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 }