|| !WIFEXITED (status) || WEXITSTATUS (NR))
|| !WIFEXITED (status) || WEXITSTATUS (status) != NR)
main (void){  pid_t pid;  int status;  printf ("Before vfork\n");  fflush (stdout);  pid = vfork ();  if (pid == 0)    {      /* This will clobber the return pc from vfork in the parent on	 machines where it is stored on the stack, if vfork wasn't	 implemented correctly, */      noop ();      _exit (NR);    }  else if (pid < 0)    error (1, errno, "vfork");  printf ("After vfork (parent)\n");  if (waitpid (0, &status, 0) != pid      || !WIFEXITED (status) || WEXITSTATUS (NR))    exit (1);  exit (0);}