Linux应用程序使用的系统时间

#include <stdio.h>

#include <time.h>


int main(void)
{
        int time;
        struct timespec res;

        while(1)
        {
                clock_gettime(CLOCK_REALTIME, &res);

                printf("time is :%d\n", res.tv_sec);

                sleep(3);
        }

        return 0;
}