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diff --git a/libjava/classpath/java/nio/channels/SelectableChannel.java b/libjava/classpath/java/nio/channels/SelectableChannel.java
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+/* SelectableChannel.java --
+   Copyright (C) 2002 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 java.nio.channels;
+
+import java.io.IOException;
+import java.nio.channels.spi.AbstractInterruptibleChannel;
+import java.nio.channels.spi.SelectorProvider;
+
+
+/**
+ * @author Michael Koch
+ * @since 1.4
+ */
+public abstract class SelectableChannel extends AbstractInterruptibleChannel
+{
+  /**
+   * Initializes the channel.
+   */
+  protected SelectableChannel()
+  {
+  }
+
+  /**
+   * Returns the lock of this channel.
+   */
+  public abstract Object blockingLock();
+
+  /**
+   * Adjusts this channel's blocking mode.
+   *
+   * @exception ClosedChannelException If this channel is closed.
+   * @exception IllegalBlockingModeException If block is true and this channel
+   * is registered with one or more selectors.
+   * @exception IOException If an error occurs.
+   */
+  public abstract SelectableChannel configureBlocking(boolean block)
+    throws IOException;
+
+  /**
+   * Tells whether this channel is blocking or not.
+   */
+  public abstract boolean isBlocking();
+
+  /**
+   * Tells whether or not this channel is currently registered with
+   * any selectors.
+   */
+  public abstract boolean isRegistered();
+
+  /**
+   * Retrieves the key representing the channel's registration with
+   * the given selector.
+   */
+  public abstract SelectionKey keyFor(Selector sel);
+
+  /**
+   * Returns the provider that created this channel.
+   */
+  public abstract SelectorProvider provider();
+
+  /**
+   * Registers this channel with the given selector,
+   * returning a selection key.
+   *
+   * @exception CancelledKeyException If this channel is currently registered
+   * with the given selector but the corresponding key has already been cancelled
+   * @exception ClosedChannelException If this channel is closed.
+   * @exception IllegalArgumentException If a bit in ops does not correspond
+   * to an operation that is supported by this channel, that is, if
+   * set &amp; ~validOps() != 0.
+   * @exception IllegalBlockingModeException If block is true and this channel
+   * is registered with one or more selectors.
+   * @exception IllegalSelectorException If this channel was not created by
+   * the same provider as the given selector.
+   */
+  public final SelectionKey register(Selector sel, int ops)
+    throws ClosedChannelException
+  {
+    return register(sel, ops, null);
+  }
+
+  /**
+   * Registers this channel with the given selector,
+   * returning a selection key.
+   *
+   * @exception CancelledKeyException If this channel is currently registered
+   * with the given selector but the corresponding key has already been
+   * cancelled.
+   * @exception ClosedChannelException If this channel is closed.
+   * @exception IllegalArgumentException If a bit in ops does not correspond
+   * to an operation that is supported by this channel, that is, if
+   * set &amp; ~validOps() != 0.
+   * @exception IllegalBlockingModeException If block is true and this channel
+   * is registered with one or more selectors.
+   * @exception IllegalSelectorException If this channel was not created by
+   * the same provider as the given selector.
+   */
+  public abstract SelectionKey register(Selector sel, int ops, Object att)
+    throws ClosedChannelException;
+
+  /**
+   * Returns a set of valid operations on this channel.
+   */
+  public abstract int validOps();
+}