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;
}
/* 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);
}