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timer.c

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#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/time.h>
char astbuf[] = "*";
static void myhandler(int s)
{
           write(0, astbuf, sizeof(char));
}

/* set up the myhandler handler for signal SIGPROF */
void init_timer_interrupt(void)
{
           struct sigaction newact;
              newact.sa_handler = myhandler;
                 newact.sa_flags = SA_RESTART;
                    sigemptyset(&newact.sa_mask);
                       sigaction(SIGPROF, &newact, NULL);
}

/* set the ITIMER_PROF interval timer for 2-second intervals */
void setup_interval_timer(void)
{
           struct itimerval value;
              value.it_interval.tv_sec = 2;
                 value.it_interval.tv_usec = 0;
                    value.it_value = value.it_interval;
                       setitimer(ITIMER_PROF, &value, NULL);
}

void main(int argc, char *argv[])
{
           init_timer_interrupt();
              setup_interval_timer();
              for (;;) { }
                 exit(0);
}

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