extern const sd_bus_vtable manager_vtable[];
-int machine_node_enumerator(sd_bus *bus, const char *path, char ***nodes, void *userdata);
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int match_reloading(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error);
int match_unit_removed(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error);
int match_properties_changed(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error);