Signature for callback function used in
snapd_client_connect_interface_sync(),
snapd_client_disconnect_interface_async(),
snapd_client_install2_sync(),
snapd_client_refresh_sync(),
snapd_client_remove2_sync(),
snapd_client_enable_sync() and
snapd_client_disable_sync().
Signature for callback function used in snapd_client_connect_interface_sync(), snapd_client_disconnect_interface_async(), snapd_client_install2_sync(), snapd_client_refresh_sync(), snapd_client_remove2_sync(), snapd_client_enable_sync() and snapd_client_disable_sync().