osfmk/ipc/mach_port.c

413 	mach_port_urefs_t urefs;
433 	kr = ipc_right_info(space, name, entry, typep, &urefs);
787  *		KERN_SUCCESS		Number of urefs returned.
802 	mach_port_urefs_t urefs;
826 	kr = ipc_right_info(space, name, entry, &type, &urefs);
835 			assert(urefs == 1);
845 			assert(urefs > 0);
846 			*urefsp = urefs;
868  *		KERN_SUCCESS		Modified number of urefs.
874  *		KERN_INVALID_VALUE	Impossible modification to urefs.
1393  *			generating immediate notif. would overflow urefs.