clock_gettime

 

/*** 컴파일시에  -lrt 를 포함하여 컴파일 ***/

 

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

 

int main(int argc, char *argv[])
{
    struct timespec tspec;
    struct tm       tm_now;

 

    clock_gettime(CLOCK_REALTIME, &tspec);

 

    localtime_r((time_t *)&tspec.tv_sec, &tm_now);

 

    fprintf(stdout, "timespec tspec.tv_sec=%ld tspec.tv_nsec=%09ld\n", tspec.tv_sec, tspec.tv_nsec);

 

    fprintf(stdout, "%04d%02d%02d%02d%02d%02d.%09ld\n", tm_now.tm_year + 1900, tm_now.tm_mon + 1, tm_now.tm_mday, tm_now.tm_hour, tm_now.tm_min, tm_now.tm_sec, tspec.tv_nsec);

}

 

실행결과

 

timespec tspec.tv_sec=1451288985 tspec.tv_nsec=200300400

20151228164945.200300400