getAddress().equals(address)) {
                             SctpNet.throwAlreadyBoundException();
                         }
                     }
                 } else { /*removing */
                     /* Verify that there is more than one address
                      * and that address is already bound */
                     if (localAddresses.size() <= 1)
                         throw new IllegalUnbindException("Cannot remove address from a channel with only one address bound");
                     boolean foundAddress = false;
                     for (InetSocketAddress addr : localAddresses) {
                         if (addr.getAddress().equals(address)) {
                             foundAddress = true;
                             break;
                         }
                     }
                     if (!foundAddress )
                         throw new IllegalUnbindException("Cannot remove address from a channel that is not bound to that address");
                 }

                 SctpNet.bindx(fdVal, new InetAddress[]{address}, port, add);

                 /* Update our internal Set to reflect the addition/removal */
                 if (add)
                     localAddresses.add(new InetSocketAddress(address, port));
                 else {
                     for (InetSocketAddress addr : localAddresses) {
                         if (addr.getAddress().equals(address)) {
                             localAddresses.remove(addr);
                             break;
                         }
                     }
                 }
             }
         }
         return this;
     }

     private boolean isBound() {
         synchronized (stateLock) {
             return port == -1 ? false : true;
         }
     }

     private void acceptCleanup() throws IOException {
         synchronized (stateLock) {
             thread = 0;
             if (state == ChannelState.KILLPENDING)
                 kill();
         }
     }

     @Override
     public SctpChannel accept() throws IOException {
         synchronized (lock) {
             if (!isOpen())
                 throw new ClosedChannelException();
             if (!isBound())
                 throw new NotYetBoundException();
             SctpChannel 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(fd, newfd, isaa);
                     if ((n == IOStatus.INTERRUPTED) && isOpen())
                         continue;
                     break;
                 }
             } finally {
                 acceptCleanup();
                 end(n > 0);
                 assert IOStatus.check(n);
             }

             if (n < 1)
                 return null;

             IOUtil.configureBlocking(newfd, true);
             InetSocketAddress isa = isaa[0];
             sc = new SctpChannelImpl(provider(), newfd);

             SecurityManager sm = System.getSecurityManager();
             if (sm != null)
                 sm.checkAccept(isa.getAddress().getHostAddress(),
                                isa.getPort());

             return sc;
         }
     }

     @Override
     protected void implConfigureBlocking(boolean block) throws IOException {
         IOUtil.configureBlocking(fd, block);
     }

     @Override
     public void implCloseSelectableChannel() throws IOException {
         synchronized (stateLock) {
             SctpNet.preClose(fdVal);
             if (thread != 0)
                 NativeThread.signal(thread);
             if (!isRegistered())
                 kill();
         }
     }

     @Override
     public void kill() throws IOException {
         synchronized (stateLock) {
             if (state == ChannelState.KILLED)
                 return;
             if (state == ChannelState.UNINITIALIZED) {
                 state = ChannelState.KILLED;
                 return;
             }
             assert !isOpen() && !isRegistered();

             // Postpone the kill if there is a thread in accept
             if (thread == 0) {
                 SctpNet.close(fdVal);
                 state = ChannelState.KILLED;
             } else {
                 state = ChannelState.KILLPENDING;
             }
         }
     }

     @Override
     public FileDescriptor getFD() {
         return fd;
     }

     @Override
     public int getFDVal() {
         return fdVal;
     }

     /**
      * Translates native poll revent ops into a ready operation ops
      */
     private boolean translateReadyOps(int ops, int initialOps,
                                      SelectionKeyImpl sk) {
         int intOps = sk.nioInterestOps();
         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;
     }

     @Override
     public boolean translateAndUpdateReadyOps(int ops, SelectionKeyImpl sk) {
         return translateReadyOps(ops, sk.nioReadyOps(), sk);
     }

     @Override
     public boolean translateAndSetReadyOps(int ops, SelectionKeyImpl sk) {
         return translateReadyOps(ops, 0, sk);
     }

     @Override
     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);

