int manager_add_device(Manager *m, const char *sysfs, bool master, Device **_device);
int manager_add_button(Manager *m, const char *name, Button **_button);
int manager_add_seat(Manager *m, const char *id, Seat **_seat);
int manager_add_device(Manager *m, const char *sysfs, bool master, Device **_device);
int manager_add_button(Manager *m, const char *name, Button **_button);
int manager_add_seat(Manager *m, const char *id, Seat **_seat);
int manager_process_seat_device(Manager *m, struct udev_device *d);
int manager_process_button_device(Manager *m, struct udev_device *d);
int manager_process_seat_device(Manager *m, struct udev_device *d);
int manager_process_button_device(Manager *m, struct udev_device *d);