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/*
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* Copyright 1995-2008 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.InputStream;
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import java.io.OutputStream;
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import java.io.InterruptedIOException;
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import java.io.FileDescriptor;
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import java.io.ByteArrayOutputStream;
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import sun.net.ConnectionResetException;
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/**
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* Default Socket Implementation. This implementation does
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* not implement any security checks.
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* Note this class should <b>NOT</b> be public.
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*
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* @author Steven B. Byrne
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*/
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abstract class AbstractPlainSocketImpl extends SocketImpl
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{
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/* instance variable for SO_TIMEOUT */
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int timeout; // timeout in millisec
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// traffic class
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private int trafficClass;
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private boolean shut_rd = false;
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private boolean shut_wr = false;
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private SocketInputStream socketInputStream = null;
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/* number of threads using the FileDescriptor */
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protected int fdUseCount = 0;
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/* lock when increment/decrementing fdUseCount */
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protected Object fdLock = new Object();
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/* indicates a close is pending on the file descriptor */
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protected boolean closePending = false;
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/* indicates connection reset state */
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private int CONNECTION_NOT_RESET = 0;
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private int CONNECTION_RESET_PENDING = 1;
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private int CONNECTION_RESET = 2;
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private int resetState;
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private Object resetLock = new Object();
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/**
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* Load net library into runtime.
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*/
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static {
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java.security.AccessController.doPrivileged(
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new sun.security.action.LoadLibraryAction("net"));
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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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fd = new FileDescriptor();
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socketCreate(stream);
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if (socket != null)
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socket.setCreated();
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if (serverSocket != null)
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serverSocket.setCreated();
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}
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/**
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* Creates a socket and connects it to the specified port on
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* the specified host.
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* @param host the specified host
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* @param port the specified port
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*/
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protected void connect(String host, int port)
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throws UnknownHostException, IOException
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{
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IOException pending = null;
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try {
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InetAddress address = InetAddress.getByName(host);
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this.port = port;
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this.address = address;
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try {
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connectToAddress(address, port, timeout);
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return;
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} catch (IOException e) {
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pending = e;
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}
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} catch (UnknownHostException e) {
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pending = e;
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}
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// everything failed
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close();
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throw pending;
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}
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/**
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* Creates a socket and connects it to the specified address on
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* the specified port.
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* @param address the address
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* @param port the specified port
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*/
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protected void connect(InetAddress address, int port) throws IOException {
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this.port = port;
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this.address = address;
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try {
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connectToAddress(address, port, timeout);
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return;
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} catch (IOException e) {
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// everything failed
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close();
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throw e;
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}
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}
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/**
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* Creates a socket and connects it to the specified address on
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* the specified port.
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* @param address the address
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* @param timeout the timeout value in milliseconds, or zero for no timeout.
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* @throws IOException if connection fails
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* @throws IllegalArgumentException if address is null or is a
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* SocketAddress subclass not supported by this socket
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* @since 1.4
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*/
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protected void connect(SocketAddress address, int timeout) throws IOException {
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if (address == null || !(address instanceof InetSocketAddress))
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throw new IllegalArgumentException("unsupported address type");
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InetSocketAddress addr = (InetSocketAddress) address;
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if (addr.isUnresolved())
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throw new UnknownHostException(addr.getHostName());
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this.port = addr.getPort();
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this.address = addr.getAddress();
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try {
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connectToAddress(this.address, port, timeout);
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return;
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} catch (IOException e) {
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// everything failed
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close();
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throw e;
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}
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}
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private void connectToAddress(InetAddress address, int port, int timeout) throws IOException {
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if (address.isAnyLocalAddress()) {
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doConnect(InetAddress.getLocalHost(), port, timeout);
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} else {
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doConnect(address, port, timeout);
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}
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}
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public void setOption(int opt, Object val) 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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boolean on = true;
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switch (opt) {
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/* check type safety b4 going native. These should never
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* fail, since only java.Socket* has access to
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* PlainSocketImpl.setOption().
