S01_LAB02_08a

/*
Stwórz programy do dialogu mi ę dzy dwoma u ż ytkownikami w systemie. Do
komunikacji u ż yj łą cza FIFO stworzonego za pomoc ą funkcji mknod.
*/

// Program pierwszy

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <stdbool.h>

#define BUFFER_SIZE 256
#define SEND_FIFO_DIR "./send_fifo"
#define RECV_FIFO_DIR "./recv_fifo"

int send_fd, recv_fd;

void sigint_handler(int signum)
{
    if((close(send_fd) == -1) || (close(recv_fd) == -1)){
        perror("close");
        exit(EXIT_FAILURE);
    }

    if((unlink(SEND_FIFO_DIR) == -1) || (unlink(RECV_FIFO_DIR))){
        perror("unlink");
        exit(EXIT_FAILURE);
    }

    printf("\n");

    exit(EXIT_SUCCESS);
}

int main(void)
{
    char buffer[BUFFER_SIZE];
    bool send_recv_order = true;

    if(signal(SIGINT, sigint_handler) == SIG_ERR){
        perror("signal");
        return EXIT_FAILURE;
    }

    if((mknod(SEND_FIFO_DIR, S_IFIFO | 0600, 0) == -1) || mknod(RECV_FIFO_DIR, S_IFIFO | 0600, 0)){
        perror("mknod");
        return EXIT_FAILURE;
    }

    printf("Oczekiwanie na drugiego uzytkownika...\n");
    if((send_fd = open(SEND_FIFO_DIR, O_WRONLY)) == -1){
        perror("open");
        return EXIT_FAILURE;
    }
    if((recv_fd = open(RECV_FIFO_DIR, O_RDONLY)) == -1){
        perror("open");
        return EXIT_FAILURE;
    }

    while(1){
        if(send_recv_order){
            printf("> ");
            memset(buffer, '\0', BUFFER_SIZE);
            fgets(buffer, BUFFER_SIZE, stdin);

            if(write(send_fd, buffer, BUFFER_SIZE) == -1){
                perror("write");
                return EXIT_FAILURE;
            }
        }
        else{
            memset(buffer, '\0', BUFFER_SIZE);
            if(read(recv_fd, buffer, BUFFER_SIZE) == -1){
                perror("read");
                return EXIT_FAILURE;
            }

            printf("< %s\n", buffer);
        }
        send_recv_order = !send_recv_order;
    }

    if((close(send_fd) == -1) || (close(recv_fd) == -1)){
        perror("close");
        return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
}