| /* PlainDatagramSocketImpl.java -- Default DatagramSocket implementation |
| Copyright (C) 1998, 1999, 2001, 2003, 2004, 2005 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.net; |
| |
| import java.io.IOException; |
| import java.net.DatagramPacket; |
| import java.net.DatagramSocketImpl; |
| import java.net.InetAddress; |
| import java.net.NetworkInterface; |
| import java.net.SocketAddress; |
| import java.net.SocketException; |
| |
| /** |
| * Written using on-line Java Platform 1.2 API Specification, as well |
| * as "The Java Class Libraries", 2nd edition (Addison-Wesley, 1998). |
| * Status: Believed complete and correct. |
| */ |
| |
| /** |
| * This is the default socket implementation for datagram sockets. |
| * It makes native calls to C routines that implement BSD style |
| * SOCK_DGRAM sockets in the AF_INET family. |
| * |
| * @author Aaron M. Renn (arenn@urbanophile.com) |
| * @author Warren Levy (warrenl@cygnus.com) |
| */ |
| public final class PlainDatagramSocketImpl extends DatagramSocketImpl |
| { |
| |
| /** |
| * This is the actual underlying file descriptor |
| */ |
| int native_fd = -1; |
| |
| /** |
| * Lock object to serialize threads wanting to receive |
| */ |
| private final Object RECEIVE_LOCK = new Object(); |
| |
| /** |
| * Lock object to serialize threads wanting to send |
| */ |
| private final Object SEND_LOCK = new Object(); |
| |
| /** |
| * Default do nothing constructor |
| */ |
| public PlainDatagramSocketImpl() |
| { |
| // Nothing to do here. |
| } |
| |
| protected void finalize() throws Throwable |
| { |
| synchronized (this) |
| { |
| if (native_fd != -1) |
| close(); |
| } |
| super.finalize(); |
| } |
| |
| public int getNativeFD() |
| { |
| return native_fd; |
| } |
| |
| /** |
| * Binds this socket to a particular port and interface |
| * |
| * @param port The port to bind to |
| * @param addr The address to bind to |
| * |
| * @exception SocketException If an error occurs |
| */ |
| protected synchronized void bind(int port, InetAddress addr) |
| throws SocketException |
| { |
| VMPlainDatagramSocketImpl.bind(this, port, addr); |
| } |
| |
| /** |
| * Creates a new datagram socket |
| * |
| * @exception SocketException If an error occurs |
| */ |
| protected synchronized void create() throws SocketException |
| { |
| VMPlainDatagramSocketImpl.create(this); |
| } |
| |
| /** |
| * Connects to the remote address and port specified as arguments. |
| * |
| * @param addr The remote address to connect to |
| * @param port The remote port to connect to |
| * |
| * @exception SocketException If an error occurs |
| */ |
| protected void connect(InetAddress addr, int port) throws SocketException |
| { |
| VMPlainDatagramSocketImpl.connect(this, addr, port); |
| } |
| |
| /** |
| * Disconnects the socket. |
| * |
| * @since 1.4 |
| */ |
| protected void disconnect() |
| { |
| synchronized (this) |
| { |
| if (native_fd != -1) |
| close(); |
| } |
| } |
| |
| /** |
| * Sets the Time to Live value for the socket |
| * |
| * @param ttl The new TTL value |
| * |
| * @exception IOException If an error occurs |
| */ |
| protected synchronized void setTimeToLive(int ttl) throws IOException |
| { |
| setOption(VMPlainDatagramSocketImpl.IP_TTL, new Integer(ttl)); |
| } |
| |
| /** |
| * Gets the Time to Live value for the socket |
| * |
| * @return The TTL value |
| * |
| * @exception IOException If an error occurs |
| */ |
| protected synchronized int getTimeToLive() throws IOException |
| { |
| Object obj = getOption(VMPlainDatagramSocketImpl.IP_TTL); |
| |
| if (! (obj instanceof Integer)) |
| throw new IOException("Internal Error"); |
