/* includes y variables necesarias.  */
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <sys/un.h>
#include <unistd.h>
#include <stdlib.h>

int main()
{
    int server_sockfd, client_sockfd;
    int server_len, client_len;
    struct sockaddr_un server_address;
    struct sockaddr_un client_address;

/*  Sacar antiguos sockets (si los hay) y crear uno en el servidor.  */
    unlink("server_socket");
    server_sockfd = socket(AF_UNIX, SOCK_STREAM, 0);

/*  Nombrar el socket.  */
    server_address.sun_family = AF_UNIX;
    strcpy(server_address.sun_path, "server_socket");
    server_len = sizeof(server_address);
    bind(server_sockfd, (struct sockaddr *)&server_address, server_len);

/*  Crear una cola de conexiones y esperar a clientes.  */
    listen(server_sockfd, 5);
    while(1) {
        char ch;
		printf("servidor esperando...\n");

/*  Aceptar la conexion.  */
        client_len = sizeof(client_address);
        client_sockfd = accept(server_sockfd, (struct sockaddr *)&client_address, &client_len);

/*  Ahora se puede We can now read/write to client on client_sockfd.  */
	     printf("llego un cliente!!!...\n");
        read(client_sockfd, &ch, 1);	//lee char del cliente
        ch++;
        write(client_sockfd, &ch, 1);	//envia char al cliente
        close(client_sockfd);
    }
}