Function sigqueue_get

freebsd/kern/kern_sig.c:308–349

* Get a signal's ksiginfo. * Return: * 0 - signal not found * others - signal number */

 *	others	-	signal number
 */
static int
sigqueue_get(sigqueue_t *sq, int signo, ksiginfo_t *si)
{
	struct proc *p = sq->sq_proc;
	struct ksiginfo *ksi, *next;
	int count = 0;

	KASSERT(sq->sq_flags & SQ_INIT, ("sigqueue not inited"));

	if (!SIGISMEMBER(sq->sq_signals, signo))
		return (0);

	if (SIGISMEMBER(sq->sq_ptrace, signo)) {
		count++;
		SIGDELSET(sq->sq_ptrace, signo);
		si->ksi_flags |= KSI_PTRACE;
	}
	if (SIGISMEMBER(sq->sq_kill, signo)) {
		count++;
		if (count == 1)
			SIGDELSET(sq->sq_kill, signo);
	}

	TAILQ_FOREACH_SAFE(ksi, &sq->sq_list, ksi_link, next) {
		if (ksi->ksi_signo == signo) {
			if (count == 0) {
				TAILQ_REMOVE(&sq->sq_list, ksi, ksi_link);
				ksi->ksi_sigq = NULL;
				ksiginfo_copy(ksi, si);
				if (ksiginfo_tryfree(ksi) && p != NULL)
					p->p_pendingcnt--;
			}
			if (++count > 1)
				break;
		}
	}

	if (count <= 1)
		SIGDELSET(sq->sq_signals, signo);
	si->ksi_signo = signo;
	return (signo);
}

void
sigqueue_take(ksiginfo_t *ksi)