1 /* 2 * Copyright (c) 2000, 2018, 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 java.io.FileDescriptor; 29 import java.io.IOException; 30 31 import jdk.internal.access.JavaIOFileDescriptorAccess; 32 import jdk.internal.access.SharedSecrets; 33 34 class FileDispatcherImpl extends FileDispatcher { 35 36 static { 37 IOUtil.load(); 38 init(); 39 } 40 41 private static final JavaIOFileDescriptorAccess fdAccess = 42 SharedSecrets.getJavaIOFileDescriptorAccess(); 43 44 FileDispatcherImpl() { 45 } 46 47 int read(FileDescriptor fd, long address, int len) throws IOException { 48 return read0(fd, address, len); 49 } 50 51 int pread(FileDescriptor fd, long address, int len, long position) 52 throws IOException 53 { 54 return pread0(fd, address, len, position); 55 } 56 57 long readv(FileDescriptor fd, long address, int len) throws IOException { 58 return readv0(fd, address, len); 59 } 60 61 int write(FileDescriptor fd, long address, int len) throws IOException { 62 return write0(fd, address, len); 63 } 64 65 int pwrite(FileDescriptor fd, long address, int len, long position) 66 throws IOException 67 { 68 return pwrite0(fd, address, len, position); 69 } 70 71 long writev(FileDescriptor fd, long address, int len) 72 throws IOException 73 { 74 return writev0(fd, address, len); 75 } 76 77 long seek(FileDescriptor fd, long offset) throws IOException { 78 return seek0(fd, offset); 79 } 80 81 int force(FileDescriptor fd, boolean metaData) throws IOException { 82 return force0(fd, metaData); 83 } 84 85 int truncate(FileDescriptor fd, long size) throws IOException { 86 return truncate0(fd, size); 87 } 88 89 long size(FileDescriptor fd) throws IOException { 90 return size0(fd); 91 } 92 93 int lock(FileDescriptor fd, boolean blocking, long pos, long size, 94 boolean shared) throws IOException 95 { 96 return lock0(fd, blocking, pos, size, shared); 97 } 98 99 void release(FileDescriptor fd, long pos, long size) throws IOException { 100 release0(fd, pos, size); 101 } 102 103 void close(FileDescriptor fd) throws IOException { 104 fdAccess.close(fd); 105 } 106 107 void preClose(FileDescriptor fd) throws IOException { 108 preClose0(fd); 109 } 110 111 FileDescriptor duplicateForMapping(FileDescriptor fd) { 112 // file descriptor not required for mapping operations; okay 113 // to return invalid file descriptor. 114 return new FileDescriptor(); 115 } 116 117 boolean canTransferToDirectly(java.nio.channels.SelectableChannel sc) { 118 return true; 119 } 120 121 boolean transferToDirectlyNeedsPositionLock() { 122 return false; 123 } 124 125 int setDirectIO(FileDescriptor fd, String path) { 126 int result = -1; 127 try { 128 result = setDirect0(fd); 129 } catch (IOException e) { 130 throw new UnsupportedOperationException 131 ("Error setting up DirectIO", e); 132 } 133 return result; 134 } 135 136 // -- Native methods -- 137 138 static native int read0(FileDescriptor fd, long address, int len) 139 throws IOException; 140 141 static native int pread0(FileDescriptor fd, long address, int len, 142 long position) throws IOException; 143 144 static native long readv0(FileDescriptor fd, long address, int len) 145 throws IOException; 146 147 static native int write0(FileDescriptor fd, long address, int len) 148 throws IOException; 149 150 static native int pwrite0(FileDescriptor fd, long address, int len, 151 long position) throws IOException; 152 153 static native long writev0(FileDescriptor fd, long address, int len) 154 throws IOException; 155 156 static native int force0(FileDescriptor fd, boolean metaData) 157 throws IOException; 158 159 static native long seek0(FileDescriptor fd, long offset) 160 throws IOException; 161 162 static native int truncate0(FileDescriptor fd, long size) 163 throws IOException; 164 165 static native long size0(FileDescriptor fd) throws IOException; 166 167 static native int lock0(FileDescriptor fd, boolean blocking, long pos, 168 long size, boolean shared) throws IOException; 169 170 static native void release0(FileDescriptor fd, long pos, long size) 171 throws IOException; 172 173 // Shared with SocketDispatcher and DatagramDispatcher but 174 // NOT used by FileDispatcherImpl 175 static native void close0(FileDescriptor fd) throws IOException; 176 177 static native void preClose0(FileDescriptor fd) throws IOException; 178 179 static native void closeIntFD(int fd) throws IOException; 180 181 static native int setDirect0(FileDescriptor fd) throws IOException; 182 183 static native void init(); 184 185 }