StackOverflow2013

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PO
primarykey
Id
464440
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
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0
CommunityOwnedDate
CreationDate
2009-01-21T08:29:15.283
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0
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2009-01-21T08:41:56.053
LastEditDate
2009-01-21T08:41:56.053
LastEditorUserId
6309
OwnerUserId
6309
ParentId
464391
PostTypeId
2
Score
1
ViewCount
0
LastEditorDisplayName
VonC
text
Body
You could also look at the Gnu ClassPath implementation of <a href="http://cvs.savannah.gnu.org/viewvc/classpath/java/io/File.java?revision=1.70&root=classpath&view=markup" rel="nofollow noreferrer">java.lang.File</a> They implemented the function based on JNI calls: <pre><code>native/jni/java-io/java_io_VMFile.c: set_file_permissions: new helper function. Java_java_io_VMFile_setReadable: new native method to bakcup 1.6 methods in VMFile.java. </code></pre> <a href="http://cvs.savannah.gnu.org/viewvc/classpath/vm/reference/java/io/VMFile.java?revision=1.13&root=classpath&view=markup" rel="nofollow noreferrer">VMFile.java</a> declares the call: <pre><code> /** * Set the write permission of the file. */ public static synchronized native boolean setWritable(String path, boolean writable, boolean ownerOnly); </code></pre> <a href="http://cvs.savannah.gnu.org/viewvc/classpath/native/jni/java-io/java_io_VMFile.c?revision=1.17&root=classpath&view=markup" rel="nofollow noreferrer">native/jni/java-io/java_io_VMFile.c</a> does implement the desired function... <pre><code>JNIEXPORT jboolean JNICALL Java_java_io_VMFile_setWritable (JNIEnv *env, jclass clazz __attribute__ ((__unused__)), jstring name, jboolean writable, jboolean ownerOnly) { return set_file_permissions (env, name, writable, ownerOnly, CPFILE_FLAG_WRITE); } [...] result = cpio_chmod (filename, permissions); </code></pre> So... if you really want it, it is possible to implement it, by looking at the <a href="http://acapulco.dyndns.org/manual/src/work/gcc-4.3.0/libjava/classpath/native/jni/native-lib/cpio.c" rel="nofollow noreferrer">source of cpio.c</a>: it calls <code>chmod</code> from libc standard library (<a href="http://gnuwin32.sourceforge.net/packages/libgw32c.htm" rel="nofollow noreferrer">LibGW32C</a> does port some of those functions to Windows)
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1. POHow to change file permissions from Java 1.4.2?
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1. PTAnswer
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1. USVonC
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1. USVonC
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