sys/kern/kern_ntptime.c

941 	struct timeval *olddelta;
948 	struct timeval delta, olddelta, *deltap;
958 	error = kern_adjtime(td, deltap, &olddelta);
959 	if (uap->olddelta && error == 0)
960 		error = copyout(&olddelta, uap->olddelta, sizeof(olddelta));
965 kern_adjtime(struct thread *td, struct timeval *delta, struct timeval *olddelta)
971 	if (olddelta) {
978 		*olddelta = atv;