1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * Copyright (c) 1995, 2007, Oracle and/or its affiliates. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. Oracle designates this 9 * particular file as subject to the "Classpath" exception as provided 10 * by Oracle in the LICENSE file that accompanied this code. 11 * 12 * This code is distributed in the hope that it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 * version 2 for more details (a copy is included in the LICENSE file that 16 * accompanied this code). 17 * 18 * You should have received a copy of the GNU General Public License version 19 * 2 along with this work; if not, write to the Free Software Foundation, 20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 21 * 22 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 23 * or visit www.oracle.com if you need additional information or have any 24 * questions. 25 */ 26 27 package java.net; 28 29 import java.io.FileDescriptor; 30 import java.io.FileOutputStream; 31 import java.io.IOException; 32 import java.nio.channels.FileChannel; 33 34 import dalvik.system.BlockGuard; 35 import sun.misc.IoTrace; 36 37 /** 38 * This stream extends FileOutputStream to implement a 39 * SocketOutputStream. Note that this class should <b>NOT</b> be 40 * public. 41 * 42 * @author Jonathan Payne 43 * @author Arthur van Hoff 44 */ 45 class SocketOutputStream extends FileOutputStream 46 { 47 private AbstractPlainSocketImpl impl = null; 48 private byte temp[] = new byte[1]; 49 private Socket socket = null; 50 51 /** 52 * Creates a new SocketOutputStream. Can only be called 53 * by a Socket. This method needs to hang on to the owner Socket so 54 * that the fd will not be closed. 55 * @param impl the socket output stream inplemented 56 */ 57 SocketOutputStream(AbstractPlainSocketImpl impl) throws IOException { 58 super(impl.getFileDescriptor()); 59 this.impl = impl; 60 socket = impl.getSocket(); 61 } 62 63 /** 64 * Returns the unique {@link java.nio.channels.FileChannel FileChannel} 65 * object associated with this file output stream. </p> 66 * 67 * The <code>getChannel</code> method of <code>SocketOutputStream</code> 68 * returns <code>null</code> since it is a socket based stream.</p> 69 * 70 * @return the file channel associated with this file output stream 71 * 72 * @since 1.4 73 * @spec JSR-51 74 */ 75 public final FileChannel getChannel() { 76 return null; 77 } 78 79 /** 80 * Writes to the socket. 81 * @param fd the FileDescriptor 82 * @param b the data to be written 83 * @param off the start offset in the data 84 * @param len the number of bytes that are written 85 * @exception IOException If an I/O error has occurred. 86 */ 87 private native void socketWrite0(FileDescriptor fd, byte[] b, int off, 88 int len) throws IOException; 89 90 /** 91 * Writes to the socket with appropriate locking of the 92 * FileDescriptor. 93 * @param b the data to be written 94 * @param off the start offset in the data 95 * @param len the number of bytes that are written 96 * @exception IOException If an I/O error has occurred. 97 */ 98 private void socketWrite(byte b[], int off, int len) throws IOException { 99 100 if (len <= 0 || off < 0 || off + len > b.length) { 101 if (len == 0) { 102 return; 103 } 104 throw new ArrayIndexOutOfBoundsException(); 105 } 106 107 Object traceContext = IoTrace.socketWriteBegin(); 108 int bytesWritten = 0; 109 FileDescriptor fd = impl.acquireFD(); 110 try { 111 BlockGuard.getThreadPolicy().onNetwork(); 112 socketWrite0(fd, b, off, len); 113 bytesWritten = len; 114 } catch (SocketException se) { 115 if (se instanceof sun.net.ConnectionResetException) { 116 impl.setConnectionResetPending(); 117 se = new SocketException("Connection reset"); 118 } 119 if (impl.isClosedOrPending()) { 120 throw new SocketException("Socket closed"); 121 } else { 122 throw se; 123 } 124 } finally { 125 IoTrace.socketWriteEnd(traceContext, impl.address, impl.port, bytesWritten); 126 } 127 } 128 129 /** 130 * Writes a byte to the socket. 131 * @param b the data to be written 132 * @exception IOException If an I/O error has occurred. 133 */ 134 public void write(int b) throws IOException { 135 temp[0] = (byte)b; 136 socketWrite(temp, 0, 1); 137 } 138 139 /** 140 * Writes the contents of the buffer <i>b</i> to the socket. 141 * @param b the data to be written 142 * @exception SocketException If an I/O error has occurred. 143 */ 144 public void write(byte b[]) throws IOException { 145 socketWrite(b, 0, b.length); 146 } 147 148 /** 149 * Writes <i>length</i> bytes from buffer <i>b</i> starting at 150 * offset <i>len</i>. 151 * @param b the data to be written 152 * @param off the start offset in the data 153 * @param len the number of bytes that are written 154 * @exception SocketException If an I/O error has occurred. 155 */ 156 public void write(byte b[], int off, int len) throws IOException { 157 socketWrite(b, off, len); 158 } 159 160 /** 161 * Closes the stream. 162 */ 163 private boolean closing = false; 164 public void close() throws IOException { 165 // Prevent recursion. See BugId 4484411 166 if (closing) 167 return; 168 closing = true; 169 if (socket != null) { 170 if (!socket.isClosed()) 171 socket.close(); 172 } else 173 impl.close(); 174 closing = false; 175 } 176 177 /** 178 * Overrides finalize, the fd is closed by the Socket. 179 */ 180 protected void finalize() {} 181 } 182
