author | khazra |
Thu, 14 Mar 2013 13:46:15 -0700 | |
changeset 18192 | fa6bd0992104 |
parent 16870 | f35b2bd19761 |
child 23010 | 6dadb192ad81 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package java.net; |
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import java.io.IOException; |
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import java.io.FileDescriptor; |
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import sun.net.ResourceManager; |
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/** |
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* This class defines the plain DatagramSocketImpl that is used for all |
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* Windows versions lower than Vista. It adds support for IPv6 on |
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* these platforms where available. |
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* |
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* For backward compatibility windows platforms that do not have IPv6 |
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* support also use this implementation, and fd1 gets set to null |
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* during socket creation. |
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* |
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* @author Chris Hegarty |
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*/ |
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class TwoStacksPlainDatagramSocketImpl extends AbstractPlainDatagramSocketImpl |
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{ |
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/* Used for IPv6 on Windows only */ |
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private FileDescriptor fd1; |
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/* |
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* Needed for ipv6 on windows because we need to know |
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* if the socket was bound to ::0 or 0.0.0.0, when a caller |
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* asks for it. In this case, both sockets are used, but we |
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* don't know whether the caller requested ::0 or 0.0.0.0 |
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* and need to remember it here. |
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*/ |
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private InetAddress anyLocalBoundAddr=null; |
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private int fduse=-1; /* saved between peek() and receive() calls */ |
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/* saved between successive calls to receive, if data is detected |
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* on both sockets at same time. To ensure that one socket is not |
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* starved, they rotate using this field |
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*/ |
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private int lastfd=-1; |
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static { |
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init(); |
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} |
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// true if this socket is exclusively bound |
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private final boolean exclusiveBind; |
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/* |
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* Set to true if SO_REUSEADDR is set after the socket is bound to |
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* indicate SO_REUSEADDR is being emulated |
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*/ |
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private boolean reuseAddressEmulated; |
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// emulates SO_REUSEADDR when exclusiveBind is true and socket is bound |
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private boolean isReuseAddress; |
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TwoStacksPlainDatagramSocketImpl(boolean exclBind) { |
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exclusiveBind = exclBind; |
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} |
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protected synchronized void create() throws SocketException { |
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fd1 = new FileDescriptor(); |
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try { |
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super.create(); |
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} catch (SocketException e) { |
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fd1 = null; |
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throw e; |
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} |
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} |
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protected synchronized void bind(int lport, InetAddress laddr) |
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throws SocketException { |
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super.bind(lport, laddr); |
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if (laddr.isAnyLocalAddress()) { |
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anyLocalBoundAddr = laddr; |
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} |
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} |
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@Override |
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protected synchronized void bind0(int lport, InetAddress laddr) |
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throws SocketException |
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{ |
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bind0(lport, laddr, exclusiveBind); |
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} |
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protected synchronized void receive(DatagramPacket p) |
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throws IOException { |
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try { |
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receive0(p); |
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} finally { |
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fduse = -1; |
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} |
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} |
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public Object getOption(int optID) throws SocketException { |
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if (isClosed()) { |
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throw new SocketException("Socket Closed"); |
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} |
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if (optID == SO_BINDADDR) { |
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if ((fd != null && fd1 != null) && !connected) { |
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return anyLocalBoundAddr; |
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} |
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int family = connectedAddress == null ? -1 : connectedAddress.holder().getFamily(); |
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return socketLocalAddress(family); |
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} else if (optID == SO_REUSEADDR && reuseAddressEmulated) { |
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return isReuseAddress; |
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} else { |
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return super.getOption(optID); |
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} |
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} |
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protected void socketSetOption(int opt, Object val) |
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throws SocketException |
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{ |
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if (opt == SO_REUSEADDR && exclusiveBind && localPort != 0) { |
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// socket already bound, emulate |
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reuseAddressEmulated = true; |
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isReuseAddress = (Boolean)val; |
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} else { |
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socketNativeSetOption(opt, val); |
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} |
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} |
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protected boolean isClosed() { |
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return (fd == null && fd1 == null) ? true : false; |
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} |
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protected void close() { |
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if (fd != null || fd1 != null) { |
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datagramSocketClose(); |
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ResourceManager.afterUdpClose(); |
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fd = null; |
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fd1 = null; |
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} |
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} |
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/* Native methods */ |
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protected synchronized native void bind0(int lport, InetAddress laddr, |
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boolean exclBind) |
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throws SocketException; |
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protected native void send(DatagramPacket p) throws IOException; |
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protected synchronized native int peek(InetAddress i) throws IOException; |
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protected synchronized native int peekData(DatagramPacket p) throws IOException; |
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protected synchronized native void receive0(DatagramPacket p) |
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throws IOException; |
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protected native void setTimeToLive(int ttl) throws IOException; |
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protected native int getTimeToLive() throws IOException; |
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@Deprecated |
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protected native void setTTL(byte ttl) throws IOException; |
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@Deprecated |
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protected native byte getTTL() throws IOException; |
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protected native void join(InetAddress inetaddr, NetworkInterface netIf) |
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throws IOException; |
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protected native void leave(InetAddress inetaddr, NetworkInterface netIf) |
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throws IOException; |
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protected native void datagramSocketCreate() throws SocketException; |
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protected native void datagramSocketClose(); |
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protected native void socketNativeSetOption(int opt, Object val) |
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throws SocketException; |
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protected native Object socketGetOption(int opt) throws SocketException; |
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protected native void connect0(InetAddress address, int port) throws SocketException; |
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protected native Object socketLocalAddress(int family) throws SocketException; |
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protected native void disconnect0(int family); |
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/** |
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* Perform class load-time initializations. |
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*/ |
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private native static void init(); |
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} |