/*------------------------------------------------------------------*/
/* testitimer.c                                                     */
/* The setitimer function.                                          */
/* Author: Bob Dondero                                              */
/*------------------------------------------------------------------*/

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <signal.h>
#include <sys/time.h>

/*------------------------------------------------------------------*/

static void myHandler(int iSig)

/* This function is intended to be a handler for signals of various
   types.  Print iSig to stdout. */

{
   printf("In myHandler with argument %d\n", iSig);
}

/*------------------------------------------------------------------*/

int main(void)

/* Illustrate the setitimer() function. */

{
   int iRet;
   void (*pfRet)(int);
   struct itimerval sTimer;

   pfRet = signal(SIGPROF, myHandler);
   assert(pfRet != SIG_ERR);

   /* Create an interval timer to generate a SIGPROF signal after
      A seconds and B microseconds of virtual time.  Thereafter
      repeatedly generate a SIGPROF signal at C second, D microsecond
      intervals of virtual time. */
   sTimer.it_value.tv_sec = 1;      /* A */
   sTimer.it_value.tv_usec = 0;     /* B */
   sTimer.it_interval.tv_sec = 1;   /* C */
   sTimer.it_interval.tv_usec = 0;  /* D */
   iRet = setitimer(ITIMER_PROF, &sTimer, NULL);
   assert(iRet != -1);

   printf("Entering an infinite loop\n");
   for (;;)
      ;

   return 0;
}