c_g_dbus_object_manager_client_new_for_bus

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(GBusType busType, GDBusObjectManagerClientFlags flags, gchar* name, gchar* objectPath, GDBusProxyTypeFunc getProxyTypeFunc, void* getProxyTypeUserData, GDestroyNotify getProxyTypeDestroyNotify, GCancellable* cancellable, GAsyncReadyCallback callback, void* userData) c_g_dbus_object_manager_client_new_for_bus;

Meta