kern_sem_wait
return (kern_sem_wait(td, uap->id, 0, ts));
static int kern_sem_wait(struct thread *td, semid_t id, int tryflag,
return (kern_sem_wait(td, uap->id, 0, NULL));
return (kern_sem_wait(td, uap->id, 0, ts));
return (kern_sem_wait(td, uap->id, 1, NULL));