// Process signals received either from the keyboard or from another process

#include <unistd.h>

#include <signal.h>

#include <stdio.h>

#include <stdlib.h>

void handler(int sig) {

    printf("Caught signal %d\n", sig);

    char c;

    printf("Are you sure you want to quit? [y/n]\n");

    scanf("%c", &c);

    if(c == 'y')

        exit(0);

}



int main(int argc, char *argv[]) {

    signal(SIGINT, handler);

    signal(SIGUSR1, handler);

    while(1) {

        printf("Staying alive...\n");

        usleep(100 * 1000);

    }

    return 0;

}