getimeofday v.s. clock_gettime

gistfile1.cpp

#include <cstdio>
#include <cstdlib>

#include <sys/time.h>
#include <unistd.h>
#include <time.h>

int main()
{
    struct timeval now;
    struct timezone zone;
    struct timespec spec;

    for (;;)
    {
        sleep(1);

        gettimeofday(&now, &zone);
        clock_gettime(CLOCK_MONOTONIC, &spec);

        printf("gettimeofday: sec = %lu usec = %lu,  clock_gettime: stv.tv_sec = %d setv.nsec = %d\n", (unsigned long)now.tv_sec, (unsigned long)now.tv_usec, (int)spec.tv_sec, (int)spec.tv_nsec);
    }
}