timersub
timersub(&m_interval, &(*it)->m_interval, &m_interval);
timersub(&(*it)->m_interval, &m_interval,
timersub(&now, ×tamp, &elapsed);
timersub(&removeGracePeriod, &elapsed, &countdown);
#ifndef timersub
timersub(&finish, start, &diff);
timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
timersub(&tv_now, &tv_start, &tv_delta);
timersub(&u_end, &u_start, &u_elapsed);
timersub(&s_end, &s_start, &s_elapsed);
timersub(&end.ru_utime, &start.ru_stime, &elapsed.ru_stime);
timersub(&end.ru_utime, &start.ru_utime, &elapsed.ru_utime);
timersub(&e_end, &e_start, &e_elapsed);
#ifndef timersub
timersub(&next_sendtime, &time_waited, &tv);
timersub(&timeout, &time_waited, &tv);
timersub(&tv, &starttime, &time_waited);
timersub(&tv, &cd->last_recv_time, &tdiff);
timersub(&timeout, &now, &delta);
timersub(&timeout, &now, &delta);
timersub(&timelimit, &tv, &tv);
timersub(deadline, &tv, &tv);
timersub(&deadline, &tv, &tv);
timersub(&get, &clear, &get);
timersub(&tend, &tstart, &tdiff);
timersub(&tend, &tstart, &tdiff);
timersub(&after.ru_utime, &before.ru_utime, &total);
timersub(&end, &c.time, &c.time);
timersub(&et, &st, &rt);
timersub(&ct, bt, &dt);
timersub(&t2, &t1, &diff);
timersub(&ruend.ru_stime, &rustart.ru_stime, &tvtmp);
timersub(&ruend.ru_utime, &rustart.ru_utime, &tvtmp);
timersub(&ruend.ru_stime, &rustart.ru_stime, &tvtmp);
timersub(&t1, &t0, &kio->kio_elapsed);
timersub(&t1, &t0, &kio->kio_elapsed);
#ifndef timersub
timersub(&packets[i+1], &packets[i], &result);
timersub(&args[client].packets[i], &sent[i], &result);
timersub(cur, prev, &delta);
timersub(&toc, &tic, &toc);
timersub(&sub_tv, &ref_tv, &res_tv);
timersub(&sub_tv, &ref_tv, &res_tv);
timersub(&sub_tv, &ref_tv, &res_tv);
timersub(&sub_tv, &ref_tv, &res_tv);
timersub(&sub_tv, &ref_tv, &res_tv);
timersub(&kth->ktr_time, &prevtime_e, &temp);
timersub(&prevtime, &kth->ktr_time, &temp);
timersub(&kth->ktr_time, &prevtime, &temp);
timersub(&end, &now, &delta);
timersub(&now, &end, &delta);
timersub(&now, &then, &now);
timersub(&new_tv, &old_tv, &tv);
timersub(&today, &usec, &yesterday);
timersub(&today, &lp->time, &diff);
timersub(&up->ut_tv, &lp->time, &secs);
timersub(&clock_shift, &ut_timecopy, &clock_shift);
timersub(&lp->time, &clock_shift, &lp->time);
timersub(&end, &tv, &tv);
timersub(&end, &(x), &td); \
timersub(&tv_end, &tv_start, &tv);
timersub(&tv_now, &tv_start, &tv);