     }

     @Override
     public <T> SctpServerChannel setOption(SctpSocketOption<T> name, T value)
             throws IOException {
         if (name == null)
             throw new NullPointerException();
         if (!supportedOptions().contains(name))
             throw new UnsupportedOperationException("'" + name + "' not supported");

         synchronized (stateLock) {
             if (!isOpen())
                 throw new ClosedChannelException();

             SctpNet.setSocketOption(fdVal, name, value, 0 /*oneToOne*/);
             return this;
         }
     }

     @Override
     public <T> T getOption(SctpSocketOption<T> name) throws IOException {
         if (name == null)
             throw new NullPointerException();
         if (!supportedOptions().contains(name))
             throw new UnsupportedOperationException("'" + name + "' not supported");

         synchronized (stateLock) {
             if (!isOpen())
                 throw new ClosedChannelException();

             return (T) SctpNet.getSocketOption(fdVal, name, 0 /*oneToOne*/);
         }
     }

     private static class DefaultOptionsHolder {
         static final Set<SctpSocketOption<?>> defaultOptions = defaultOptions();

         private static Set<SctpSocketOption<?>> defaultOptions() {
             HashSet<SctpSocketOption<?>> set = new HashSet<SctpSocketOption<?>>(1);
             set.add(SctpStandardSocketOptions.SCTP_INIT_MAXSTREAMS);
             return Collections.unmodifiableSet(set);
         }
     }

     @Override
     public final Set<SctpSocketOption<?>> supportedOptions() {
         return DefaultOptionsHolder.defaultOptions;
     }

     @Override
     public Set<SocketAddress> getAllLocalAddresses()
             throws IOException {
         synchronized (stateLock) {
             if (!isOpen())
                 throw new ClosedChannelException();
             if (!isBound())
                 return Collections.EMPTY_SET;

             return SctpNet.getLocalAddresses(fdVal);
         }
     }

     /* Native */
     private static native void initIDs();

     private static native int accept0(FileDescriptor ssfd,
         FileDescriptor newfd, InetSocketAddress[] isaa) throws IOException;

     static {
         Util.load();   // loads nio & net native libraries
         java.security.AccessController.doPrivileged(
                 new sun.security.action.LoadLibraryAction("sctp"));
         initIDs();
     }
 }
	/*
	* Copyright (c) 2009, 2010, 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.net.SocketAddress;
	import java.net.InetSocketAddress;
	import java.net.InetAddress;
	import java.io.FileDescriptor;
	import java.io.IOException;
	import java.util.Collections;
	import java.util.Set;
	import java.util.HashSet;
	import java.nio.channels.SelectionKey;
	import java.nio.channels.ClosedChannelException;
	import java.nio.channels.NotYetBoundException;
	import java.nio.channels.spi.SelectorProvider;
	import com.sun.nio.sctp.IllegalUnbindException;
	import com.sun.nio.sctp.SctpChannel;
	import com.sun.nio.sctp.SctpServerChannel;
	import com.sun.nio.sctp.SctpSocketOption;
	import com.sun.nio.sctp.SctpStandardSocketOptions;

	/**
	* An implementation of SctpServerChannel
	*/
	public class SctpServerChannelImpl extends SctpServerChannel
	implements SelChImpl
	{
	private final FileDescriptor fd;

	private final int fdVal;

	/* IDs of native thread doing accept, 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();

	private enum ChannelState {
	UNINITIALIZED,
	INUSE,
	KILLPENDING,
	KILLED,
	}
	/* -- The following fields are protected by stateLock -- */
	private ChannelState state = ChannelState.UNINITIALIZED;

	/* Binding: Once bound the port will remain constant. */
	int port = -1;
	private HashSet<InetSocketAddress> localAddresses = new HashSet<InetSocketAddress>();
	/* Has the channel been bound to the wildcard address */
	private boolean wildcard; /* false */

	/* -- End of fields protected by stateLock -- */

	/**
	* Initializes a new instance of this class.
	*/
	public SctpServerChannelImpl(SelectorProvider provider)
	throws IOException {
	//TODO: update provider remove public modifier
	super(provider);
	this.fd = SctpNet.socket(true);
	this.fdVal = IOUtil.fdVal(fd);
	this.state = ChannelState.INUSE;
	}

