124 static const struct filterops *kqueue_fo_find(int filt);
125 static void	kqueue_fo_release(int filt);
1556 kqueue_add_filteropts(int filt, const struct filterops *filtops)  in kqueue_add_filteropts()  argument
1561 	if (filt > 0 || filt + EVFILT_SYSCOUNT < 0) {  in kqueue_add_filteropts()
1564 		    ~filt, EVFILT_SYSCOUNT);  in kqueue_add_filteropts()
1568 	if (sysfilt_ops[~filt].for_fop != &null_filtops &&  in kqueue_add_filteropts()
1569 	    sysfilt_ops[~filt].for_fop != NULL)  in kqueue_add_filteropts()
1572 		sysfilt_ops[~filt].for_fop = filtops;  in kqueue_add_filteropts()
1573 		sysfilt_ops[~filt].for_refcnt = 0;  in kqueue_add_filteropts()
1581 kqueue_del_filteropts(int filt)  in kqueue_del_filteropts()  argument
1586 	if (filt > 0 || filt + EVFILT_SYSCOUNT < 0)  in kqueue_del_filteropts()
1590 	if (sysfilt_ops[~filt].for_fop == &null_filtops ||  in kqueue_del_filteropts()
1591 	    sysfilt_ops[~filt].for_fop == NULL)  in kqueue_del_filteropts()
1593 	else if (sysfilt_ops[~filt].for_refcnt != 0)  in kqueue_del_filteropts()
1596 		sysfilt_ops[~filt].for_fop = &null_filtops;  in kqueue_del_filteropts()
1597 		sysfilt_ops[~filt].for_refcnt = 0;  in kqueue_del_filteropts()
1605 kqueue_fo_find(int filt)  in kqueue_fo_find()  argument
1608 	if (filt > 0 || filt + EVFILT_SYSCOUNT < 0)  in kqueue_fo_find()
1611 	if (sysfilt_ops[~filt].for_nolock)  in kqueue_fo_find()
1612 		return sysfilt_ops[~filt].for_fop;  in kqueue_fo_find()
1615 	sysfilt_ops[~filt].for_refcnt++;  in kqueue_fo_find()
1616 	if (sysfilt_ops[~filt].for_fop == NULL)  in kqueue_fo_find()
1617 		sysfilt_ops[~filt].for_fop = &null_filtops;  in kqueue_fo_find()
1620 	return sysfilt_ops[~filt].for_fop;  in kqueue_fo_find()
1624 kqueue_fo_release(int filt)  in kqueue_fo_release()  argument
1627 	if (filt > 0 || filt + EVFILT_SYSCOUNT < 0)  in kqueue_fo_release()
1630 	if (sysfilt_ops[~filt].for_nolock)  in kqueue_fo_release()
1634 	KASSERT(sysfilt_ops[~filt].for_refcnt > 0,  in kqueue_fo_release()
1635 	    ("filter object %d refcount not valid on release", filt));  in kqueue_fo_release()
1636 	sysfilt_ops[~filt].for_refcnt--;  in kqueue_fo_release()
1651 	int error, filt, event;  in kqueue_register()  local
1664 	filt = kev->filter;  in kqueue_register()
1665 	fops = kqueue_fo_find(filt);  in kqueue_register()
1909 		kqueue_fo_release(filt);  in kqueue_register()