-extern struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath);
-extern struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum);
-extern struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname);
-extern struct udev_device *udev_device_get_parent(struct udev_device *udev_device);
-extern struct udev_device *udev_device_get_parent_with_subsystem(struct udev_device *udev_device, const char *subsystem);
-extern struct udev_device *udev_device_ref(struct udev_device *udev_device);
-extern void udev_device_unref(struct udev_device *udev_device);
-extern struct udev *udev_device_get_udev(struct udev_device *udev_device);
-extern const char *udev_device_get_devpath(struct udev_device *udev_device);
-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);
-extern const char *udev_device_get_driver(struct udev_device *udev_device);
-extern dev_t udev_device_get_devnum(struct udev_device *udev_device);
-extern const char *udev_device_get_action(struct udev_device *udev_device);
-extern unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device);
-extern const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr);
+struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath);
+struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum);
+struct udev_device *udev_device_new_from_subsystem_sysname(struct udev *udev, const char *subsystem, const char *sysname);
+struct udev_device *udev_device_get_parent(struct udev_device *udev_device);
+struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device, const char *subsystem, const char *devtype);
+struct udev_device *udev_device_ref(struct udev_device *udev_device);
+void udev_device_unref(struct udev_device *udev_device);
+struct udev *udev_device_get_udev(struct udev_device *udev_device);
+const char *udev_device_get_devpath(struct udev_device *udev_device);
+const char *udev_device_get_subsystem(struct udev_device *udev_device);
+const char *udev_device_get_devtype(struct udev_device *udev_device);
+const char *udev_device_get_syspath(struct udev_device *udev_device);
+const char *udev_device_get_sysname(struct udev_device *udev_device);
+const char *udev_device_get_sysnum(struct udev_device *udev_device);
+const char *udev_device_get_devnode(struct udev_device *udev_device);
+struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev_device *udev_device);
+struct udev_list_entry *udev_device_get_properties_list_entry(struct udev_device *udev_device);
+const char *udev_device_get_property_value(struct udev_device *udev_device, const char *key);
+const char *udev_device_get_driver(struct udev_device *udev_device);
+dev_t udev_device_get_devnum(struct udev_device *udev_device);
+const char *udev_device_get_action(struct udev_device *udev_device);
+unsigned long long int udev_device_get_seqnum(struct udev_device *udev_device);
+const char *udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr);