Function sysctl_kern_ttys

freebsd/kern/tty.c:1307–1335

}

static int
sysctl_kern_ttys(SYSCTL_HANDLER_ARGS)
{
	unsigned long lsize;
	struct xtty *xtlist, *xt;
	struct tty *tp;
	int error;

	sx_slock(&tty_list_sx);
	lsize = tty_list_count * sizeof(struct xtty);
	if (lsize == 0) {
		sx_sunlock(&tty_list_sx);
		return (0);
	}

	xtlist = xt = malloc(lsize, M_TTY, M_WAITOK);

	TAILQ_FOREACH(tp, &tty_list, t_list) {
		tty_lock(tp);
		tty_to_xtty(tp, xt);
		tty_unlock(tp);
		xt++;
	}
	sx_sunlock(&tty_list_sx);

	error = SYSCTL_OUT(req, xtlist, lsize);
	free(xtlist, M_TTY);
	return (error);
}

SYSCTL_PROC(_kern, OID_AUTO, ttys, CTLTYPE_OPAQUE|CTLFLAG_RD|CTLFLAG_MPSAFE,
	0, 0, sysctl_kern_ttys, "S,xtty", "List of TTYs");