Function knote_drop

freebsd/kern/kern_event.c:2617–2624

}

static void
knote_drop(struct knote *kn, struct thread *td)
{

	if ((kn->kn_status & KN_DETACHED) == 0)
		kn->kn_fop->f_detach(kn);
	knote_drop_detached(kn, td);
}

static void
knote_drop_detached(struct knote *kn, struct thread *td)