author | mchung |
Tue, 06 Nov 2018 10:01:16 -0800 | |
changeset 52427 | 3c6aa484536c |
parent 47460 | b6d959fae9ef |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 2018, Oracle and/or its affiliates. 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. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* 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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import jdk.internal.access.SharedSecrets; |
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import jdk.internal.access.JavaIOFileDescriptorAccess; |
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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 static sun.nio.fs.UnixNativeDispatcher.*; |
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import static sun.nio.fs.UnixConstants.*; |
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/** |
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* Factory for FileChannels and AsynchronousFileChannels |
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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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protected 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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protected 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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boolean direct; |
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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 && O_NOFOLLOW != 0) { |
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flags.noFollowLinks = true; |
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continue; |
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} |
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if (ExtendedOptions.DIRECT.matches(option)) { |
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flags.direct = true; |
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continue; |
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} |
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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(option + " not supported"); |
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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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* Constructs a file channel from an existing (open) file descriptor |
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*/ |
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static FileChannel newFileChannel(int fd, String path, 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, path, reading, writing, false, null); |
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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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Set<? extends OpenOption> options, |
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int mode) |
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throws UnixException |
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125 |
{ |
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Flags flags = Flags.toFlags(options); |
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127 |
|
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// default is reading; append => writing |
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129 |
if (!flags.read && !flags.write) { |
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130 |
if (flags.append) { |
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flags.write = true; |
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} else { |
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flags.read = true; |
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134 |
} |
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135 |
} |
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136 |
|
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137 |
// validation |
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138 |
if (flags.read && flags.append) |
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139 |
throw new IllegalArgumentException("READ + APPEND not allowed"); |
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140 |
if (flags.append && flags.truncateExisting) |
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141 |
throw new IllegalArgumentException("APPEND + TRUNCATE_EXISTING not allowed"); |
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142 |
|
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143 |
FileDescriptor fdObj = open(dfd, path, pathForPermissionCheck, flags, mode); |
47428 | 144 |
return FileChannelImpl.open(fdObj, path.toString(), flags.read, |
145 |
flags.write, flags.direct, null); |
|
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146 |
} |
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147 |
|
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148 |
/** |
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149 |
* Constructs a file channel by opening the given file. |
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150 |
*/ |
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151 |
static FileChannel newFileChannel(UnixPath path, |
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152 |
Set<? extends OpenOption> options, |
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153 |
int mode) |
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154 |
throws UnixException |
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155 |
{ |
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156 |
return newFileChannel(-1, path, null, options, mode); |
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157 |
} |
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|
158 |
|
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|
159 |
/** |
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160 |
* Constructs an asynchronous file channel by opening the given file. |
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161 |
*/ |
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162 |
static AsynchronousFileChannel newAsynchronousFileChannel(UnixPath path, |
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163 |
Set<? extends OpenOption> options, |
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164 |
int mode, |
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165 |
ThreadPool pool) |
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166 |
throws UnixException |
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|
167 |
{ |
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168 |
Flags flags = Flags.toFlags(options); |
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169 |
|
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|
170 |
// default is reading |
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|
171 |
if (!flags.read && !flags.write) { |
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172 |
flags.read = true; |
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173 |
} |
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|
174 |
|
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|
175 |
// validation |
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|
176 |
if (flags.append) |
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|
177 |
throw new UnsupportedOperationException("APPEND not allowed"); |
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|
178 |
|
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|
179 |
// for now use simple implementation |
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180 |
FileDescriptor fdObj = open(-1, path, null, flags, mode); |
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181 |
return SimpleAsynchronousFileChannelImpl.open(fdObj, flags.read, flags.write, pool); |
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|
182 |
} |
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|
183 |
|
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|
184 |
/** |
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|
185 |
* Opens file based on parameters and options, returning a FileDescriptor |
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|
186 |
* encapsulating the handle to the open file. |
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|
187 |
*/ |
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|
188 |
protected static FileDescriptor open(int dfd, |
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|
189 |
UnixPath path, |
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|
190 |
String pathForPermissionCheck, |
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|
191 |
Flags flags, |
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|
192 |
int mode) |
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|
193 |
throws UnixException |
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|
194 |
{ |
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|
195 |
// map to oflags |
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|
196 |
int oflags; |
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|
197 |
if (flags.read && flags.write) { |
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|
198 |
oflags = O_RDWR; |
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|
199 |
} else { |
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|
200 |
oflags = (flags.write) ? O_WRONLY : O_RDONLY; |
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|
201 |
} |
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|
202 |
if (flags.write) { |
