void interface_add_error(struct interface *iface, const char *subsystem,
const char *code, const char **data, int n_data);
void interface_add_error(struct interface *iface, const char *subsystem,
const char *code, const char **data, int n_data);
void interface_update_start(struct interface *iface);
void interface_update_complete(struct interface *iface);
void interface_update_start(struct interface *iface);
void interface_update_complete(struct interface *iface);