On 07/26/2012 03:33 AM, Jez Wain wrote:
> On the new server, which produced the erroneous result,
> fcntl.h defines both O_NOFOLLOW and AT_SYMLINK_NOFOLLOW
OK, thanks, but why do you later mention
_XOPEN_SOURCE? Is that relevant?
It sounds like we need to add a test for this AIX bug,
and then put a workaround into tar. Let's start with the
test. Suppose you compile the following test program:
#include <fcntl.h>
int
main (void)
{
int flags = O_NOFOLLOW | O_WRONLY | O_CREAT;
mode_t perms = S_IRUSR | S_IWUSR;
return openat (AT_FDCWD, "symlink", flags, perms) < 0 ? 0 : 1;
}
Put this into a.out, and then run these shell commands:
rm -f file symlink
touch file
ln -s file symlink
truss ./a.out
What does the tail end of the "truss" output say,
starting with the first mention of "symlink"?
On a working system, openat should fail and the
program should exit with status 0. My guess is
that on AIX openat succeeds, and the program exits
with status 1.
