cygwin1.dll bug in open(O_EXCL)

[Eric Blake <ebb9 at byu dot net>]

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I finally found root cause for the tar issue reported here:
http://cygwin.com/ml/cygwin/2007-08/msg00553.html

$ cat foo.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>

int main(int argc, char**argv)
{
  int fd;
  symlink ("oops", "broken");
  fd = open ("broken", O_WRONLY|O_CREAT|O_EXCL, 0600);
  printf ("fd=%d, errno=%d: %s\n", fd, errno, strerror (errno));
  return 0;
}
$ ./foo
fd=3, errno=0: No error
$ ls -F oops broken
broken@  oops

According to POSIX, this should have failed with EEXIST, and oops should
not have been created.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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