/*  Make the necessary includes and set up the variables.  */

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>

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

/*  Create an unnamed socket for the server.  */
    server_sockfd = socket(AF_INET, SOCK_STREAM, 0);

/*  Name the socket.  */
    server_address.sin_family = AF_INET;
    server_address.sin_addr.s_addr = inet_addr("127.0.0.1");
    server_address.sin_port = 2000;
    server_len = sizeof(server_address);
    bind(server_sockfd, (struct sockaddr *)&server_address, server_len);

/*  Create a connection queue and wait for clients.  */
    listen(server_sockfd, 5);
    while(1) {
        char ch;
        printf("server waiting\n");

/*  Accept a connection.  */
        client_len = sizeof(client_address);
        client_sockfd = accept(server_sockfd, (struct sockaddr *)&client_address, &client_len);

/*  We can now read/write to client on client_sockfd.  */
	     printf("llego un cliente!!!...\n");
        read(client_sockfd, &ch, 1);
        ch++;
        write(client_sockfd, &ch, 1);
        close(client_sockfd);
    }
}