udiff
if (udiff(lp[0] * EEP_SCALE, target) < EEP_DELTA) {
long udiff;
udiff = a->tv_usec - b->tv_usec;
return (double)(sdiff * 1000000 + udiff) / 1e6;
udiff(preferred_time, pfx->pfx_pltimeexpire) > rai->rai_clockskew) {
udiff(valid_time, pfx->pfx_vltimeexpire) > rai->rai_clockskew) {