+ * @param msg the request message
+ */
+void
+GAS_handle_request_address_cancel (struct GNUNET_SERVICE_Client *client,
+ const struct RequestAddressMessage *msg);
+
+
+/**
+ * Unregister a client (which may have been a connectivity client,
+ * but this is not assured).
+ *
+ * @param client handle of the (now dead) client
+ */
+void
+GAS_connectivity_remove_client (struct GNUNET_SERVICE_Client *client);
+
+
+/**
+ * Initialize connectivity subsystem.
+ */
+void
+GAS_connectivity_init (void);
+
+
+/**
+ * Shutdown connectivity subsystem.