| |
| return ((Integer) obj).intValue(); |
| } |
| |
| |
| /** |
| * Sends a packet of data to a remote host |
| * |
| * @param packet The packet to send |
| * |
| * @exception IOException If an error occurs |
| */ |
| protected void send(DatagramPacket packet) throws IOException |
| { |
| if (native_fd != -1) |
| { |
| synchronized(SEND_LOCK) |
| { |
| VMPlainDatagramSocketImpl.send(this, packet); |
| } |
| } |
| } |
| |
| /** |
| * Receives a UDP packet from the network |
| * |
| * @param packet The packet to fill in with the data received |
| * |
| * @exception IOException IOException If an error occurs |
| */ |
| protected void receive(DatagramPacket packet) |
| throws IOException |
| { |
| synchronized(RECEIVE_LOCK) |
| { |
| VMPlainDatagramSocketImpl.receive(this, packet); |
| } |
| } |
| |
| |
| /** |
| * Sets the value of an option on the socket |
| * |
| * @param option_id The identifier of the option to set |
| * @param val The value of the option to set |
| * |
| * @exception SocketException If an error occurs |
| */ |
| public synchronized void setOption(int option_id, Object val) |
| throws SocketException |
| { |
| VMPlainDatagramSocketImpl.setOption(this, option_id, val); |
| } |
| |
| /** |
| * Retrieves the value of an option on the socket |
| * |
| * @param option_id The identifier of the option to retrieve |
| * |
| * @return The value of the option |
| * |
| * @exception SocketException If an error occurs |
| */ |
| public synchronized Object getOption(int option_id) |
| throws SocketException |
| { |
| return VMPlainDatagramSocketImpl.getOption(this, option_id); |
| } |
| |
| /** |
| * Closes the socket |
| */ |
| protected synchronized void close() |
| { |
| VMPlainDatagramSocketImpl.close(this); |
| } |
| |
| /** |
| * Gets the Time to Live value for the socket |
| * |
| * @return The TTL value |
| * |
| * @exception IOException If an error occurs |
| * |
| * @deprecated 1.2 |
| */ |
| protected synchronized byte getTTL() throws IOException |
| { |
| return (byte) getTimeToLive(); |
| } |
| |
| /** |
| * Sets the Time to Live value for the socket |
| * |
| * @param ttl The new TTL value |
| * |
| * @exception IOException If an error occurs |
| * |
| * @deprecated 1.2 |
| */ |
| protected synchronized void setTTL(byte ttl) throws IOException |
| { |
| setTimeToLive(((int) ttl) & 0xFF); |
| } |
| |
| /** |
| * Joins a multicast group |
| * |
| * @param addr The group to join |
| * |
| * @exception IOException If an error occurs |
| */ |
| protected synchronized void join(InetAddress addr) throws IOException |
| { |
| VMPlainDatagramSocketImpl.join(this,addr); |
| } |
| |
| /** |
| * Leaves a multicast group |
| * |
| * @param addr The group to leave |
| * |
| * @exception IOException If an error occurs |
| */ |
| protected synchronized void leave(InetAddress addr) throws IOException |
| { |
| VMPlainDatagramSocketImpl.leave(this, addr); |
| } |
| |
| /** |
| * What does this method really do? |
| */ |
| protected synchronized int peek(InetAddress addr) throws IOException |
| { |
| throw new IOException("Not Implemented Yet"); |
| } |
| |
| public int peekData(DatagramPacket packet) |
| { |
| throw new InternalError |
| ("PlainDatagramSocketImpl::peekData is not implemented"); |
| } |
| |
| public void joinGroup(SocketAddress address, NetworkInterface netIf) |
| throws IOException |
| { |
| VMPlainDatagramSocketImpl.joinGroup(this, address, netIf); |
| } |
| |
| public void leaveGroup(SocketAddress address, NetworkInterface netIf) |
| throws IOException |
| { |
| VMPlainDatagramSocketImpl.leaveGroup(this, address, netIf); |
| } |
| } |