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*/
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case SO_LINGER:
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if (val == null || (!(val instanceof Integer) && !(val instanceof Boolean)))
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throw new SocketException("Bad parameter for option");
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if (val instanceof Boolean) {
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/* true only if disabling - enabling should be Integer */
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on = false;
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}
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break;
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case SO_TIMEOUT:
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if (val == null || (!(val instanceof Integer)))
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throw new SocketException("Bad parameter for SO_TIMEOUT");
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int tmp = ((Integer) val).intValue();
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if (tmp < 0)
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throw new IllegalArgumentException("timeout < 0");
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timeout = tmp;
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break;
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case IP_TOS:
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if (val == null || !(val instanceof Integer)) {
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throw new SocketException("bad argument for IP_TOS");
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}
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trafficClass = ((Integer)val).intValue();
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break;
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case SO_BINDADDR:
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throw new SocketException("Cannot re-bind socket");
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case TCP_NODELAY:
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if (val == null || !(val instanceof Boolean))
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throw new SocketException("bad parameter for TCP_NODELAY");
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on = ((Boolean)val).booleanValue();
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break;
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case SO_SNDBUF:
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case SO_RCVBUF:
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if (val == null || !(val instanceof Integer) ||
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!(((Integer)val).intValue() > 0)) {
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throw new SocketException("bad parameter for SO_SNDBUF " +
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"or SO_RCVBUF");
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}
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break;
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case SO_KEEPALIVE:
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if (val == null || !(val instanceof Boolean))
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throw new SocketException("bad parameter for SO_KEEPALIVE");
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on = ((Boolean)val).booleanValue();
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break;
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case SO_OOBINLINE:
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if (val == null || !(val instanceof Boolean))
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throw new SocketException("bad parameter for SO_OOBINLINE");
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on = ((Boolean)val).booleanValue();
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break;
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case SO_REUSEADDR:
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if (val == null || !(val instanceof Boolean))
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throw new SocketException("bad parameter for SO_REUSEADDR");
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on = ((Boolean)val).booleanValue();
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break;
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default:
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throw new SocketException("unrecognized TCP option: " + opt);
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}
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socketSetOption(opt, on, val);
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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_TIMEOUT) {
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return new Integer(timeout);
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}
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int ret = 0;
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/*
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* The native socketGetOption() knows about 3 options.
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* The 32 bit value it returns will be interpreted according
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* to what we're asking. A return of -1 means it understands
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* the option but its turned off. It will raise a SocketException
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* if "opt" isn't one it understands.
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*/
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switch (opt) {
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case TCP_NODELAY:
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ret = socketGetOption(opt, null);
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return Boolean.valueOf(ret != -1);
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case SO_OOBINLINE:
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ret = socketGetOption(opt, null);
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return Boolean.valueOf(ret != -1);
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case SO_LINGER:
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ret = socketGetOption(opt, null);
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return (ret == -1) ? Boolean.FALSE: (Object)(new Integer(ret));
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case SO_REUSEADDR:
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ret = socketGetOption(opt, null);
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return Boolean.valueOf(ret != -1);
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case SO_BINDADDR:
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InetAddressContainer in = new InetAddressContainer();
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ret = socketGetOption(opt, in);
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return in.addr;
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case SO_SNDBUF:
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case SO_RCVBUF:
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ret = socketGetOption(opt, null);
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return new Integer(ret);
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case IP_TOS:
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ret = socketGetOption(opt, null);
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if (ret == -1) { // ipv6 tos
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return new Integer(trafficClass);
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} else {
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return new Integer(ret);
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}
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case SO_KEEPALIVE:
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ret = socketGetOption(opt, null);
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return Boolean.valueOf(ret != -1);
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// should never get here
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default:
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return null;
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}
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}
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/**
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* The workhorse of the connection operation. Tries several times to
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* establish a connection to the given <host, port>. If unsuccessful,
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* throws an IOException indicating what went wrong.
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*/
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synchronized void doConnect(InetAddress address, int port, int timeout) throws IOException {
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try {
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FileDescriptor fd = acquireFD();
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try {
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socketConnect(address, port, timeout);
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// If we have a ref. to the Socket, then sets the flags
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// created, bound & connected to true.
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// This is normally done in Socket.connect() but some
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// subclasses of Socket may call impl.connect() directly!
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if (socket != null) {
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socket.setBound();
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socket.setConnected();
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}
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} finally {
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releaseFD();
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}
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} catch (IOException e) {
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close();
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throw e;
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}
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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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socketBind(address, lport);
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if (socket != null)
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socket.setBound();
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if (serverSocket != null)
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serverSocket.setBound();
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}
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/**
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* Listens, for a specified amount of time, for connections.
