System_Software_HandsOnList2/001a.c at main · superv13/System_Software_HandsOnList2 · GitHub

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/*
..........................................................................................................................................
Name : 001.c
Author : SHRUTI VERMA
Description : Write a separate program (for each time domain) to set a interval timer in 10sec and
                10micro second
                a. ITIMER_REAL
                b. ITIMER_VIRTUAL
                c. ITIMER_PROF
Date : 29 Sep 2025
..........................................................................................................................................
*/

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

int i = 0;
void my_handler(int signal) {

    if(signal == SIGALRM) {
        i++;

        time_t now;
        time(&now);

        printf("%d round : %s\n", i, ctime(&now));
        fflush(stdout);
    }
}

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

    struct itimerval timer;
    timer.it_value.tv_sec = 10;
    timer.it_value.tv_usec = 0 ;

    timer.it_interval.tv_sec = 10;
    timer.it_interval.tv_usec = 10;

    setitimer(ITIMER_REAL, &timer, NULL);
    while(1) {
        pause();
    }

    return 0;
}

/*----------------------------------OUTPUT----------------------------------------------------------------
vumma@vumma-VivoBook-15-ASUS-Laptop-X507UF:~/Desktop/SS/HOL2$ ./1a
1 round : Mon Sep 29 12:33:10 2025

2 round : Mon Sep 29 12:33:20 2025

3 round : Mon Sep 29 12:33:30 2025
*/