server_sock->listen(*addr);
event_disp.add(*server_sock);
server_sock->signal_data_available.connect(sigc::mem_fun(this, &NetCat::net_data_available));
server_sock->listen(*addr);
event_disp.add(*server_sock);
server_sock->signal_data_available.connect(sigc::mem_fun(this, &NetCat::net_data_available));