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

volatile sig_atomic_t sigint_count = 3;

void sigint_action(int signum, siginfo_t *info, void *ctx)
{
        printf("sigint_handler(%d): sigint_count(%d) signum(%d) code(0x%x)\n",
               signum, sigint_count, info->si_signo, info->si_code);

        if (--sigint_count <= 0) {
                printf("sigint_handler: exiting ...\n");
                exit(1);
        }
}

int main(void)
{
        struct sigaction sa_sigint;

        memset(&sa_sigint, 0, sizeof(sa_sigint));
        sa_sigint.sa_sigaction = sigint_action;
        sa_sigint.sa_flags = SA_RESTART | SA_SIGINFO;

        if (sigaction(SIGINT, &sa_sigint, NULL) < 0) {
                perror("sigaction");
                exit(1);
        }

        while (1) {
                printf("main: sigint_count(%d), calling pause ...\n",
                       sigint_count);

                pause();

                printf("main: returned from pause. sigint_count(%d)\n",
                       sigint_count);
        }

        return 0;
}