+/* libudev */
+extern struct udev_device *device_init(struct udev *udev);
+
+/* libudev-device */
+extern int device_set_devpath(struct udev_device *udev_device, const char *devpath);
+extern int device_set_subsystem(struct udev_device *udev_device, const char *subsystem);
+extern int device_set_devname(struct udev_device *udev_device, const char *devname);
+extern int device_add_devlink(struct udev_device *udev_device, const char *devlink);
+extern int device_add_property(struct udev_device *udev_device, const char *property);
+
+/* libudev-utils */
+extern ssize_t util_get_sys_subsystem(struct udev *udev, const char *devpath, char *subsystem, size_t size);