Function timevaladd

freebsd/kern/kern_time.c:990–997

* Add and subtract routines for timevals. * N.B.: subtract routine doesn't deal with * results which are before the beginning, * it just gets very confused in this case. * Caveat emptor. */

 * Caveat emptor.
 */
void
timevaladd(struct timeval *t1, const struct timeval *t2)
{

	t1->tv_sec += t2->tv_sec;
	t1->tv_usec += t2->tv_usec;
	timevalfix(t1);
}

void
timevalsub(struct timeval *t1, const struct timeval *t2)