Program without SIGINT signal interruption

Question

I’m trying to write a program that stays on an infinite loop, and can’t be stopped by the SIGINT( C signal on the keyboard).

What I have so far is the following code:

void sigint();

int main()
{
    int pid;
    pid = fork();

    if(pid == -1)
    {
        perror("fork");
        exit(1);
    }
    if(pid == 0)
    {
        signal(SIGINT, SIG_IGN);
    }
    else
    {
        sleep(3);
        printf("\nPARENT: sending SIGINT\n\n");
        kill(pid,SIGINT);
    }
    void sigint()
    { while(1);}

Answer 1

A very simple implementation of how to capture SIGINT (Ctrl+c) would be like this:

#include <stdio.h>
#include <unistd.h>
#include <signal.h>

void sigHandler(int sig)
{
    printf("SIGINT!\n");
}

int main()
{
    signal(SIGINT, sigHandler);

    while(1)
        usleep(100000);

    return 0;
}

Each time you press Ctrl+c you will call the function sigHandler. From this small example you can apply in its context with want.