clock_t times(struct tms *buf);
struct tms is as defined in /.us/include/sys/times.h:
struct tms { clock_t tms_utime; /* user time */ clock_t tms_stime; /* system time */ clock_t tms_cutime; /* user time of children */ clock_t tms_cstime; /* system time of children */ };
times returns the number of clock ticks that have elapsed since the system has been up.