Exemplo n.º 1
0
static int
do_sigwait (const sigset_t *set, int *sig)
{
  sigset_t tmp_mask;
  struct sigaction saved[NSIG];
  struct sigaction action;
  int save_errno;
  int this;

  /* Prepare set.  */
  __sigfillset (&tmp_mask);

  /* Unblock all signals in the SET and register our nice handler.  */
  action.sa_handler = ignore_signal;
  action.sa_flags = 0;
  __sigfillset (&action.sa_mask);	/* Block all signals for handler.  */

  /* Make sure we recognize error conditions by setting WAS_SIG to a
     value which does not describe a legal signal number.  */
  was_sig = -1;

  for (this = 1; this < NSIG; ++this)
    if (__sigismember (set, this))
      {
	/* Unblock this signal.  */
	__sigdelset (&tmp_mask, this);

	/* Register temporary action handler.  */
	if (__sigaction (this, &action, &saved[this]) != 0)
	  goto restore_handler;
      }

  /* Now we can wait for signals.  */
  __sigsuspend (&tmp_mask);

 restore_handler:
  save_errno = errno;

  while (--this >= 1)
    if (__sigismember (set, this))
      /* We ignore errors here since we must restore all handlers.  */
      __sigaction (this, &saved[this], NULL);

  __set_errno (save_errno);

  /* Store the result and return.  */
  *sig = was_sig;
  return was_sig == -1 ? -1 : 0;
}
Exemplo n.º 2
0
/* Set the mask of blocked signals to MASK,
   wait for a signal to arrive, and then restore the mask.  */
static int
do_sigpause (int sig_or_mask, int is_sig)
{
  sigset_t set;

  if (is_sig != 0)
    {
      /* The modern X/Open implementation is requested.  */
      if (__sigprocmask (0, NULL, &set) < 0
	  || sigdelset (&set, sig_or_mask) < 0)
	return -1;
    }
  else if (sigset_set_old_mask (&set, sig_or_mask) < 0)
    return -1;

  /* Note the sigpause() is a cancellation point.  But since we call
     sigsuspend() which itself is a cancellation point we do not have
     to do anything here.  */
  return __sigsuspend (&set);
}