const char *bus_errno_to_dbus(int error);
DBusMessage* bus_properties_changed_new(const char *path, const char *interface, const char *properties);
+DBusMessage* bus_properties_changed_one_new(const char *path, const char *interface, const char *property);
uint32_t bus_flags_to_events(DBusWatch *bus_watch);
unsigned bus_events_to_flags(uint32_t events);