1 #include <time.h> 2 #include <limits.h> 3 #include <unsupported_api.h> 4 clock()5clock_t clock() 6 { 7 struct timespec ts; 8 9 unsupported_api(__FUNCTION__); 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 } 19