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* @param count the amount of time to listen for connections
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*/
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protected synchronized void listen(int count) throws IOException {
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socketListen(count);
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}
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350 |
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/**
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* Accepts connections.
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* @param s the connection
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354 |
*/
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protected void accept(SocketImpl s) throws IOException {
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356 |
FileDescriptor fd = acquireFD();
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357 |
try {
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socketAccept(s);
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359 |
} finally {
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360 |
releaseFD();
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361 |
}
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362 |
}
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363 |
|
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364 |
/**
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365 |
* Gets an InputStream for this socket.
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366 |
*/
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367 |
protected synchronized InputStream getInputStream() throws IOException {
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|
368 |
if (isClosedOrPending()) {
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369 |
throw new IOException("Socket Closed");
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370 |
}
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371 |
if (shut_rd) {
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372 |
throw new IOException("Socket input is shutdown");
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373 |
}
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374 |
if (socketInputStream == null) {
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375 |
socketInputStream = new SocketInputStream(this);
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376 |
}
|
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377 |
return socketInputStream;
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|
378 |
}
|
|
379 |
|
|
380 |
void setInputStream(SocketInputStream in) {
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|
381 |
socketInputStream = in;
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382 |
}
|
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383 |
|
|
384 |
/**
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|
385 |
* Gets an OutputStream for this socket.
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|
386 |
*/
|
|
387 |
protected synchronized OutputStream getOutputStream() throws IOException {
|
|
388 |
if (isClosedOrPending()) {
|
|
389 |
throw new IOException("Socket Closed");
|
|
390 |
}
|
|
391 |
if (shut_wr) {
|
|
392 |
throw new IOException("Socket output is shutdown");
|
|
393 |
}
|
|
394 |
return new SocketOutputStream(this);
|
|
395 |
}
|
|
396 |
|
|
397 |
void setFileDescriptor(FileDescriptor fd) {
|
|
398 |
this.fd = fd;
|
|
399 |
}
|
|
400 |
|
|
401 |
void setAddress(InetAddress address) {
|
|
402 |
this.address = address;
|
|
403 |
}
|
|
404 |
|
|
405 |
void setPort(int port) {
|
|
406 |
this.port = port;
|
|
407 |
}
|
|
408 |
|
|
409 |
void setLocalPort(int localport) {
|
|
410 |
this.localport = localport;
|
|
411 |
}
|
|
412 |
|
|
413 |
/**
|
|
414 |
* Returns the number of bytes that can be read without blocking.
|
|
415 |
*/
|
|
416 |
protected synchronized int available() throws IOException {
|
|
417 |
if (isClosedOrPending()) {
|
|
418 |
throw new IOException("Stream closed.");
|
|
419 |
}
|
|
420 |
|
|
421 |
/*
|
|
422 |
* If connection has been reset then return 0 to indicate
|
|
423 |
* there are no buffered bytes.
|
|
424 |
*/
|
|
425 |
if (isConnectionReset()) {
|
|
426 |
return 0;
|
|
427 |
}
|
|
428 |
|
|
429 |
/*
|
|
430 |
* If no bytes available and we were previously notified
|
|
431 |
* of a connection reset then we move to the reset state.
|
|
432 |
*
|
|
433 |
* If are notified of a connection reset then check
|
|
434 |
* again if there are bytes buffered on the socket.
|
|
435 |
*/
|
|
436 |
int n = 0;
|
|
437 |
try {
|
|
438 |
n = socketAvailable();
|
|
439 |
if (n == 0 && isConnectionResetPending()) {
|
|
440 |
setConnectionReset();
|
|
441 |
}
|
|
442 |
} catch (ConnectionResetException exc1) {
|
|
443 |
setConnectionResetPending();
|
|
444 |
try {
|
|
445 |
n = socketAvailable();
|
|
446 |
if (n == 0) {
|
|
447 |
setConnectionReset();
|
|
448 |
}
|
|
449 |
} catch (ConnectionResetException exc2) {
|
|
450 |
}
|
|
451 |
}
|
|
452 |
return n;
|
|
453 |
}
|
|
454 |
|
|
455 |
/**
|
|
456 |
* Closes the socket.
