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

void *child_thread(void *arg) {
    sigset_t set;
    int sig;

    sigemptyset(&set);
    sigaddset(&set, SIGINT);
    sigaddset(&set, SIGTERM);

    if (pthread_sigmask(SIG_BLOCK, &set, NULL) != 0) {
        perror("pthread_sigmask");
        return NULL;
    }

    if (sigwait(&set, &sig) != 0) {
        perror("sigwait");
        return NULL;
    }

    printf("Otrzymano sygnal: %d\n", sig);

    pthread_exit(NULL);
}

int main() {
    pthread_t thread;
    sigset_t set;

    sigemptyset(&set);
    sigaddset(&set, SIGINT);
    sigaddset(&set, SIGTERM);

    if (pthread_sigmask(SIG_BLOCK, &set, NULL) != 0) {
        perror("pthread_sigmask");
        return EXIT_FAILURE;
    }

    if (pthread_create(&thread, NULL, child_thread, NULL) != 0) {
        perror("pthread_create");
        return EXIT_FAILURE;
    }

    if (pthread_join(thread, NULL) != 0) {
        perror("pthread_join");
        return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
}