extern const char *udev_device_get_subsystem(struct udev_device *udev_device);
extern const char *udev_device_get_syspath(struct udev_device *udev_device);
extern const char *udev_device_get_sysname(struct udev_device *udev_device);
+extern const char *udev_device_get_sysnum(struct udev_device *udev_device);
extern const char *udev_device_get_devnode(struct udev_device *udev_device);
extern struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device);
extern struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device);