Re: dup2/fcntl(F_DUPFD) on haiku

[Eric Blake]

On 01/25/2011 10:02 PM, Eric Blake wrote:
> test-dup2 and test-fcntl are failing on Haiku when using both the dup2
> and cloexec modules in tandem.  I tested on Haiku alpha 2 (the latest
> formal release per haiku-os.org) rather than a nightly build, so this
> may have already been fixed by upstream development.  But it seems like
> I should be able to come up with workarounds.

Also:

$ cat foo.c
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
int main() {
  int fd1;
  int fd2;
  int i;

  fd1 = fcntl(0, F_DUPFD);
  fcntl(fd1, F_SETFD, FD_CLOEXEC);
  i = fcntl(fd1, F_GETFD);
  printf("before %d\n", i);

  fd2 = fcntl(fd1, F_DUPFD, fd2);
  i = fcntl(fd1, F_GETFD);
  printf("middle %d", i);
  i = fcntl(fd2, F_GETFD);
  printf(" %d\n", i);

  fcntl(fd1, F_SETFD, FD_CLOEXEC);
  i = fcntl(fd1, F_GETFD);
  printf("after %d", i);
  i = fcntl(fd2, F_GETFD);
  printf(" %d\n", i);
  return 0;
}
$ ./foo
before 1
middle 0 0
after 1 0

Oops - the mere act of duplicating an fd loses the FD_CLOEXEC bit on the
original; but at least it can be restored right after duplication.

-- 
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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