ntv               651 kern/kern_time.c 		struct timeval ctv, ntv;
ntv               658 kern/kern_time.c 			ntv = p->p_realtimer.it_value;
ntv               659 kern/kern_time.c 			timersub(&ntv, &ctv, &ntv);
ntv               660 kern/kern_time.c 			timo = tvtohz(&ntv) - 1;