CS452 Lab03 - fork() and signal()

lab03_c.c

#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <stdbool.h>
#include <sys/types.h>
#include <sys/wait.h>

bool running = true;

void sigHandler(int number) {
    printf ("Signal handler of process %d\n", getpid());
    running = false;
}

int main() {
    struct sigaction my_action;
    my_action.sa_handler = sigHandler;
    sigemptyset(&my_action.sa_mask);
    sigaction(SIGUSR1, &my_action, NULL);
    
    pid_t who = fork();
    if (who == 0) {
        while (running) {
           printf ("I'm the child PID:%d, my parent is %d\n", getpid(), getppid());
           sleep(2);
        }
        printf ("Out of the child loop\n");
        return 73;
    }
    else {
        int code;
        while (running) {
           printf ("I'm the parent PID:%d\n", getpid());
           sleep(1);
        }
        printf ("out of the parent loop\n");
        wait(&code);
        printf ("Child exit code is %d\n", WEXITSTATUS(code));
    }
    printf ("Out of main()\n");
}