-void startclock P((void));
-times_t stopclock P((void));
-times_t curclock P((void));
-times_t timesadd P((times_t a, times_t b));
-times_t timessub P((times_t a, times_t b));
-char * times_str P((times_t t));
-char * walltime_str P((times_t t));
-int clock_is_running P((void));