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/*
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* Copyright 2007 Sun Microsystems, Inc. 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. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any 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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/*
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* This class defines the plain SocketImpl that is used for all
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* Windows version 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 TwoStacksPlainSocketImpl extends AbstractPlainSocketImpl
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{
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/* second fd, used for ipv6 on windows only.
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* fd1 is used for listeners and for client sockets at initialization
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* until the socket is connected. Up to this point fd always refers
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* to the ipv4 socket and fd1 to the ipv6 socket. After the socket
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* becomes connected, fd always refers to the connected socket
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* (either v4 or v6) and fd1 is closed.
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*
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* For ServerSockets, fd always refers to the v4 listener and
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* fd1 the v6 listener.
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*/
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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 is bound to ::0 or 0.0.0.0, when a caller
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* asks for it. Otherwise we don't know which socket to ask.
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*/
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private InetAddress anyLocalBoundAddr = null;
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/* to prevent starvation when listening on two sockets, this is
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* is used to hold the id of the last socket we accepted on.
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*/
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private int lastfd = -1;
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static {
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initProto();
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}
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public TwoStacksPlainSocketImpl() {}
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public TwoStacksPlainSocketImpl(FileDescriptor fd) {
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this.fd = fd;
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}
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/**
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* Creates a socket with a boolean that specifies whether this
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* is a stream socket (true) or an unconnected UDP socket (false).
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*/
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protected synchronized void create(boolean stream) throws IOException {
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fd1 = new FileDescriptor();
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super.create(stream);
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}
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/**
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* Binds the socket to the specified address of the specified local port.
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* @param address the address
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* @param port the port
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*/
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protected synchronized void bind(InetAddress address, int lport)
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throws IOException
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{
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super.bind(address, lport);
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if (address.isAnyLocalAddress()) {
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anyLocalBoundAddr = address;
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}
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}
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public Object getOption(int opt) throws SocketException {
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if (isClosedOrPending()) {
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throw new SocketException("Socket Closed");
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}
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if (opt == SO_BINDADDR) {
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if (fd != null && fd1 != null ) {
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/* must be unbound or else bound to anyLocal */
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return anyLocalBoundAddr;
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}
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InetAddressContainer in = new InetAddressContainer();
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socketGetOption(opt, in);
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return in.addr;
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} else
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return super.getOption(opt);
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}
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/**
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* Closes the socket.
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*/
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protected void close() throws IOException {
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synchronized(fdLock) {
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if (fd != null || fd1 != null) {
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if (fdUseCount == 0) {
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if (closePending) {
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return;
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}
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closePending = true;
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socketClose();
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fd = null;
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fd1 = null;
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return;
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} else {
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/*
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* If a thread has acquired the fd and a close
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* isn't pending then use a deferred close.
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* Also decrement fdUseCount to signal the last
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* thread that releases the fd to close it.
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*/
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if (!closePending) {
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closePending = true;
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fdUseCount--;
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socketClose();
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}
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}
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}
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}
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}
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void reset() throws IOException {
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if (fd != null || fd1 != null) {
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socketClose();
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}
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fd = null;
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fd1 = null;
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super.reset();
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}
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/*
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* Return true if already closed or close is pending
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*/
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public boolean isClosedOrPending() {
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/*
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* Lock on fdLock to ensure that we wait if a
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* close is in progress.
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*/
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synchronized (fdLock) {
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if (closePending || (fd == null && fd1 == null)) {
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return true;
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} else {
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return false;
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}
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}
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}
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/* Native methods */
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static native void initProto();
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native void socketCreate(boolean isServer) throws IOException;
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native void socketConnect(InetAddress address, int port, int timeout)
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throws IOException;
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native void socketBind(InetAddress address, int port)
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throws IOException;
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native void socketListen(int count) throws IOException;
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native void socketAccept(SocketImpl s) throws IOException;
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native int socketAvailable() throws IOException;
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native void socketClose0(boolean useDeferredClose) throws IOException;
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native void socketShutdown(int howto) throws IOException;
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native void socketSetOption(int cmd, boolean on, Object value)
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throws SocketException;
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native int socketGetOption(int opt, Object iaContainerObj) throws SocketException;
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native int socketGetOption1(int opt, Object iaContainerObj, FileDescriptor fd)
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throws SocketException;
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native void socketSendUrgentData(int data) throws IOException;
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}
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