int toSub[2], fromSub[2];
        if(!pipe(toSub)) return 1;
        if(!pipe(fromSub)) return 1;

        if( fork() )
        {
                while(1)
                {
                        if(!read(fromSub[0], &c, 1)) break;
                        send(sockfd, &c, 1, 0);

                        printf("in-%c\n", c);

                        if(!recv(sockfd, &c, 1, 0)) break;
                        send(toSub[1], &c, 1, 0);

                        printf("out-%c\n", c);
                }
        }
        else
        {
                dup2(toSub[0], 0);
                dup2(fromSub[1], 1);
                execlp("rz", "rz", (char*) NULL);
        }

        puts("done");