author | alanb |
Sun, 15 Feb 2009 12:25:54 +0000 | |
changeset 2057 | 3acf8e5e2ca0 |
child 3065 | 452aaa2899fc |
permissions | -rw-r--r-- |
2057
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/* |
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* Copyright 2008-2009 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Sun designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Sun in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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package sun.nio.fs; |
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|
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import java.nio.file.*; |
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import java.nio.channels.*; |
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import java.io.FileDescriptor; |
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import java.util.Set; |
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|
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import sun.nio.ch.FileChannelImpl; |
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import sun.nio.ch.ThreadPool; |
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import sun.nio.ch.SimpleAsynchronousFileChannelImpl; |
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import sun.misc.SharedSecrets; |
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import sun.misc.JavaIOFileDescriptorAccess; |
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import com.sun.nio.file.ExtendedOpenOption; |
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import static sun.nio.fs.UnixNativeDispatcher.*; |
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import static sun.nio.fs.UnixConstants.*; |
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|
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/** |
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* Factory for FileChannels and AsynchronousFileChannels |
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*/ |
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|
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class UnixChannelFactory { |
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private static final JavaIOFileDescriptorAccess fdAccess = |
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SharedSecrets.getJavaIOFileDescriptorAccess(); |
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|
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private UnixChannelFactory() { |
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} |
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/** |
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* Represents the flags from a user-supplied set of open options. |
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*/ |
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private static class Flags { |
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boolean read; |
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boolean write; |
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boolean append; |
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boolean truncateExisting; |
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boolean noFollowLinks; |
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boolean create; |
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boolean createNew; |
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boolean deleteOnClose; |
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boolean sync; |
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boolean dsync; |
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|
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static Flags toFlags(Set<? extends OpenOption> options) { |
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Flags flags = new Flags(); |
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for (OpenOption option: options) { |
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if (option instanceof StandardOpenOption) { |
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switch ((StandardOpenOption)option) { |
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case READ : flags.read = true; break; |
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case WRITE : flags.write = true; break; |
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case APPEND : flags.append = true; break; |
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case TRUNCATE_EXISTING : flags.truncateExisting = true; break; |
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case CREATE : flags.create = true; break; |
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case CREATE_NEW : flags.createNew = true; break; |
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case DELETE_ON_CLOSE : flags.deleteOnClose = true; break; |
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case SPARSE : /* ignore */ break; |
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case SYNC : flags.sync = true; break; |
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case DSYNC : flags.dsync = true; break; |
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default: throw new UnsupportedOperationException(); |
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} |
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continue; |
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} |
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if (option == LinkOption.NOFOLLOW_LINKS) { |
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flags.noFollowLinks = true; |
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continue; |
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} |
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if (option == null) |
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throw new NullPointerException(); |
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throw new UnsupportedOperationException(); |
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} |
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return flags; |
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} |
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} |
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|
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|
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/** |
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* Constructs a file channel from an existing (open) file descriptor |
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*/ |
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static FileChannel newFileChannel(int fd, boolean reading, boolean writing) { |
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FileDescriptor fdObj = new FileDescriptor(); |
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fdAccess.set(fdObj, fd); |
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return FileChannelImpl.open(fdObj, reading, writing, null); |
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} |
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|
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/** |
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* Constructs a file channel by opening a file using a dfd/path pair |
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*/ |
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static FileChannel newFileChannel(int dfd, |
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UnixPath path, |
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String pathForPermissionCheck, |
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117 |
Set<? extends OpenOption> options, |
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int mode) |
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119 |
throws UnixException |
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120 |
{ |
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121 |
Flags flags = Flags.toFlags(options); |
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122 |
|
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123 |
// default is reading; append => writing |
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124 |
if (!flags.read && !flags.write) { |
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125 |
if (flags.append) { |
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126 |
flags.write = true; |
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127 |
} else { |
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flags.read = true; |
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129 |
} |
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130 |
} |
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131 |
|
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132 |
// validation |
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133 |
if (flags.read && flags.append) |
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134 |
throw new IllegalArgumentException("READ + APPEND not allowed"); |
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135 |
if (flags.append && flags.truncateExisting) |
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throw new IllegalArgumentException("APPEND + TRUNCATE_EXISTING not allowed"); |
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137 |
|
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138 |
FileDescriptor fdObj = open(dfd, path, pathForPermissionCheck, flags, mode); |
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return FileChannelImpl.open(fdObj, flags.read, flags.write, null); |
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140 |
} |
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|
141 |
|
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142 |
/** |
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143 |
* Constructs a file channel by opening the given file. |
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144 |
*/ |
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145 |
static FileChannel newFileChannel(UnixPath path, |
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146 |
Set<? extends OpenOption> options, |
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147 |
int mode) |
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148 |
throws UnixException |
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149 |
{ |
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150 |
return newFileChannel(-1, path, null, options, mode); |
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151 |
} |
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|
152 |
|
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|
153 |
/** |
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154 |
* Constructs an asynchronous file channel by opening the given file. |
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155 |
*/ |
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156 |
