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 // Android-removed: Android doesn't need to call native init. 47 // static { 48 // init(); 49 //} 50 51 private AbstractPlainSocketImpl impl = null; 52 private byte temp[] = new byte[1]; 53 private Socket socket = null; 54 55 /** 56 * Creates a new SocketOutputStream. Can only be called 57 * by a Socket. This method needs to hang on to the owner Socket so 58 * that the fd will not be closed. 59 * @param impl the socket output stream inplemented 60 */ 61 SocketOutputStream(AbstractPlainSocketImpl impl) throws IOException { 62 super(impl.getFileDescriptor()); 63 this.impl = impl; 64 socket = impl.getSocket(); 65 } 66 67 /** 68 * Returns the unique {@link java.nio.channels.FileChannel FileChannel} 69 * object associated with this file output stream. </p> 70 * 71 * The {@code getChannel} method of {@code SocketOutputStream} 72 * returns {@code null} since it is a socket based stream.</p> 73 * 74 * @return the file channel associated with this file output stream 75 * 76 * @since 1.4 77 * @spec JSR-51 78 */ 79 public final FileChannel getChannel() { 80 return null; 81 } 82 83 /** 84 * Writes to the socket. 85 * @param fd the FileDescriptor 86 * @param b the data to be written 87 * @param off the start offset in the data 88 * @param len the number of bytes that are written 89 * @exception IOException If an I/O error has occurred. 90 */ 91 private native void socketWrite0(FileDescriptor fd, byte[] b, int off, 92 int len) throws IOException; 93 94 /** 95 * Writes to the socket with appropriate locking of the 96 * FileDescriptor. 97 * @param b the data to be written 98 * @param off the start offset in the data 99 * @param len the number of bytes that are written 100 * @exception IOException If an I/O error has occurred. 101 */ 102 private void socketWrite(byte b[], int off, int len) throws IOException { 103 104 105 if (len <= 0 || off < 0 || len > b.length - off) { 106 if (len == 0) { 107 return; 108 } 109 throw new ArrayIndexOutOfBoundsException("len == " + len 110 + " off == " + off + " buffer length == " + b.length); 111 } 112 113 FileDescriptor fd = impl.acquireFD(); 114 try { 115 // Android-added: Check BlockGuard policy in socketWrite. 116 BlockGuard.getThreadPolicy().onNetwork(); 117 socketWrite0(fd, b, off, len); 118 } catch (SocketException se) { 119 if (se instanceof sun.net.ConnectionResetException) { 120 impl.setConnectionResetPending(); 121 se = new SocketException("Connection reset"); 122 } 123 if (impl.isClosedOrPending()) { 124 throw new SocketException("Socket closed"); 125 } else { 126 throw se; 127 } 128 } finally { 129 impl.releaseFD(); 130 } 131 } 132 133 /** 134 * Writes a byte to the socket. 135 * @param b the data to be written 136 * @exception IOException If an I/O error has occurred. 137 */ 138 public void write(int b) throws IOException { 139 temp[0] = (byte)b; 140 socketWrite(temp, 0, 1); 141 } 142 143 /** 144 * Writes the contents of the buffer <i>b</i> to the socket. 145 * @param b the data to be written 146 * @exception SocketException If an I/O error has occurred. 147 */ 148 public void write(byte b[]) throws IOException { 149 socketWrite(b, 0, b.length); 150 } 151 152 /** 153 * Writes <i>length</i> bytes from buffer <i>b</i> starting at 154 * offset <i>len</i>. 155 * @param b the data to be written 156 * @param off the start offset in the data 157 * @param len the number of bytes that are written 158 * @exception SocketException If an I/O error has occurred. 159 */ 160 public void write(byte b[], int off, int len) throws IOException { 161 socketWrite(b, off, len); 162 } 163 164 /** 165 * Closes the stream. 166 */ 167 private boolean closing = false; 168 public void close() throws IOException { 169 // Prevent recursion. See BugId 4484411 170 if (closing) 171 return; 172 closing = true; 173 if (socket != null) { 174 if (!socket.isClosed()) 175 socket.close(); 176 } else 177 impl.close(); 178 closing = false; 179 } 180 181 /** 182 * Overrides finalize, the fd is closed by the Socket. 183 */ 184 protected void finalize() {} 185 186 // Android-removed: Android doesn't need native init. 187 /* 188 * Perform class load-time initializations. 189 * 190 private native static void init(); 191 */ 192 } 193
