PIPE

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

int main(){
    char name[256];
    int pipePW[2], pipeCW[2], pid;

    if (pipe(pipePW) < 0)
        perror("Błąd PIPE\n");
    if (pipe(pipeCW) < 0)
        perror("Błąd PIPE\n");

    pid = fork();
    if (pid == -1){
        perror("Błąd forkowania\n");
        exit(1);
        }
    if (pid == 0){
        close(pipePW[1]);
        close(pipeCW[0]);
        char buff[20] = "";
        char status;
        FILE* file;
        read(pipePW[0],&name,sizeof(name));

        if ((file = fopen(name,"r")) == NULL){
            status = -1;
            write(pipeCW[1],&status,1);
            exit(1);
            }
        do {
            status = fread(&buff,1,20,file);
            write(pipeCW[1],&status,1);
            write(pipeCW[1],&buff,status);
            } while (status != 0);
        exit(0);
        }
    else {
        close(pipePW[0]);
        close(pipeCW[1]);
        char buff[20] = "";
        char size;

        puts("Podaj nazwę pliku do wczytania");
        scanf("%s",name);
        write(pipePW[1],&name,sizeof(name));

        do {
            read(pipeCW[0],&size,1);
            if (size == -1){
                puts("Problem z plikiem");
                wait(NULL);
                exit(-1);
            }
            if (size == 0)
                break;
            read(pipeCW[0],&buff,size);
            printf("%s",buff);
            buff[0] = '\0';
        } while(size != 0);
        wait(NULL);
        }

    return 0;
}