NSECPERSEC
tlocal = tstamp.tv_sec * NSECPERSEC + tstamp.tv_nsec;
trecv = letoh32(tframe.sec) * NSECPERSEC +
(letoh32(tframe.frac) * NSECPERSEC >> 32);
tlocal = tstamp.tv_sec * NSECPERSEC + tstamp.tv_nsec;
trecv = letoh32(tframe.sec) * NSECPERSEC +
(letoh32(tframe.frac) * NSECPERSEC >> 32);