/******************************************************
**
**  R.S. Dannelly
*****************************************************/
#include <stdlib.h>
#include <sys/time.h>
#include <time.h>
#include <signal.h>


/********************************************************/
void signal_handler()
{
   // be sure to catch the next alarm
   signal (SIGALRM, signal_handler);

   printf("signal received\n");

   struct itimerval old, new;
   new.it_interval.tv_usec = 0;
   new.it_interval.tv_sec = 0;
   new.it_value.tv_usec = 0;    // microsecond delay
   new.it_value.tv_sec = 3;     // second delay
   if (setitimer (ITIMER_REAL, &new, &old) < 0)
      printf("timer not set\n");
}

/********************************************************/

int main()
{
   signal (SIGALRM, signal_handler);

   struct itimerval old, new;
   new.it_interval.tv_usec = 0;
   new.it_interval.tv_sec = 0;
   new.it_value.tv_usec = 0;
   new.it_value.tv_sec = 3;
   if (setitimer (ITIMER_REAL, &new, &old) < 0)
      printf("timer not set\n");

   // infinite loop
   for(;;);
}