This is the mail archive of the libc-hacker@sources.redhat.com mailing list for the glibc project.

Note that libc-hacker is a closed list. You may look at the archives of this list, but subscription and posting are not open.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

getpid/vfork broken

getpid does not return the correct result after vfork:

$ cat getpid.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>

int
main (void)
{
  if (vfork () == 0)
    {
      printf ("%d\n", getpid ());
      exit (0);
    }
  wait (0);
  if (vfork () == 0)
    {
      printf ("%d\n", getpid ());
      exit (0);
    }
  wait (0);
  printf ("%d\n", getpid ());
  return 0;
}
$ ./getpid
31302
31302
31302

Note that the number is actually the pid of the first child, not the
parent.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Maxfeldstraße 5, 90409 Nürnberg, Germany
Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."
Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]