	@Override
	public SctpServerChannel bind(SocketAddress local, int backlog)
	throws IOException {
	synchronized (lock) {
	synchronized (stateLock) {
	if (!isOpen())
	throw new ClosedChannelException();
	if (isBound())
	SctpNet.throwAlreadyBoundException();

	InetSocketAddress isa = (local == null) ?
	new InetSocketAddress(0) : Net.checkAddress(local);
	SecurityManager sm = System.getSecurityManager();
	if (sm != null)
	sm.checkListen(isa.getPort());
	Net.bind(fd, isa.getAddress(), isa.getPort());

	InetSocketAddress boundIsa = Net.localAddress(fd);
	port = boundIsa.getPort();
	localAddresses.add(isa);
	if (isa.getAddress().isAnyLocalAddress())
	wildcard = true;

	SctpNet.listen(fdVal, backlog < 1 ? 50 : backlog);
	}
	}
	return this;
	}

	@Override
	public SctpServerChannel bindAddress(InetAddress address)
	throws IOException {
	return bindUnbindAddress(address, true);
	}

	@Override
	public SctpServerChannel unbindAddress(InetAddress address)
	throws IOException {
	return bindUnbindAddress(address, false);
	}

	private SctpServerChannel bindUnbindAddress(InetAddress address, boolean add)
	throws IOException {
	if (address == null)
	throw new IllegalArgumentException();

	synchronized (lock) {
	synchronized (stateLock) {
	if (!isOpen())
	throw new ClosedChannelException();
	if (!isBound())
	throw new NotYetBoundException();
	if (wildcard)
	throw new IllegalStateException(
	"Cannot add or remove addresses from a channel that is bound to the wildcard address");
	if (address.isAnyLocalAddress())
	throw new IllegalArgumentException(
	"Cannot add or remove the wildcard address");
	if (add) {
	for (InetSocketAddress addr : localAddresses) {
	if (addr.getAddress().equals(address)) {
	SctpNet.throwAlreadyBoundException();
	}
	}
	} else { /removing /
	/* Verify that there is more than one address
	* and that address is already bound */
	if (localAddresses.size() <= 1)
	throw new IllegalUnbindException("Cannot remove address from a channel with only one address bound");
	boolean foundAddress = false;
	for (InetSocketAddress addr : localAddresses) {
	if (addr.getAddress().equals(address)) {
	foundAddress = true;
	break;
	}
	}
	if (!foundAddress )
	throw new IllegalUnbindException("Cannot remove address from a channel that is not bound to that address");
	}

	SctpNet.bindx(fdVal, new InetAddress[]{address}, port, add);

	/* Update our internal Set to reflect the addition/removal */
	if (add)
	localAddresses.add(new InetSocketAddress(address, port));
	else {
	for (InetSocketAddress addr : localAddresses) {
	if (addr.getAddress().equals(address)) {
	localAddresses.remove(addr);
	break;
	}
	}
	}
	}
	}
	return this;
	}

	private boolean isBound() {
	synchronized (stateLock) {
	return port == -1 ? false : true;
	}
	}

	private void acceptCleanup() throws IOException {
	synchronized (stateLock) {
	thread = 0;
	if (state == ChannelState.KILLPENDING)
	kill();
	}
	}

	@Override
	public SctpChannel accept() throws IOException {
	synchronized (lock) {
	if (!isOpen())
	throw new ClosedChannelException();
	if (!isBound())
	throw new NotYetBoundException();
	SctpChannel 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(fd, newfd, isaa);
	if ((n == IOStatus.INTERRUPTED) && isOpen())
	continue;
	break;
	}
	} finally {
	acceptCleanup();
	end(n > 0);
	assert IOStatus.check(n);
	}

	if (n < 1)
	return null;

	IOUtil.configureBlocking(newfd, true);
	InetSocketAddress isa = isaa[0];
	sc = new SctpChannelImpl(provider(), newfd);

