| /* 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 gnu.classpath.Configuration; |
| |
| import java.io.IOException; |
| import java.net.DatagramPacket; |
| import java.net.DatagramSocketImpl; |
| import java.net.InetAddress; |
| import java.net.InetSocketAddress; |
| import java.net.NetworkInterface; |
| import java.net.SocketAddress; |
| import java.net.SocketException; |
| import java.net.SocketOptions; |
| |
| /** |
| * 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 |
| { |
| // Static initializer to load native library |
| static |
| { |
| if (Configuration.INIT_LOAD_LIBRARY) |
| { |
| System.loadLibrary("javanet"); |
| } |
| } |
| |
| // These fields are mirrored for use in native code to avoid cpp conflicts |
| // when the #defines in system header files are the same as the public fields. |
| static final int _Jv_TCP_NODELAY_ = SocketOptions.TCP_NODELAY, |
| _Jv_SO_BINDADDR_ = SocketOptions.SO_BINDADDR, |
| _Jv_SO_REUSEADDR_ = SocketOptions.SO_REUSEADDR, |
| _Jv_SO_BROADCAST_ = SocketOptions.SO_BROADCAST, |
| _Jv_SO_OOBINLINE_ = SocketOptions.SO_OOBINLINE, |
| _Jv_IP_MULTICAST_IF_ = SocketOptions.IP_MULTICAST_IF, |
| _Jv_IP_MULTICAST_IF2_ = SocketOptions.IP_MULTICAST_IF2, |
| _Jv_IP_MULTICAST_LOOP_ = SocketOptions.IP_MULTICAST_LOOP, |
| _Jv_IP_TOS_ = SocketOptions.IP_TOS, |
| _Jv_SO_LINGER_ = SocketOptions.SO_LINGER, |
| _Jv_SO_TIMEOUT_ = SocketOptions.SO_TIMEOUT, |
| _Jv_SO_SNDBUF_ = SocketOptions.SO_SNDBUF, |
| _Jv_SO_RCVBUF_ = SocketOptions.SO_RCVBUF, |
| _Jv_SO_KEEPALIVE_ = SocketOptions.SO_KEEPALIVE; |
| |
| /** |
| * 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(); |
| |
| // FIXME: Is this necessary? Could it help w/ DatagramSocket.getLocalAddress? |
| // InetAddress address; |
| |
| // localAddress cache |
| InetAddress localAddress; |
| |
| // 'timeout' is set/read by setOption/getOption. |
| int timeout = 0; |
| |
| /** |
| * Default do nothing constructor |
| */ |
| public PlainDatagramSocketImpl() |
| { |
| } |
| |
| 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 native void bind(int port, InetAddress addr) |
| throws SocketException; |
| |
| protected native void connect(InetAddress addr, int port) |
| throws SocketException; |
| |
| protected native void disconnect(); |
| |
| /** |
| * Creates a new datagram socket |
| * |
| * @exception SocketException If an error occurs |
| */ |
| protected native void create() throws SocketException; |
| |
| protected native int peek(InetAddress addr) throws IOException; |
| |
| protected native int peekData(DatagramPacket packet) throws IOException; |
| |
| /** |
| * Sets the Time to Live value for the socket |
| * |
| * @param ttl The new TTL value |
| * |
| * @exception IOException If an error occurs |
| */ |
| protected native void setTimeToLive(int ttl) throws IOException; |
| |
| /** |
| * Gets the Time to Live value for the socket |
| * |
| * @return The TTL value |
| * |
| * @exception IOException If an error occurs |
| */ |
| protected native int getTimeToLive() throws IOException; |
| |
| /** |
| * Sends a packet of data to a remote host |
| * |
| * @param packet The packet to send |
| * |
| * @exception IOException If an error occurs |
| */ |
| protected native void send(DatagramPacket packet) throws IOException; |
| |
| /** |
| * 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 native void receive(DatagramPacket packet) throws IOException; |
| |
| /** |
| * 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 native void setOption(int option_id, Object val) |
| throws SocketException; |
| |
| /** |
| * 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 native Object getOption(int option_id) |
| throws SocketException; |
| |
| /** |
| * Joins or leaves a broadcasting group on a given network interface. |
| * If the network interface is <code>null</code> the group is join/left on |
| * all locale network interfaces. |
| * |
| * @param inetAddr The broadcast address. |
| * @param netIf The network interface to join the group on. |
| * @param join True to join a broadcasting group, fals to leave it. |
| * |
| * @exception IOException If an error occurs. |
| */ |
| private native void mcastGrp(InetAddress inetAddr, NetworkInterface netIf, |
| boolean join) |
| throws IOException; |
| |
| /** |
| * Closes the socket |
| */ |
| protected native void close(); |
| |
| /** |
| * Gets the Time to Live value for the socket |
| * |
| * @return The TTL value |
| * |
| * @exception IOException If an error occurs |
| * |
| * @deprecated 1.2 |
| */ |
| protected 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 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 void join(InetAddress addr) throws IOException |
| { |
| mcastGrp(addr, null, true); |
| } |
| |
| /** |
| * Leaves a multicast group |
| * |
| * @param addr The group to leave |
| * |
| * @exception IOException If an error occurs |
| */ |
| protected void leave(InetAddress addr) throws IOException |
| { |
| mcastGrp(addr, null, false); |
| } |
| |
| protected void joinGroup(SocketAddress mcastaddr, NetworkInterface netIf) |
| throws IOException |
| { |
| mcastGrp(((InetSocketAddress) mcastaddr).getAddress(), netIf, true); |
| } |
| |
| protected void leaveGroup(SocketAddress mcastaddr, NetworkInterface netIf) |
| throws IOException |
| { |
| mcastGrp(((InetSocketAddress) mcastaddr).getAddress(), netIf, false); |
| } |
| } |