CLOCK_CALL
error = CLOCK_CALL(clock_id, timer_create, (it));
CLOCK_CALL(it->it_clockid, timer_delete, (it));
CLOCK_CALL(it->it_clockid, timer_delete, (it));
error = CLOCK_CALL(it->it_clockid, timer_settime, (it,
error = CLOCK_CALL(it->it_clockid, timer_gettime, (it, val));