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diff --git a/libjava/gnu/java/nio/DatagramChannelImpl.java b/libjava/gnu/java/nio/DatagramChannelImpl.java
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+++ b/libjava/gnu/java/nio/DatagramChannelImpl.java
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+/* DatagramChannelImpl.java -- 
+   Copyright (C) 2002, 2003, 2004, 2006  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.nio;
+
+import gnu.java.net.PlainDatagramSocketImpl;
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
+import java.net.SocketTimeoutException;
+import java.nio.ByteBuffer;
+import java.nio.channels.ClosedChannelException;
+import java.nio.channels.DatagramChannel;
+import java.nio.channels.NotYetConnectedException;
+import java.nio.channels.spi.SelectorProvider;
+
+/**
+ * @author Michael Koch
+ */
+public final class DatagramChannelImpl extends DatagramChannel
+{
+  private NIODatagramSocket socket;
+  
+  /**
+   * Indicates whether this channel initiated whatever operation
+   * is being invoked on our datagram socket.
+   */
+  private boolean inChannelOperation;
+
+  /**
+   * Indicates whether our datagram socket should ignore whether
+   * we are set to non-blocking mode. Certain operations on our
+   * socket throw an <code>IllegalBlockingModeException</code> if
+   * we are in non-blocking mode, <i>except</i> if the operation
+   * is initiated by us.
+   */
+  public final boolean isInChannelOperation()
+  {
+    return inChannelOperation;
+  }
+  
+  /**
+   * Sets our indicator of whether we are initiating an I/O operation
+   * on our socket.
+   */
+  public final void setInChannelOperation(boolean b)
+  {
+    inChannelOperation = b;
+  }
+ 
+  protected DatagramChannelImpl (SelectorProvider provider)
+    throws IOException
+  {
+    super (provider);
+    socket = new NIODatagramSocket (new PlainDatagramSocketImpl(), this);
+    configureBlocking(true);
+  }
+
+  public int getNativeFD()
+  {
+    return socket.getPlainDatagramSocketImpl().getNativeFD();
+  }
+    
+  public DatagramSocket socket ()
+  {
+    return socket;
+  }
+    
+  protected void implCloseSelectableChannel ()
+    throws IOException
+  {
+    socket.close ();
+  }
+    
+  protected void implConfigureBlocking (boolean blocking)
+    throws IOException
+  {
+    socket.setSoTimeout (blocking ? 0 : NIOConstants.DEFAULT_TIMEOUT);
+  }
+
+  public DatagramChannel connect (SocketAddress remote)
+    throws IOException
+  {
+    if (!isOpen())
+      throw new ClosedChannelException();
+    
+    socket.connect (remote);
+    return this;
+  }
+    
+  public DatagramChannel disconnect ()
+    throws IOException
+  {
+    socket.disconnect ();
+    return this;
+  }
+    
+  public boolean isConnected ()
+  {
+    return socket.isConnected ();
+  }
+    
+  public int write (ByteBuffer src)
+    throws IOException
+  {
+    if (!isConnected ())
+      throw new NotYetConnectedException ();
+    
+    return send (src, socket.getRemoteSocketAddress());
+  }
+
+  public long write (ByteBuffer[] srcs, int offset, int length)
+    throws IOException
+  {
+    if (!isConnected())
+      throw new NotYetConnectedException();
+
+    if ((offset < 0)
+        || (offset > srcs.length)
+        || (length < 0)
+        || (length > (srcs.length - offset)))
+      throw new IndexOutOfBoundsException();
+      
+    long result = 0;
+
+    for (int index = offset; index < offset + length; index++)
+      result += write (srcs [index]);
+
+    return result;
+  }
+
+  public int read (ByteBuffer dst)
+    throws IOException
+  {
+    if (!isConnected ())
+      throw new NotYetConnectedException ();
+    
+    int remaining = dst.remaining();
+    receive (dst);
+    return remaining - dst.remaining();
+  }
+    
+  public long read (ByteBuffer[] dsts, int offset, int length)
+    throws IOException
+  {
+    if (!isConnected())
+      throw new NotYetConnectedException();
+    
+    if ((offset < 0)
+        || (offset > dsts.length)
+        || (length < 0)
+        || (length > (dsts.length - offset)))
+      throw new IndexOutOfBoundsException();
+      
+    long result = 0;
+
+    for (int index = offset; index < offset + length; index++)
+      result += read (dsts [index]);
+
+    return result;
+  }
+    
+  public SocketAddress receive (ByteBuffer dst)
+    throws IOException
+  {
+    if (!isOpen())
+      throw new ClosedChannelException();
+    
+    try
+      {
+        DatagramPacket packet;
+        int len = dst.remaining();
+        
+        if (dst.hasArray())
+          {
+            packet = new DatagramPacket (dst.array(),
+                                         dst.arrayOffset() + dst.position(),
+                                         len);
+          }
+        else
+          {
+            packet = new DatagramPacket (new byte [len], len);
+          }
+
+        boolean completed = false;
+
+        try
+          {
+            begin();
+            setInChannelOperation(true);
+            socket.receive (packet);
+            completed = true;
+          }
+        finally
+          {
+            end (completed);
+            setInChannelOperation(false);
+          }
+
+        if (!dst.hasArray())
+          {
+            dst.put (packet.getData(), packet.getOffset(), packet.getLength());
+          }
+        else
+          {
+            dst.position (dst.position() + packet.getLength());
+          }
+
+        return packet.getSocketAddress();
+      }
+    catch (SocketTimeoutException e)
+      {
+        return null;
+      }
+  }
+    
+  public int send (ByteBuffer src, SocketAddress target)
+    throws IOException
+  {
+    if (!isOpen())
+      throw new ClosedChannelException();
+    
+    if (target instanceof InetSocketAddress
+	&& ((InetSocketAddress) target).isUnresolved())
+      throw new IOException("Target address not resolved");
+
+    byte[] buffer;
+    int offset = 0;
+    int len = src.remaining();
+    
+    if (src.hasArray())
+      {
+        buffer = src.array();
+        offset = src.arrayOffset() + src.position();
+      }
+    else
+      {
+        buffer = new byte [len];
+        src.get (buffer);
+      }
+
+    DatagramPacket packet = new DatagramPacket (buffer, offset, len, target);
+
+    boolean completed = false;
+    try
+      {
+        begin();
+        setInChannelOperation(true);
+        socket.send(packet);
+        completed = true;
+      }
+    finally
+      {
+        end (completed);
+        setInChannelOperation(false);
+      }
+      
+    if (src.hasArray())
+      {
+	src.position (src.position() + len);
+      }
+
+    return len;
+  }
+}