122 static const struct filterops *kqueue_fo_find(int filt);
123 static void	kqueue_fo_release(int filt);
1407 kqueue_add_filteropts(int filt, const struct filterops *filtops)  in kqueue_add_filteropts()  argument
1412 	if (filt > 0 || filt + EVFILT_SYSCOUNT < 0) {  in kqueue_add_filteropts()
1415 		    ~filt, EVFILT_SYSCOUNT);  in kqueue_add_filteropts()
1419 	if (sysfilt_ops[~filt].for_fop != &null_filtops &&  in kqueue_add_filteropts()
1420 	    sysfilt_ops[~filt].for_fop != NULL)  in kqueue_add_filteropts()
1423 		sysfilt_ops[~filt].for_fop = filtops;  in kqueue_add_filteropts()
1424 		sysfilt_ops[~filt].for_refcnt = 0;  in kqueue_add_filteropts()
1432 kqueue_del_filteropts(int filt)  in kqueue_del_filteropts()  argument
1437 	if (filt > 0 || filt + EVFILT_SYSCOUNT < 0)  in kqueue_del_filteropts()
1441 	if (sysfilt_ops[~filt].for_fop == &null_filtops ||  in kqueue_del_filteropts()
1442 	    sysfilt_ops[~filt].for_fop == NULL)  in kqueue_del_filteropts()
1444 	else if (sysfilt_ops[~filt].for_refcnt != 0)  in kqueue_del_filteropts()
1447 		sysfilt_ops[~filt].for_fop = &null_filtops;  in kqueue_del_filteropts()
1448 		sysfilt_ops[~filt].for_refcnt = 0;  in kqueue_del_filteropts()
1456 kqueue_fo_find(int filt)  in kqueue_fo_find()  argument
1459 	if (filt > 0 || filt + EVFILT_SYSCOUNT < 0)  in kqueue_fo_find()
1462 	if (sysfilt_ops[~filt].for_nolock)  in kqueue_fo_find()
1463 		return sysfilt_ops[~filt].for_fop;  in kqueue_fo_find()
1466 	sysfilt_ops[~filt].for_refcnt++;  in kqueue_fo_find()
1467 	if (sysfilt_ops[~filt].for_fop == NULL)  in kqueue_fo_find()
1468 		sysfilt_ops[~filt].for_fop = &null_filtops;  in kqueue_fo_find()
1471 	return sysfilt_ops[~filt].for_fop;  in kqueue_fo_find()
1475 kqueue_fo_release(int filt)  in kqueue_fo_release()  argument
1478 	if (filt > 0 || filt + EVFILT_SYSCOUNT < 0)  in kqueue_fo_release()
1481 	if (sysfilt_ops[~filt].for_nolock)  in kqueue_fo_release()
1485 	KASSERT(sysfilt_ops[~filt].for_refcnt > 0,  in kqueue_fo_release()
1487 	sysfilt_ops[~filt].for_refcnt--;  in kqueue_fo_release()
1502 	int error, filt, event;  in kqueue_register()  local
1515 	filt = kev->filter;  in kqueue_register()
1516 	fops = kqueue_fo_find(filt);  in kqueue_register()
1760 		kqueue_fo_release(filt);  in kqueue_register()