ref: 94d2ee527af44610a498d6f6adbba8f0b6d76f17
dir: /sys/src/ape/lib/ap/gen/clock.c/
#include <time.h>
#include <sys/times.h>
clock_t
clock(void)
{
struct tms t;
if(times(&t) == (clock_t)-1)
return (clock_t)-1;
return t.tms_utime+t.tms_stime;
}