server.sin_port = htons(USERPORT);

       server.sin_addr.s_addr = INADDR_ANY;

       if (bind(s, (struct sockaddr *)&server, sizeof(server))<0)

       {

              perror("Bind()");

              return;

       }

       if (listen(s,1)!=0)

       {

              perror("Listen()");

              return;

       }

       namelen = sizeof(client);