Symbol: KQ_ASYNC
sys/kern/kern_event.c
1671
kq->kq_state |= KQ_ASYNC;
sys/kern/kern_event.c
1673
kq->kq_state &= ~KQ_ASYNC;
sys/kern/kern_event.c
2054
if (kq->kq_sigio && (kq->kq_state & KQ_ASYNC) && kq->kq_count == 1)