rem: ualarm(uint usec, uint interval)
add: ualarm(useconds_t usec, useconds_t interval)
context: ualarm(uint usec, uint interval){	struct itimerval value, oldValue;	value.it_value.tv_sec = 0;	value.it_value.tv_usec = usec;	value.it_interval.tv_sec = 0;	value.it_interval.tv_usec = interval;	if (setitimer(ITIMER_REAL, &value, &oldValue) < 0)		return -1;	return (oldValue.it_value.tv_sec * 1000000) + oldValue.it_value.tv_usec;}