399     if (tv->tv_sec < 0 || tv->tv_usec < 0 || tv->tv_usec >= 1000000)  in itimerfix()
401     if (tv->tv_sec == 0 && tv->tv_usec != 0 && tv->tv_usec < tick)  in itimerfix()
402         tv->tv_usec = tick;  in itimerfix()
419     if (itp->it_value.tv_usec < usec) {  in itimerdecr()
422             usec -= itp->it_value.tv_usec;  in itimerdecr()
425         itp->it_value.tv_usec += 1000000;  in itimerdecr()
428     itp->it_value.tv_usec -= usec;  in itimerdecr()
436         itp->it_value.tv_usec -= usec;  in itimerdecr()
437         if (itp->it_value.tv_usec < 0) {  in itimerdecr()
438             itp->it_value.tv_usec += 1000000;  in itimerdecr()
442         itp->it_value.tv_usec = 0;        /* sec is already 0 */  in itimerdecr()
457     t1->tv_usec += t2->tv_usec;  in timevaladd()
465     t1->tv_usec -= t2->tv_usec;  in timevalsub()
472     if (t1->tv_usec < 0) {  in timevalfix()
474         t1->tv_usec += 1000000;  in timevalfix()
476     if (t1->tv_usec >= 1000000) {  in timevalfix()
478         t1->tv_usec -= 1000000;  in timevalfix()
500         (lasttime->tv_sec == 0 && lasttime->tv_usec == 0)) {  in ratecheck()
574     usec = tv->tv_usec;