|
|
457 |
*/
|
|
458 |
protected void close() throws IOException {
|
|
459 |
synchronized(fdLock) {
|
|
460 |
if (fd != null) {
|
|
461 |
if (fdUseCount == 0) {
|
|
462 |
if (closePending) {
|
|
463 |
return;
|
|
464 |
}
|
|
465 |
closePending = true;
|
|
466 |
/*
|
|
467 |
* We close the FileDescriptor in two-steps - first the
|
|
468 |
* "pre-close" which closes the socket but doesn't
|
|
469 |
* release the underlying file descriptor. This operation
|
|
470 |
* may be lengthy due to untransmitted data and a long
|
|
471 |
* linger interval. Once the pre-close is done we do the
|
|
472 |
* actual socket to release the fd.
|
|
473 |
*/
|
|
474 |
try {
|
|
475 |
socketPreClose();
|
|
476 |
} finally {
|
|
477 |
socketClose();
|
|
478 |
}
|
|
479 |
fd = null;
|
|
480 |
return;
|
|
481 |
} else {
|
|
482 |
/*
|
|
483 |
* If a thread has acquired the fd and a close
|
|
484 |
* isn't pending then use a deferred close.
|
|
485 |
* Also decrement fdUseCount to signal the last
|
|
486 |
* thread that releases the fd to close it.
|
|
487 |
*/
|
|
488 |
if (!closePending) {
|
|
489 |
closePending = true;
|
|
490 |
fdUseCount--;
|
|
491 |
socketPreClose();
|
|
492 |
}
|
|
493 |
}
|
|
494 |
}
|
|
495 |
}
|
|
496 |
}
|
|
497 |
|
|
498 |
void reset() throws IOException {
|
|
499 |
if (fd != null) {
|
|
500 |
socketClose();
|
|
501 |
}
|
|
502 |
fd = null;
|
|
503 |
super.reset();
|
|
504 |
}
|
|
505 |
|
|
506 |
|
|
507 |
/**
|
|
508 |
* Shutdown read-half of the socket connection;
|
|
509 |
*/
|
|
510 |
protected void shutdownInput() throws IOException {
|
|
511 |
if (fd != null) {
|
|
512 |
socketShutdown(SHUT_RD);
|
|
513 |
if (socketInputStream != null) {
|
|
514 |
socketInputStream.setEOF(true);
|
|
515 |
}
|
|
516 |
shut_rd = true;
|
|
517 |
}
|
|
518 |
}
|
|
519 |
|
|
520 |
/**
|
|
521 |
* Shutdown write-half of the socket connection;
|
|
522 |
*/
|
|
523 |
protected void shutdownOutput() throws IOException {
|
|
524 |
if (fd != null) {
|
|
525 |
socketShutdown(SHUT_WR);
|
|
526 |
shut_wr = true;
|
|
527 |
}
|
|
528 |
}
|
|
529 |
|
|
530 |
protected boolean supportsUrgentData () {
|
|
531 |
return true;
|
|
532 |
}
|
|
533 |
|
|
534 |
protected void sendUrgentData (int data) throws IOException {
|
|
535 |
if (fd == null) {
|
|
536 |
throw new IOException("Socket Closed");
|
|
537 |
}
|
|
538 |
socketSendUrgentData (data);
|
|
539 |
}
|
|
540 |
|
|
541 |
/**
|
|
542 |
* Cleans up if the user forgets to close it.
|
|
543 |
*/
|
|
544 |
protected void finalize() throws IOException {
|
|
545 |
close();
|
|
546 |
}
|
|
547 |
|
|
548 |
|
|
549 |
/*
|
|
550 |
* "Acquires" and returns the FileDescriptor for this impl
|
|
551 |
*
|
|
552 |
* A corresponding releaseFD is required to "release" the
|
|
553 |
* FileDescriptor.
|
|
554 |
*/
|
|
555 |
FileDescriptor acquireFD() {
|
|
556 |
synchronized (fdLock) {
|
|
557 |
fdUseCount++;
|
|
558 |
return fd;
|
|
559 |
}
|
|
560 |
}
|
|
561 |
|
|
562 |
/*
|
|
563 |
* "Release" the FileDescriptor for this impl.
|
|
564 |
*
|
|
565 |
* If the use count goes to -1 then the socket is closed.
