1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * Copyright (c) 1995, 2016, 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 36 /** 37 * This stream extends FileOutputStream to implement a 38 * SocketOutputStream. Note that this class should <b>NOT</b> be 39 * public. 40 * 41 * @author Jonathan Payne 42 * @author Arthur van Hoff 43 */ 44 class SocketOutputStream extends FileOutputStream 45 { 46 private AbstractPlainSocketImpl impl = null; 47 private byte temp[] = new byte[1]; 48 private Socket socket = null; 49 50 /** 51 * Creates a new SocketOutputStream. Can only be called 52 * by a Socket. This method needs to hang on to the owner Socket so 53 * that the fd will not be closed. 54 * @param impl the socket output stream inplemented 55 */ 56 SocketOutputStream(AbstractPlainSocketImpl impl) throws IOException { 57 super(impl.getFileDescriptor()); 58 this.impl = impl; 59 socket = impl.getSocket(); 60 } 61 62 /** 63 * Returns the unique {@link java.nio.channels.FileChannel FileChannel} 64 * object associated with this file output stream. </p> 65 * 66 * The {@code getChannel} method of {@code SocketOutputStream} 67 * returns {@code null} since it is a socket based stream.</p> 68 * 69 * @return the file channel associated with this file output stream 70 * 71 * @since 1.4 72 * @spec JSR-51 73 */ 74 public final FileChannel getChannel() { 75 return null; 76 } 77 78 /** 79 * Writes to the socket. 80 * @param fd the FileDescriptor 81 * @param b the data to be written 82 * @param off the start offset in the data 83 * @param len the number of bytes that are written 84 * @exception IOException If an I/O error has occurred. 85 */ 86 private native void socketWrite0(FileDescriptor fd, byte[] b, int off, 87 int len) throws IOException; 88 89 /** 90 * Writes to the socket with appropriate locking of the 91 * FileDescriptor. 92 * @param b the data to be written 93 * @param off the start offset in the data 94 * @param len the number of bytes that are written 95 * @exception IOException If an I/O error has occurred. 96 */ 97 private void socketWrite(byte b[], int off, int len) throws IOException { 98 if (len <= 0 || off < 0 || len > b.length - off) { 99 if (len == 0) { 100 return; 101 } 102 throw new ArrayIndexOutOfBoundsException("len == " + len 103 + " off == " + off + " buffer length == " + b.length); 104 } 105 106 FileDescriptor fd = impl.acquireFD(); 107 try { 108 BlockGuard.getThreadPolicy().onNetwork(); 109 socketWrite0(fd, b, off, len); 110 } catch (SocketException se) { 111 if (se instanceof sun.net.ConnectionResetException) { 112 impl.setConnectionResetPending(); 113 se = new SocketException("Connection reset"); 114 } 115 if (impl.isClosedOrPending()) { 116 throw new SocketException("Socket closed"); 117 } else { 118 throw se; 119 } 120 } finally { 121 impl.releaseFD(); 122 } 123 } 124 125 /** 126 * Writes a byte to the socket. 127 * @param b the data to be written 128 * @exception IOException If an I/O error has occurred. 129 */ 130 public void write(int b) throws IOException { 131 temp[0] = (byte)b; 132 socketWrite(temp, 0, 1); 133 } 134 135 /** 136 * Writes the contents of the buffer <i>b</i> to the socket. 137 * @param b the data to be written 138 * @exception SocketException If an I/O error has occurred. 139 */ 140 public void write(byte b[]) throws IOException { 141 socketWrite(b, 0, b.length); 142 } 143 144 /** 145 * Writes <i>length</i> bytes from buffer <i>b</i> starting at 146 * offset <i>len</i>. 147 * @param b the data to be written 148 * @param off the start offset in the data 149 * @param len the number of bytes that are written 150 * @exception SocketException If an I/O error has occurred. 151 */ 152 public void write(byte b[], int off, int len) throws IOException { 153 socketWrite(b, off, len); 154 } 155 156 /** 157 * Closes the stream. 158 */ 159 private boolean closing = false; 160 public void close() throws IOException { 161 // Prevent recursion. See BugId 4484411 162 if (closing) 163 return; 164 closing = true; 165 if (socket != null) { 166 if (!socket.isClosed()) 167 socket.close(); 168 } else 169 impl.close(); 170 closing = false; 171 } 172 173 /** 174 * Overrides finalize, the fd is closed by the Socket. 175 */ 176 protected void finalize() {} 177 } 178
