Does anyone have a really simple example of setitimer I'm looking online and I found one but its kinda of confusing to understand
Code:
#include <stdio.h>
#include <signal.h>
#include <sys/time.h>
#define INTERVAL 5
int howmany = 0;
void alarm_wakeup (int i)
{
struct itimerval tout_val;
signal(SIGALRM,alarm_wakeup);
howmany += INTERVAL;
printf("\n%d sec up partner, Wakeup!!!\n",howmany);
tout_val.it_interval.tv_sec = 0;
tout_val.it_interval.tv_usec = 0;
tout_val.it_value.tv_sec = INTERVAL; /* 10 seconds timer */
tout_val.it_value.tv_usec = 0;
setitimer(ITIMER_REAL, &tout_val,0);
}
void exit_func (int i)
{
signal(SIGINT,exit_func);
printf("\nBye Bye!!!\n");
exit(0);
}
int main ()
{
struct itimerval tout_val;
tout_val.it_interval.tv_sec = 0;
tout_val.it_interval.tv_usec = 0;
tout_val.it_value.tv_sec = INTERVAL; /* 10 seconds timer */
tout_val.it_value.tv_usec = 0;
setitimer(ITIMER_REAL, &tout_val,0);
signal(SIGALRM,alarm_wakeup); /* set the Alarm signal capture */
signal(SIGINT,exit_func);
while (1)
{
//printf("!");
}
return 0;
}
I dont really understand what calls the exit signal