LAB7_Zad2

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

// __pid_t to tak naprawde typedef int czyli można spokojnie dać
// int m, p1, p2;
__pid_t m, p1, p2;

void handler_proc2(int signal)
{
    printf("\nPID: %d | Name of signal: %s | Signal number: %d\n", p2, strsignal(signal), signal);
    fflush(stdout);

    if (signal == SIGINT)
        kill(m, signal);
}

void handler_main(int signal)
{
    if (signal == SIGINT)
    {
        kill(p1, SIGKILL);
        kill(p2, SIGKILL);
        kill(m, SIGKILL);
    }
}

int main()
{
    m = getpid();
    printf("Main PID: %d\n", m);

    if (fork() == 0)
    {
        p1 = getpid();
        printf("Process1 PID: %d\n", p1);

        sigset_t mask;
        sigfillset(&mask);
        sigprocmask(SIG_SETMASK, &mask, NULL);

        // while(1) mozna zastapic tym: for(;;)
        while(1)
        {
            fprintf(stderr, "!");
            fflush(stderr);
            sleep(5);
        }
    }

    if (fork() == 0)
    {
        p2 = getpid();
        printf("Process2 PID: %d\n", p2);

        for (int i = 0; i < _NSIG; i++)
            signal(i, handler_proc2);

        while (1)
            pause();
    }

    sigset_t maska;
    sigfillset(&maska);
    sigdelset(&maska, SIGINT);
    sigprocmask(SIG_SETMASK, &maska, NULL);

    signal(SIGINT, handler_main);

    while (1)
        pause();
}