timespecDiff.c

timespec timespecDiff(timespec start, timespec stop) {
    timespec ret;
    ret.tv_sec = stop.tv_sec - start.tv_sec;
    if(start.tv_nsec > stop.tv_nsec) {
        ret.tv_nsec = 1000000000 - start.tv_nsec + stop.tv_nsec;
        ret.tv_sec--;
    } else
        ret.tv_nsec = stop.tv_nsec - start.tv_nsec;
    return ret;
}