timevalsub
void timevalsub(struct timeval *t1, const struct timeval *t2);
timevalsub(&waittime, &now);
static void timevalsub(struct timeval *t1, struct timeval *t2);
static void timevalsub(struct timeval *, struct timeval *, struct timeval *);
timevalsub(&result, &clk, &prev_clk);
timevalsub(&now, &clk, &epoch);
timevalsub(&select_timeout, &ifscan_timer, &now);
timevalsub(&result, &sync_kern_timer, &now);
timevalsub(&result, &next_bcast, &now);
timevalsub(&result, &no_flash, &now);
timevalsub(&result, &age_timer, &now);
timevalsub(&result, &need_kern, &now);
timevalsub(&result, &rdisc_timer, &now);
timevalsub(&aitv.it_value, &now);
timevalsub(valp, &interval2nth);
extern void timevalsub(struct timeval *, struct timeval *);