ITIMER_PROF
if (timevalisset(&p->p_timer[ITIMER_PROF].it_value) &&
itimerdecr(&p->p_timer[ITIMER_PROF], ustick) == 0) {
if (uap->which > ITIMER_PROF)
if (uap->which > ITIMER_PROF)
case ITIMER_PROF: