Lab6

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <semaphore.h>
#include <fcntl.h>

#define BUFFER_SIZE 100

int main() {
    int angel_to_ahrdie[2], ahrdie_to_angel[2];
    pid_t pid;
    char buffer[BUFFER_SIZE];

    if (pipe(angel_to_ahrdie) == -1 || pipe(ahrdie_to_angel) == -1) {
        perror("🚨 Pipe creation failed");
        exit(1);
    }
    sem_t *sem_angel_turn = sem_open("/sem_angel_turn", O_CREAT | O_EXCL, 0644, 1);
    sem_t *sem_ahrdie_turn = sem_open("/sem_ahrdie_turn", O_CREAT | O_EXCL, 0644, 0);

    if (sem_angel_turn == SEM_FAILED || sem_ahrdie_turn == SEM_FAILED) {
        perror("🚨 Semaphore creation failed");
        exit(1);
    }

    pid = fork();
    if (pid < 0) {
        perror("🚨 Fork failed");
        exit(1);
    }

    if (pid == 0) {
        close(angel_to_ahrdie[1]);
        close(ahrdie_to_angel[0]);
        while (1) {
            sem_wait(sem_ahrdie_turn);
            read(angel_to_ahrdie[0], buffer, BUFFER_SIZE);
            printf("😇 Angel: %s", buffer);
            if (strncmp(buffer, "exit", 4) == 0) {
                break;
            }
            printf("😎 Ahrdie: ");
            fgets(buffer, BUFFER_SIZE, stdin);
            write(ahrdie_to_angel[1], buffer, strlen(buffer) + 1);
            sem_post(sem_angel_turn);
        }
        close(angel_to_ahrdie[0]);
        close(ahrdie_to_angel[1]);
        sem_close(sem_angel_turn);
        sem_close(sem_ahrdie_turn);
        exit(0);
    } else {
        close(angel_to_ahrdie[0]);
        close(ahrdie_to_angel[1]);
        while (1) {
            sem_wait(sem_angel_turn);
            printf("😇 Angel: ");
            fgets(buffer, BUFFER_SIZE, stdin);
            write(angel_to_ahrdie[1], buffer, strlen(buffer) + 1);
            if (strncmp(buffer, "exit", 4) == 0) {
                break;
            }
            sem_post(sem_ahrdie_turn);
            read(ahrdie_to_angel[0], buffer, BUFFER_SIZE);
            printf("😎 Ahrdie: %s", buffer);
        }
        close(angel_to_ahrdie[1]);
        close(ahrdie_to_angel[0]);
        sem_close(sem_angel_turn);
        sem_close(sem_ahrdie_turn);
        sem_unlink("/sem_angel_turn");
        sem_unlink("/sem_ahrdie_turn");

        wait(NULL);
    }
    return 0;
}