static AsynchronousFileChannel newAsynchronousFileChannel(UnixPath path, |
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157 |
Set<? extends OpenOption> options, |
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158 |
int mode, |
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|
159 |
ThreadPool pool) |
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|
160 |
throws UnixException |
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|
161 |
{ |
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162 |
Flags flags = Flags.toFlags(options); |
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|
163 |
|
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|
164 |
// default is reading |
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165 |
if (!flags.read && !flags.write) { |
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|
166 |
flags.read = true; |
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167 |
} |
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|
168 |
|
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|
169 |
// validation |
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170 |
if (flags.append) |
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171 |
throw new UnsupportedOperationException("APPEND not allowed"); |
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|
172 |
|
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173 |
// for now use simple implementation |
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174 |
FileDescriptor fdObj = open(-1, path, null, flags, mode); |
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175 |
return SimpleAsynchronousFileChannelImpl.open(fdObj, flags.read, flags.write, pool); |
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176 |
} |
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|
177 |
|
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|
178 |
/** |
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|
179 |
* Opens file based on parameters and options, returning a FileDescriptor |
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|
180 |
* encapsulating the handle to the open file. |
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|
181 |
*/ |
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|
182 |
static FileDescriptor open(int dfd, |
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|
183 |
UnixPath path, |
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|
184 |
String pathForPermissionCheck, |
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|
185 |
Flags flags, |
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|
186 |
int mode) |
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|
187 |
throws UnixException |
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|
188 |
{ |
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|
189 |
// map to oflags |
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190 |
int oflags; |
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|
191 |
if (flags.read && flags.write) { |
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|
192 |
oflags = O_RDWR; |
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|
193 |
} else { |
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|
194 |
oflags = (flags.write) ? O_WRONLY : O_RDONLY; |
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195 |
} |
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|
196 |
if (flags.write) { |
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|
197 |
if (flags.truncateExisting) |
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|
198 |
oflags |= O_TRUNC; |
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|
199 |
if (flags.append) |
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|
200 |
oflags |= O_APPEND; |
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|
201 |
|
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|
202 |
// create flags |
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|
203 |
if (flags.createNew) { |
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|
204 |
byte[] pathForSysCall = path.asByteArray(); |
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|
205 |
|
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|
206 |
// throw exception if file name is "." to avoid confusing error |
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|
207 |
if ((pathForSysCall[pathForSysCall.length-1] == '.') && |
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|
208 |
(pathForSysCall.length == 1 || |
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|
209 |
(pathForSysCall[pathForSysCall.length-2] == '/'))) |
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|
210 |
{ |
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|
211 |
throw new UnixException(EEXIST); |
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|
212 |
} |
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|
213 |
oflags |= (O_CREAT | O_EXCL); |
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|
214 |
} else { |
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|
215 |
if (flags.create) |
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|
216 |
oflags |= O_CREAT; |
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|
217 |
} |
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|
218 |
} |
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|
219 |
|
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|
220 |
// follow links by default |
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|
221 |
boolean followLinks = true; |
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|
222 |
if (!flags.createNew && (flags.noFollowLinks || flags.deleteOnClose)) { |
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|
223 |
followLinks = false; |
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|
224 |
oflags |= O_NOFOLLOW; |
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|
225 |
} |
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|
226 |
|
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|
227 |
if (flags.dsync) |
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|
228 |
oflags |= O_DSYNC; |
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|
229 |
if (flags.sync) |
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|
230 |
oflags |= O_SYNC; |
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|
231 |
|
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|
232 |
// permission check before we open the file |
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233 |
SecurityManager sm = System.getSecurityManager(); |
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if (sm != null) { |
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if (pathForPermissionCheck == null) |
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pathForPermissionCheck = path.getPathForPermissionCheck(); |
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if (flags.read) |
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sm.checkRead(pathForPermissionCheck); |
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if (flags.write) |
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sm.checkWrite(pathForPermissionCheck); |
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if (flags.deleteOnClose) |
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sm.checkDelete(pathForPermissionCheck); |
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} |
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244 |
|
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int fd; |
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try { |
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if (dfd >= 0) { |
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fd = openat(dfd, path.asByteArray(), oflags, mode); |
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249 |
} else { |
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fd = UnixNativeDispatcher.open(path, oflags, mode); |
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} |
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} catch (UnixException x) { |
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// Linux error can be EISDIR or EEXIST when file exists |
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254 |
if (flags.createNew && (x.errno() == EISDIR)) { |
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255 |
x.setError(EEXIST); |
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256 |
} |
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257 |
|
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258 |
// handle ELOOP to avoid confusing message |
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259 |
if (!followLinks && (x.errno() == ELOOP)) { |
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x = new UnixException(x.getMessage() + " (NOFOLLOW_LINKS specified)"); |
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|
261 |
} |
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262 |
|
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|
263 |
throw x; |
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|
264 |
} |
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|
265 |
|
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|
266 |
// unlink file immediately if delete on close. The spec is clear that |
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267 |
// an implementation cannot guarantee to unlink the correct file when |
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// replaced by an attacker after it is opened. |
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|
269 |
if (flags.deleteOnClose) { |
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|
270 |
try { |
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|
271 |
if (dfd >= 0) { |
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|
272 |
unlinkat(dfd, path.asByteArray(), 0); |
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|
273 |
} else { |
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|
274 |
unlink(path); |
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|
275 |
} |
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|
276 |
} catch (UnixException ignore) { |
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277 |
// best-effort |
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|
278 |
} |
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|
279 |
} |
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|
280 |
|
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|
281 |
// create java.io.FileDescriptor |
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FileDescriptor fdObj = new FileDescriptor(); |
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|
283 |
fdAccess.set(fdObj, fd); |
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|
284 |
return fdObj; |
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|
285 |
} |
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|
286 |
} |