MILLION
tp->tv_usec += MILLION;
} else if (tp->tv_usec > MILLION) {
tp->tv_usec -= MILLION;
} while (tp->tv_usec > MILLION);
if (ad->ad_timestamp.tv_usec >= MILLION) {
ad->ad_timestamp.tv_usec -= MILLION;
timep->tv_usec += MILLION;