clock_gettime(CLOCK_MONOTONIC, &t1); // FIXME: check errors
timespecsub(&t1, &t0, &td);
debug("td {tv_sec = %ld, tv_nsec = %ld}\n", td.tv_sec, td.tv_nsec);
clock_gettime(CLOCK_MONOTONIC, &t1); // FIXME: check errors
timespecsub(&t1, &t0, &td);
debug("td {tv_sec = %ld, tv_nsec = %ld}\n", td.tv_sec, td.tv_nsec);