src/time/clock.c

   1 #include <time.h>
   2 #include <limits.h>
   3
   4 int __clock_gettime(clockid_t, struct timespec *);
   5
   6 clock_t clock()
   7 {
   8         struct timespec ts;
   9
  10         if (__clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &ts))
  11                 return -1;
  12
  13         if (ts.tv_sec > LONG_MAX/1000000
  14          || ts.tv_nsec/1000 > LONG_MAX-1000000*ts.tv_sec)
  15                 return -1;
  16
  17         return ts.tv_sec*1000000 + ts.tv_nsec/1000;
  18 }