File: gettimeofday.c

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/********************************************************************************************************************************/
/*                                                                                                                              */
/*  Simple single-threaded test program                                                                                         */
/*  Uses gettimeofday(), which appears in vdso page in Linux 2.6.25                                                             */
/*  Putting NO_GETTIMEOFDAY in environment stops call to gettimeofday()                                                         */
/*                                                                                                                              */
/*  Print gettimeofday                                                                                                          */
/*                                                                                                                              */
/********************************************************************************************************************************/

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

int main ()
{
  while(1) {
    struct timeval tv;
    if (! getenv("NO_GETTIMEOFDAY"))
      gettimeofday(&tv, NULL);
    printf("TIME (gettimeofday): %d\n", (int)tv.tv_sec);
    sleep(2);
  }
  return (0);
}