	SecurityManager sm = System.getSecurityManager();
	if (sm != null)
	sm.checkAccept(isa.getAddress().getHostAddress(),
	isa.getPort());

	return sc;
	}
	}

	@Override
	protected void implConfigureBlocking(boolean block) throws IOException {
	IOUtil.configureBlocking(fd, block);
	}

	@Override
	public void implCloseSelectableChannel() throws IOException {
	synchronized (stateLock) {
	SctpNet.preClose(fdVal);
	if (thread != 0)
	NativeThread.signal(thread);
	if (!isRegistered())
	kill();
	}
	}

	@Override
	public void kill() throws IOException {
	synchronized (stateLock) {
	if (state == ChannelState.KILLED)
	return;
	if (state == ChannelState.UNINITIALIZED) {
	state = ChannelState.KILLED;
	return;
	}
	assert !isOpen() && !isRegistered();

	// Postpone the kill if there is a thread in accept
	if (thread == 0) {
	SctpNet.close(fdVal);
	state = ChannelState.KILLED;
	} else {
	state = ChannelState.KILLPENDING;
	}
	}
	}

	@Override
	public FileDescriptor getFD() {
	return fd;
	}

	@Override
	public int getFDVal() {
	return fdVal;
	}

	/**
	* Translates native poll revent ops into a ready operation ops
	*/
	private boolean translateReadyOps(int ops, int initialOps,
	SelectionKeyImpl sk) {
	int intOps = sk.nioInterestOps();
	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;
	}

	@Override
	public boolean translateAndUpdateReadyOps(int ops, SelectionKeyImpl sk) {
	return translateReadyOps(ops, sk.nioReadyOps(), sk);
	}

	@Override
	public boolean translateAndSetReadyOps(int ops, SelectionKeyImpl sk) {
	return translateReadyOps(ops, 0, sk);
	}

	@Override
	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);

	}

	@Override
	public <T> SctpServerChannel setOption(SctpSocketOption<T> name, T value)
	throws IOException {
	if (name == null)
	throw new NullPointerException();
	if (!supportedOptions().contains(name))
	throw new UnsupportedOperationException("'" + name + "' not supported");

	synchronized (stateLock) {
	if (!isOpen())
	throw new ClosedChannelException();

	SctpNet.setSocketOption(fdVal, name, value, 0 /oneToOne/);
	return this;
	}
	}

	@Override
	public <T> T getOption(SctpSocketOption<T> name) throws IOException {
	if (name == null)
	throw new NullPointerException();
	if (!supportedOptions().contains(name))
	throw new UnsupportedOperationException("'" + name + "' not supported");

	synchronized (stateLock) {
	if (!isOpen())
	throw new ClosedChannelException();

	return (T) SctpNet.getSocketOption(fdVal, name, 0 /oneToOne/);
	}
	}

	private static class DefaultOptionsHolder {
	static final Set<SctpSocketOption<?>> defaultOptions = defaultOptions();

	private static Set<SctpSocketOption<?>> defaultOptions() {
	HashSet<SctpSocketOption<?>> set = new HashSet<SctpSocketOption<?>>(1);
	set.add(SctpStandardSocketOptions.SCTP_INIT_MAXSTREAMS);
	return Collections.unmodifiableSet(set);
	}
	}

	@Override
	public final Set<SctpSocketOption<?>> supportedOptions() {
	return DefaultOptionsHolder.defaultOptions;
	}

	@Override
	public Set<SocketAddress> getAllLocalAddresses()
	throws IOException {
	synchronized (stateLock) {
	if (!isOpen())
	throw new ClosedChannelException();
	if (!isBound())
	return Collections.EMPTY_SET;

	return SctpNet.getLocalAddresses(fdVal);
	}
	}

	/* Native */
	private static native void initIDs();

	private static native int accept0(FileDescriptor ssfd,
	FileDescriptor newfd, InetSocketAddress[] isaa) throws IOException;

	static {
	Util.load(); // loads nio & net native libraries
	java.security.AccessController.doPrivileged(
	new sun.security.action.LoadLibraryAction("sctp"));
	initIDs();
	}
	}