+ /* To provide updates on every full second (as good as possible)
+ * we don’t use sleep(interval) but we sleep until the next
+ * second (with microsecond precision) plus (interval-1)
+ * seconds. */
+ struct timeval current_time;
+ gettimeofday(¤t_time, NULL);
+ struct timespec ts = {interval - 1, (10e5 - current_time.tv_usec) * 1000};
+ nanosleep(&ts, NULL);