|
|
566 |
*/
|
|
567 |
void releaseFD() {
|
|
568 |
synchronized (fdLock) {
|
|
569 |
fdUseCount--;
|
|
570 |
if (fdUseCount == -1) {
|
|
571 |
if (fd != null) {
|
|
572 |
try {
|
|
573 |
socketClose();
|
|
574 |
} catch (IOException e) {
|
|
575 |
} finally {
|
|
576 |
fd = null;
|
|
577 |
}
|
|
578 |
}
|
|
579 |
}
|
|
580 |
}
|
|
581 |
}
|
|
582 |
|
|
583 |
public boolean isConnectionReset() {
|
|
584 |
synchronized (resetLock) {
|
|
585 |
return (resetState == CONNECTION_RESET);
|
|
586 |
}
|
|
587 |
}
|
|
588 |
|
|
589 |
public boolean isConnectionResetPending() {
|
|
590 |
synchronized (resetLock) {
|
|
591 |
return (resetState == CONNECTION_RESET_PENDING);
|
|
592 |
}
|
|
593 |
}
|
|
594 |
|
|
595 |
public void setConnectionReset() {
|
|
596 |
synchronized (resetLock) {
|
|
597 |
resetState = CONNECTION_RESET;
|
|
598 |
}
|
|
599 |
}
|
|
600 |
|
|
601 |
public void setConnectionResetPending() {
|
|
602 |
synchronized (resetLock) {
|
|
603 |
if (resetState == CONNECTION_NOT_RESET) {
|
|
604 |
resetState = CONNECTION_RESET_PENDING;
|
|
605 |
}
|
|
606 |
}
|
|
607 |
|
|
608 |
}
|
|
609 |
|
|
610 |
/*
|
|
611 |
* Return true if already closed or close is pending
|
|
612 |
*/
|
|
613 |
public boolean isClosedOrPending() {
|
|
614 |
/*
|
|
615 |
* Lock on fdLock to ensure that we wait if a
|
|
616 |
* close is in progress.
|
|
617 |
*/
|
|
618 |
synchronized (fdLock) {
|
|
619 |
if (closePending || (fd == null)) {
|
|
620 |
return true;
|
|
621 |
} else {
|
|
622 |
return false;
|
|
623 |
}
|
|
624 |
}
|
|
625 |
}
|
|
626 |
|
|
627 |
/*
|
|
628 |
* Return the current value of SO_TIMEOUT
|
|
629 |
*/
|
|
630 |
public int getTimeout() {
|
|
631 |
return timeout;
|
|
632 |
}
|
|
633 |
|
|
634 |
/*
|
|
635 |
* "Pre-close" a socket by dup'ing the file descriptor - this enables
|
|
636 |
* the socket to be closed without releasing the file descriptor.
|
|
637 |
*/
|
|
638 |
private void socketPreClose() throws IOException {
|
|
639 |
socketClose0(true);
|
|
640 |
}
|
|
641 |
|
|
642 |
/*
|
|
643 |
* Close the socket (and release the file descriptor).
|
|
644 |
*/
|
|
645 |
protected void socketClose() throws IOException {
|
|
646 |
socketClose0(false);
|
|
647 |
}
|
|
648 |
|
|
649 |
abstract void socketCreate(boolean isServer) throws IOException;
|
|
650 |
abstract void socketConnect(InetAddress address, int port, int timeout)
|
|
651 |
throws IOException;
|
|
652 |
abstract void socketBind(InetAddress address, int port)
|
|
653 |
throws IOException;
|
|
654 |
abstract void socketListen(int count)
|
|
655 |
throws IOException;
|
|
656 |
abstract void socketAccept(SocketImpl s)
|
|
657 |
throws IOException;
|
|
658 |
abstract int socketAvailable()
|
|
659 |
throws IOException;
|
|
660 |
abstract void socketClose0(boolean useDeferredClose)
|
|
661 |
throws IOException;
|
|
662 |
abstract void socketShutdown(int howto)
|
|
663 |
throws IOException;
|
|
664 |
abstract void socketSetOption(int cmd, boolean on, Object value)
|
|
665 |
throws SocketException;
|
|
666 |
abstract int socketGetOption(int opt, Object iaContainerObj) throws SocketException;
|
|
667 |
abstract void socketSendUrgentData(int data)
|
|
668 |
throws IOException;
|
|
669 |
|
|
670 |
public final static int SHUT_RD = 0;
|
|
671 |
public final static int SHUT_WR = 1;
|
|
672 |
}
|
|
673 |
|
|
674 |
class InetAddressContainer {
|
|
675 |
InetAddress addr;
|
|
676 |
}
|