Sistemi operativi

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

 //PIN e POUT sono altri nomi delle pipe
#define POUT "carPipeOut"
#define PIN "carPipeIn"

int main(){
    int round,fdin,fdout,bytesread,hole,car;
    char message[100];
    char answer[8];

    mkfifo(POUT,0666);
    mkfifo(PIN,0666);

    if ( (fdout = open (POUT,O_RDONLY)) < 0 ) { // apre la pipe in lettura
        perror("errore apertura pipe");
        exit(1);
    }
    if ( (fdin = open (PIN,O_WRONLY)) < 0 ) { // apre la pipe in lettura
        perror("errore apertura pipe");
        exit(1);
    }

    car=7;



    for(round=0;round<=20;round++){
        printf("*************\nround %d! Start!\n",round+1);
        strcpy(answer, "");


        bytesread = read(fdout,message,100);
        printf("Ho letto %d caratteri: %s\n",bytesread,message);


        sscanf(message,"%d#",&hole);

        while(hole!=car){

            if(hole<car){strcat(answer,"l"); car--;}
            else{strcat(answer,"r"); car++;}

        }
        printf("Scrivo %s\n",answer);
        write (fdin,answer,strlen(answer));



    }

    close(fdin); close(fdout);
    return 0;
}