116 static const struct filterops *kqueue_fo_find(int filt);
117 static void	kqueue_fo_release(int filt);
1401 kqueue_add_filteropts(int filt, const struct filterops *filtops)  in kqueue_add_filteropts()  argument
1406 	if (filt > 0 || filt + EVFILT_SYSCOUNT < 0) {  in kqueue_add_filteropts()
1409 		    ~filt, EVFILT_SYSCOUNT);  in kqueue_add_filteropts()
1413 	if (sysfilt_ops[~filt].for_fop != &null_filtops &&  in kqueue_add_filteropts()
1414 	    sysfilt_ops[~filt].for_fop != NULL)  in kqueue_add_filteropts()
1417 		sysfilt_ops[~filt].for_fop = filtops;  in kqueue_add_filteropts()
1418 		sysfilt_ops[~filt].for_refcnt = 0;  in kqueue_add_filteropts()
1426 kqueue_del_filteropts(int filt)  in kqueue_del_filteropts()  argument
1431 	if (filt > 0 || filt + EVFILT_SYSCOUNT < 0)  in kqueue_del_filteropts()
1435 	if (sysfilt_ops[~filt].for_fop == &null_filtops ||  in kqueue_del_filteropts()
1436 	    sysfilt_ops[~filt].for_fop == NULL)  in kqueue_del_filteropts()
1438 	else if (sysfilt_ops[~filt].for_refcnt != 0)  in kqueue_del_filteropts()
1441 		sysfilt_ops[~filt].for_fop = &null_filtops;  in kqueue_del_filteropts()
1442 		sysfilt_ops[~filt].for_refcnt = 0;  in kqueue_del_filteropts()
1450 kqueue_fo_find(int filt)  in kqueue_fo_find()  argument
1453 	if (filt > 0 || filt + EVFILT_SYSCOUNT < 0)  in kqueue_fo_find()
1456 	if (sysfilt_ops[~filt].for_nolock)  in kqueue_fo_find()
1457 		return sysfilt_ops[~filt].for_fop;  in kqueue_fo_find()
1460 	sysfilt_ops[~filt].for_refcnt++;  in kqueue_fo_find()
1461 	if (sysfilt_ops[~filt].for_fop == NULL)  in kqueue_fo_find()
1462 		sysfilt_ops[~filt].for_fop = &null_filtops;  in kqueue_fo_find()
1465 	return sysfilt_ops[~filt].for_fop;  in kqueue_fo_find()
1469 kqueue_fo_release(int filt)  in kqueue_fo_release()  argument
1472 	if (filt > 0 || filt + EVFILT_SYSCOUNT < 0)  in kqueue_fo_release()
1475 	if (sysfilt_ops[~filt].for_nolock)  in kqueue_fo_release()
1479 	KASSERT(sysfilt_ops[~filt].for_refcnt > 0,  in kqueue_fo_release()
1481 	sysfilt_ops[~filt].for_refcnt--;  in kqueue_fo_release()
1496 	int error, filt, event;  in kqueue_register()  local
1509 	filt = kev->filter;  in kqueue_register()
1510 	fops = kqueue_fo_find(filt);  in kqueue_register()
1754 		kqueue_fo_release(filt);  in kqueue_register()