#include <sys/time.h>
#include <signal.h>
#include <stdio.h>

void handler(int sig);

main()
{
  struct itimerval rttimer;
  struct itimerval old_rttimer;

  signal(SIGALRM,handler);
  rttimer.it_value.tv_sec     = 1; /* A signal will be sent one second*/
  rttimer.it_value.tv_usec    = 0; /*  from when this is called */ 
  rttimer.it_interval.tv_sec  = 1; /* If the timer is not reset, the */
  rttimer.it_interval.tv_usec = 0; /*  signal will be sent every second */

  setitimer (ITIMER_REAL, &rttimer, &old_rttimer);

  for(;;);
}

void handler(int sig)
{
  int i;
  printf("signal handler for %d\n",sig);
}