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 import jdk.internal.access.SharedSecrets;
31 import jdk.internal.access.JavaIOFileDescriptorAccess;
32 import sun.security.action.GetPropertyAction;
33 import java.io.File;
34 import java.nio.CharBuffer;
35
36 class FileDispatcherImpl extends FileDispatcher {
37
38 private static final JavaIOFileDescriptorAccess fdAccess =
39 SharedSecrets.getJavaIOFileDescriptorAccess();
40
41 // set to true if fast file transmission (TransmitFile) is enabled
42 private static final boolean fastFileTransfer;
43
44 FileDispatcherImpl() { }
45
46 @Override
47 boolean needsPositionLock() {
48 return true;
49 }
50
51 int read(FileDescriptor fd, long address, int len)
52 throws IOException
53 {
54 return read0(fd, address, len);
55 }
56
57 int pread(FileDescriptor fd, long address, int len, long position)
58 throws IOException
59 {
60 return pread0(fd, address, len, position);
61 }
62
63 long readv(FileDescriptor fd, long address, int len) throws IOException {
64 return readv0(fd, address, len);
65 }
66
67 int write(FileDescriptor fd, long address, int len) throws IOException {
68 return write0(fd, address, len, fdAccess.getAppend(fd));
69 }
70
71 int pwrite(FileDescriptor fd, long address, int len, long position)
72 throws IOException
73 {
74 return pwrite0(fd, address, len, position);
75 }
76
77 long writev(FileDescriptor fd, long address, int len) throws IOException {
78 return writev0(fd, address, len, fdAccess.getAppend(fd));
79 }
80
81 long seek(FileDescriptor fd, long offset) throws IOException {
82 return seek0(fd, offset);
83 }
84
85 int force(FileDescriptor fd, boolean metaData) throws IOException {
86 return force0(fd, metaData);
87 }
88
89 int truncate(FileDescriptor fd, long size) throws IOException {
90 return truncate0(fd, size);
91 }
92
93 long size(FileDescriptor fd) throws IOException {
94 return size0(fd);
95 }
96
97 int lock(FileDescriptor fd, boolean blocking, long pos, long size,
98 boolean shared) throws IOException
99 {
100 return lock0(fd, blocking, pos, size, shared);
101 }
102
103 void release(FileDescriptor fd, long pos, long size) throws IOException {
104 release0(fd, pos, size);
105 }
106
107 void close(FileDescriptor fd) throws IOException {
108 fdAccess.close(fd);
109 }
110
111 FileDescriptor duplicateForMapping(FileDescriptor fd) throws IOException {
112 // on Windows we need to keep a handle to the file
113 FileDescriptor result = new FileDescriptor();
114 long handle = duplicateHandle(fdAccess.getHandle(fd));
115 fdAccess.setHandle(result, handle);
116 fdAccess.registerCleanup(result);
117 return result;
118 }
119
120 boolean canTransferToDirectly(java.nio.channels.SelectableChannel sc) {
121 return fastFileTransfer && sc.isBlocking();
122 }
123
124 boolean transferToDirectlyNeedsPositionLock() {
125 return true;
126 }
127
128 int setDirectIO(FileDescriptor fd, String path) {
129 int result = -1;
130 String filePath = path.substring(0, path.lastIndexOf(File.separator));
131 CharBuffer buffer = CharBuffer.allocate(filePath.length());
132 buffer.put(filePath);
133 try {
134 result = setDirect0(fd, buffer);
135 } catch (IOException e) {
136 throw new UnsupportedOperationException
137 ("Error setting up DirectIO", e);
138 }
139 return result;
140 }
141
142 static boolean isFastFileTransferRequested() {
143 String fileTransferProp = GetPropertyAction
144 .privilegedGetProperty("jdk.nio.enableFastFileTransfer", "false");
145 return fileTransferProp.isEmpty() ? true : Boolean.parseBoolean(fileTransferProp);
146 }
147
148 static {
149 IOUtil.load();
150 fastFileTransfer = isFastFileTransferRequested();
151 }
152
153 //-- Native methods
154
155 static native int read0(FileDescriptor fd, long address, int len)
156 throws IOException;
157
158 static native int pread0(FileDescriptor fd, long address, int len,
159 long position) throws IOException;
160
161 static native long readv0(FileDescriptor fd, long address, int len)
162 throws IOException;
163
164 static native int write0(FileDescriptor fd, long address, int len, boolean append)
165 throws IOException;
166
167 static native int pwrite0(FileDescriptor fd, long address, int len,
168 long position) throws IOException;
169
170 static native long writev0(FileDescriptor fd, long address, int len, boolean append)
171 throws IOException;
172
173 static native long seek0(FileDescriptor fd, long offset) throws IOException;
174
175 static native int force0(FileDescriptor fd, boolean metaData)
176 throws IOException;
177
178 static native int truncate0(FileDescriptor fd, long size)
179 throws IOException;
180
181 static native long size0(FileDescriptor fd) throws IOException;
182
183 static native int lock0(FileDescriptor fd, boolean blocking, long pos,
184 long size, boolean shared) throws IOException;
185
186 static native void release0(FileDescriptor fd, long pos, long size)
187 throws IOException;
188
189 static native void close0(FileDescriptor fd) throws IOException;
190
191 static native long duplicateHandle(long fd) throws IOException;
192
193 static native int setDirect0(FileDescriptor fd, CharBuffer buffer) throws IOException;
194 }