1 /* 2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package sun.nio.ch; 27 28 import dalvik.system.BlockGuard; 29 import dalvik.system.SocketTagger; 30 31 import java.io.*; 32 import java.net.SocketException; 33 34 class FileDispatcherImpl extends FileDispatcher { 35 36 FileDispatcherImpl(boolean append) { 37 /* append is ignored */ 38 } 39 40 FileDispatcherImpl() { 41 } 42 43 int read(FileDescriptor fd, long address, int len) throws IOException { 44 BlockGuard.getThreadPolicy().onReadFromDisk(); 45 return read0(fd, address, len); 46 } 47 48 int pread(FileDescriptor fd, long address, int len, long position) 49 throws IOException 50 { 51 BlockGuard.getThreadPolicy().onReadFromDisk(); 52 return pread0(fd, address, len, position); 53 } 54 55 long readv(FileDescriptor fd, long address, int len) throws IOException { 56 BlockGuard.getThreadPolicy().onReadFromDisk(); 57 return readv0(fd, address, len); 58 } 59 60 int write(FileDescriptor fd, long address, int len) throws IOException { 61 BlockGuard.getThreadPolicy().onWriteToDisk(); 62 return write0(fd, address, len); 63 } 64 65 int pwrite(FileDescriptor fd, long address, int len, long position) 66 throws IOException 67 { 68 BlockGuard.getThreadPolicy().onWriteToDisk(); 69 return pwrite0(fd, address, len, position); 70 } 71 72 long writev(FileDescriptor fd, long address, int len) 73 throws IOException 74 { 75 BlockGuard.getThreadPolicy().onWriteToDisk(); 76 return writev0(fd, address, len); 77 } 78 79 int force(FileDescriptor fd, boolean metaData) throws IOException { 80 BlockGuard.getThreadPolicy().onWriteToDisk(); 81 return force0(fd, metaData); 82 } 83 84 int truncate(FileDescriptor fd, long size) throws IOException { 85 BlockGuard.getThreadPolicy().onWriteToDisk(); 86 return truncate0(fd, size); 87 } 88 89 long size(FileDescriptor fd) throws IOException { 90 BlockGuard.getThreadPolicy().onReadFromDisk(); 91 return size0(fd); 92 } 93 94 int lock(FileDescriptor fd, boolean blocking, long pos, long size, 95 boolean shared) throws IOException 96 { 97 BlockGuard.getThreadPolicy().onWriteToDisk(); 98 return lock0(fd, blocking, pos, size, shared); 99 } 100 101 void release(FileDescriptor fd, long pos, long size) throws IOException { 102 BlockGuard.getThreadPolicy().onWriteToDisk(); 103 release0(fd, pos, size); 104 } 105 106 void close(FileDescriptor fd) throws IOException { 107 close0(fd); 108 } 109 110 void preClose(FileDescriptor fd) throws IOException { 111 preCloseImpl(fd); 112 } 113 114 static void preCloseImpl(FileDescriptor fd) throws IOException { 115 if (fd.isSocket$()) { 116 // Always untag sockets before the preClose. The file descriptor will describe 117 // a different file (/dev/null) after preClose0. 118 try { 119 SocketTagger.get().untag(fd); 120 } catch (SocketException ignored) { 121 } 122 } 123 124 preClose0(fd); 125 } 126 127 FileDescriptor duplicateForMapping(FileDescriptor fd) { 128 // file descriptor not required for mapping operations; okay 129 // to return invalid file descriptor. 130 return new FileDescriptor(); 131 } 132 133 boolean canTransferToDirectly(java.nio.channels.SelectableChannel sc) { 134 return true; 135 } 136 137 boolean transferToDirectlyNeedsPositionLock() { 138 return false; 139 } 140 141 // -- Native methods -- 142 143 static native int read0(FileDescriptor fd, long address, int len) 144 throws IOException; 145 146 static native int pread0(FileDescriptor fd, long address, int len, 147 long position) throws IOException; 148 149 static native long readv0(FileDescriptor fd, long address, int len) 150 throws IOException; 151 152 static native int write0(FileDescriptor fd, long address, int len) 153 throws IOException; 154 155 static native int pwrite0(FileDescriptor fd, long address, int len, 156 long position) throws IOException; 157 158 static native long writev0(FileDescriptor fd, long address, int len) 159 throws IOException; 160 161 static native int force0(FileDescriptor fd, boolean metaData) 162 throws IOException; 163 164 static native int truncate0(FileDescriptor fd, long size) 165 throws IOException; 166 167 static native long size0(FileDescriptor fd) throws IOException; 168 169 static native int lock0(FileDescriptor fd, boolean blocking, long pos, 170 long size, boolean shared) throws IOException; 171 172 static native void release0(FileDescriptor fd, long pos, long size) 173 throws IOException; 174 175 static native void close0(FileDescriptor fd) throws IOException; 176 177 private static native void preClose0(FileDescriptor fd) throws IOException; 178 179 static native void closeIntFD(int fd) throws IOException; 180 181 } 182
