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jeremybenn |
/* PlainDatagramSocketImpl.java -- VM interface for DatagramSocket impl
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.net;
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import gnu.classpath.Configuration;
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import java.io.IOException;
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import java.net.DatagramPacket;
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import java.net.InetAddress;
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import java.net.NetworkInterface;
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import java.net.SocketAddress;
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import java.net.SocketException;
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/**
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* The VM interface for {@link gnu.java.net.PlainDatagramSocketImpl}.
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*
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* @author Ingo Proetel (proetel@aicas.com)
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* @author Roman Kennke (kennke@aicas.com)
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*/
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public final class VMPlainDatagramSocketImpl
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{
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/**
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* Option id for the IP_TTL (time to live) value.
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*/
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static final int IP_TTL = 0x1E61; // 7777
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// Static initializer to load native library
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static
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{
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if (Configuration.INIT_LOAD_LIBRARY)
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{
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System.loadLibrary("javanet");
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}
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}
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/**
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* Binds this socket to a particular port and interface
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*
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* @param socket the socket object
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* @param port the port to bind to
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* @param addr the address to bind to
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*
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* @throws SocketException If an error occurs
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*/
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static native void bind(PlainDatagramSocketImpl socket, int port,
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InetAddress addr)
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throws SocketException;
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/**
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* Creates a new datagram socket.
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*
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* @param socket the socket object
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*
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* @throws SocketException If an error occurs
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*/
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static native void create(PlainDatagramSocketImpl socket)
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throws SocketException;
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/**
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* Connects to the remote address and port specified as arguments.
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*
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* @param socket the socket object
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* @param addr the remote address to connect to
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* @param port the remote port to connect to
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*
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* @throws SocketException If an error occurs
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*/
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static native void connect(PlainDatagramSocketImpl socket, InetAddress addr,
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int port)
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throws SocketException;
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/**
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* Sends a packet of data to a remote host.
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*
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* @param socket the socket object
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* @param packet the packet to send
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*
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* @throws IOException If an error occurs
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*/
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static void send(PlainDatagramSocketImpl socket, DatagramPacket packet)
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throws IOException
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{
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nativeSendTo(socket, packet.getAddress(), packet.getPort(),
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packet.getData(), packet.getOffset(), packet.getLength());
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}
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/**
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* Sends a packet of data to a remote host.
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*
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* @param socket the socket object
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* @param addr the address to send to
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* @param port the port to send to
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* @param buf the buffer to send
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* @param offset the offset of the data in the buffer to send
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* @param len the length of the data to send
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*
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* @throws IOException If an error occurs
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*/
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private static native void nativeSendTo(PlainDatagramSocketImpl socket,
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InetAddress addr, int port,
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byte[] buf, int offset, int len)
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throws IOException;
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/**
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* Receives a UDP packet from the network
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*
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* @param socket the socket object
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* @param packet the packet to fill in with the data received
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*
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* @throws IOException IOException If an error occurs
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*/
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static void receive(PlainDatagramSocketImpl socket, DatagramPacket packet)
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throws IOException
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{
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byte[] receiveFromAddress = new byte[4];
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int[] receiveFromPort = new int[1];
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int[] receivedLength = new int[1];
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nativeReceive(socket, packet.getData(), packet.getOffset(),
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packet.getLength(),
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receiveFromAddress, receiveFromPort, receivedLength);
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packet.setAddress(InetAddress.getByAddress(receiveFromAddress));
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packet.setPort(receiveFromPort[0]);
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packet.setLength(receivedLength[0]);
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}
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private static native void nativeReceive(PlainDatagramSocketImpl socket,
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byte[] buf, int offset, int len,
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byte[] receiveFromAddress,
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int[] receiveFromPort,
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int[] receivedLength)
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throws IOException;
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/**
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* Sets the value of an option on the socket
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*
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* @param socket the socket object
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* @param optionId the identifier of the option to set
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* @param value the value of the option to set
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*
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* @exception SocketException If an error occurs
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*/
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static native void setOption(PlainDatagramSocketImpl socket, int optionId,
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Object value)
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throws SocketException;
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/**
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* Retrieves the value of an option on the socket.
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*
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* @param socket the socket object
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* @param optionId the identifier of the option to retrieve
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*
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* @return the value of the option
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*
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* @throws SocketException if an error occurs
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*/
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static native Object getOption(PlainDatagramSocketImpl socket, int optionId)
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throws SocketException;
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/**
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* Closes the socket.
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*
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* @param socket the socket object
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*/
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static native void close(PlainDatagramSocketImpl socket);
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/**
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* Joins a multicast group
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*
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* @param addr The group to join
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*
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* @exception IOException If an error occurs
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*/
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static native void join(PlainDatagramSocketImpl socket, InetAddress addr)
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throws IOException;
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/**
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* Leaves a multicast group
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*
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* @param addr The group to leave
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*
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* @exception IOException If an error occurs
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*/
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static native void leave(PlainDatagramSocketImpl socket, InetAddress addr)
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throws IOException;
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/**
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* Joins a multicast group.
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*
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* @param socket the socket object
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* @param address the socket address
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* @param netIf the network interface
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*
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* @throws IOException if I/O errors occur
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*/
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static void joinGroup(PlainDatagramSocketImpl socket, SocketAddress address,
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NetworkInterface netIf)
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throws IOException
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{
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throw new InternalError
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("PlainDatagramSocketImpl::joinGroup is not implemented");
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}
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/**
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* Leaves a multicast group.
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*
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* @param socket the socket object
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* @param address the socket address
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* @param netIf the network interface
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*
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* @throws IOException if I/O errors occur
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*/
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static void leaveGroup(PlainDatagramSocketImpl socket, SocketAddress address,
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NetworkInterface netIf)
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throws IOException
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{
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throw new InternalError
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("PlainDatagramSocketImpl::leaveGroup is not implemented");
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}
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}
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