gistfile1.txt

#include <time.h>

int main() {
    struct timespec start;
    struct timespec end;
    clock_gettime(CLOCK_REALTIME, &start);
    for(int i = 0; i < 5000000; i++) {
        clock_gettime(CLOCK_REALTIME, &end);
    }
    printf("%lu %lu\n", end.tv_sec - start.tv_sec, end.tv_nsec - start.tv_nsec);
}