Truncating files does not work on shared folders (Linux guest) => Fixed in SVN/3.0.8

[Martin]

Host: Vista Guest: Ubuntu9 Vbox 3.0.2

The below c program fails to truncate fails if the file is on a shared folder The program runs on the guest, so the file is actually a file on the vista host.

• The program works fine, if the file is *not* on a shared folder.
• The program does not works, if the file *is* on a shared folder.

• I can compile it with or without O_EXCL => makes no difference. I did also run the resulting exe as root to be sure.
• The file is found and open did succeed (f has a positive value, usually 3)
• ftruncate also returns success (zero)

this is somewhat similar to bug 2257 (except that piping shorter/empty text (or dev/null) into the file actually works

#include <stdio.h> #include <fcntl.h> int main() {

int f = open("/mnt/share/text", O_WRONLY); | O_EXCL ); printf("%d", f); ftruncate(f, 0); close(f);

}

[Martin]

Create something ate the linebreaks ...

#include <stdio.h>

#include <fcntl.h>

int main() {

int f = open("/mnt/share/text", O_WRONLY); | O_EXCL );

printf("%d", f);

ftruncate(f, 0);

close(f);

}

[Martin]

some more research in existing bugs, this may be related to #3712

[Frank Mehnert]

No, this bug is not related to #3712. Actually this bug was just fixed in SVN and the fix will be part of the next maintenance release. This was a bug (missing case) in the Linux guest additions so make sure to update the additions to verify the fix.