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