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|
203 |
if (flags.truncateExisting) |
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|
204 |
oflags |= O_TRUNC; |
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|
205 |
if (flags.append) |
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|
206 |
oflags |= O_APPEND; |
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|
207 |
|
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|
208 |
// create flags |
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|
209 |
if (flags.createNew) { |
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|
210 |
byte[] pathForSysCall = path.asByteArray(); |
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|
211 |
|
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|
212 |
// throw exception if file name is "." to avoid confusing error |
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|
213 |
if ((pathForSysCall[pathForSysCall.length-1] == '.') && |
3acf8e5e2ca0
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|
214 |
(pathForSysCall.length == 1 || |
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|
215 |
(pathForSysCall[pathForSysCall.length-2] == '/'))) |
3acf8e5e2ca0
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|
216 |
{ |
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|
217 |
throw new UnixException(EEXIST); |
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|
218 |
} |
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|
219 |
oflags |= (O_CREAT | O_EXCL); |
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|
220 |
} else { |
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|
221 |
if (flags.create) |
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|
222 |
oflags |= O_CREAT; |
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|
223 |
} |
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|
224 |
} |
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|
225 |
|
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|
226 |
// follow links by default |
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|
227 |
boolean followLinks = true; |
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|
228 |
if (!flags.createNew && (flags.noFollowLinks || flags.deleteOnClose)) { |
17154
e8991539c4d7
8011536: (fs) BasicFileAttributes.creationTime() should return birth time (mac)
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14342
diff
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|
229 |
if (flags.deleteOnClose && O_NOFOLLOW == 0) { |
11525
b0263ecbbdf1
7129029: (fs) Unix file system provider should be buildable on platforms that don't support O_NOFOLLOW
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|
230 |
try { |
b0263ecbbdf1
7129029: (fs) Unix file system provider should be buildable on platforms that don't support O_NOFOLLOW
littlee
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9035
diff
changeset
|
231 |
if (UnixFileAttributes.get(path, false).isSymbolicLink()) |
b0263ecbbdf1
7129029: (fs) Unix file system provider should be buildable on platforms that don't support O_NOFOLLOW
littlee
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|
232 |
throw new UnixException("DELETE_ON_CLOSE specified and file is a symbolic link"); |
b0263ecbbdf1
7129029: (fs) Unix file system provider should be buildable on platforms that don't support O_NOFOLLOW
littlee
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|
233 |
} catch (UnixException x) { |
b0263ecbbdf1
7129029: (fs) Unix file system provider should be buildable on platforms that don't support O_NOFOLLOW
littlee
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diff
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|
234 |
if (!flags.create || x.errno() != ENOENT) |
b0263ecbbdf1
7129029: (fs) Unix file system provider should be buildable on platforms that don't support O_NOFOLLOW
littlee
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|
235 |
throw x; |
b0263ecbbdf1
7129029: (fs) Unix file system provider should be buildable on platforms that don't support O_NOFOLLOW
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|
236 |
} |
b0263ecbbdf1
7129029: (fs) Unix file system provider should be buildable on platforms that don't support O_NOFOLLOW
littlee
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|
237 |
} |
2057
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|
238 |
followLinks = false; |
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|
239 |
oflags |= O_NOFOLLOW; |
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|
240 |
} |
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|
241 |
|
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if (flags.dsync) |
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oflags |= O_DSYNC; |
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if (flags.sync) |
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oflags |= O_SYNC; |
47428 | 246 |
if (flags.direct) |
247 |
oflags |= O_DIRECT; |
|
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|
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// permission check before we open the file |
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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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254 |
if (flags.read) |
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sm.checkRead(pathForPermissionCheck); |
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256 |
if (flags.write) |
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sm.checkWrite(pathForPermissionCheck); |
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258 |
if (flags.deleteOnClose) |
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sm.checkDelete(pathForPermissionCheck); |
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260 |
} |
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261 |
|
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int fd; |
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263 |
try { |
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264 |
if (dfd >= 0) { |
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265 |
fd = openat(dfd, path.asByteArray(), oflags, mode); |
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266 |
} else { |
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fd = UnixNativeDispatcher.open(path, oflags, mode); |
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268 |
} |
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269 |
} catch (UnixException x) { |
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270 |
// Linux error can be EISDIR or EEXIST when file exists |
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271 |
if (flags.createNew && (x.errno() == EISDIR)) { |
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272 |
x.setError(EEXIST); |
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273 |
} |
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274 |
|
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275 |
// handle ELOOP to avoid confusing message |
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276 |
if (!followLinks && (x.errno() == ELOOP)) { |
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277 |
x = new UnixException(x.getMessage() + " (NOFOLLOW_LINKS specified)"); |
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|
278 |
} |
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|
279 |
|
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|
280 |
throw x; |
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|
281 |
} |
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|
282 |
|
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|
283 |
// unlink file immediately if delete on close. The spec is clear that |
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284 |
// an implementation cannot guarantee to unlink the correct file when |
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285 |
// replaced by an attacker after it is opened. |
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|
286 |
if (flags.deleteOnClose) { |
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|
287 |
try { |
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|
288 |
if (dfd >= 0) { |
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|
289 |
unlinkat(dfd, path.asByteArray(), 0); |
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|
290 |
} else { |
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|
291 |
unlink(path); |
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|
292 |
} |
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|
293 |
} catch (UnixException ignore) { |
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|
294 |
// best-effort |
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|
295 |
} |
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|
296 |
} |
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|
297 |
|
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|
298 |
// create java.io.FileDescriptor |
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|
299 |
FileDescriptor fdObj = new FileDescriptor(); |
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|
300 |
fdAccess.set(fdObj, fd); |
27263
819f5f87d485
8023173: FileDescriptor should respect append flag
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|
301 |
fdAccess.setAppend(fdObj, flags.append); |
2057
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302 |
return fdObj; |
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|
303 |
} |
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|
304 |
} |