[...]
 static struct libwebsocket_protocols protocols[] = {
   {
     "my_protocol",                   /* protocol name */
     my_callback,                     /* callback */
     sizeof(struct per_session_data)  /* max frame size / rx buffer */
   },
   {
     NULL, NULL, 0
   }
 };
 [...]

 struct lws_context_creation_info info;
 [...]
 memset (&info, 0, sizeof info);
 info.port = 8080;
 info.iface = NULL;
 info.protocols = protocols;
 info.extensions = libwebsocket_get_internal_extensions();
 info.gid = -1;
 info.uid = -1;
 info.options = 0;
 info.ssl_cert_filepath = NULL;
 info.ssl_private_key_filepath = NULL;
 [...]

 static struct libwebsocket_context *context;

 context = libwebsocket_create_context (&info);
 if (context == NULL)
   {
     print_log (LOG_ERR, "(main) libwebsocket context init failed\n");
     goto out;
   }
 [...]