+/* sys enumeration */
+struct udev_enumerate;
+extern struct udev_enumerate *udev_enumerate_new(struct udev *udev);
+extern struct udev_enumerate *udev_enumerate_ref(struct udev_enumerate *udev_enumerate);
+extern void udev_enumerate_unref(struct udev_enumerate *udev_enumerate);
+extern struct udev *udev_enumerate_get_udev(struct udev_enumerate *udev_enumerate);
+extern int udev_enumerate_add_match_subsystem(struct udev_enumerate *udev_enumerate, const char *subsystem);
+extern int udev_enumerate_add_nomatch_subsystem(struct udev_enumerate *udev_enumerate, const char *subsystem);
+extern int udev_enumerate_add_match_sysattr(struct udev_enumerate *udev_enumerate, const char *sysattr, const char *value);
+extern int udev_enumerate_add_nomatch_sysattr(struct udev_enumerate *udev_enumerate, const char *sysattr, const char *value);
+extern int udev_enumerate_add_match_property(struct udev_enumerate *udev_enumerate, const char *property, const char *value);
+extern int udev_enumerate_add_syspath(struct udev_enumerate *udev_enumerate, const char *syspath);
+extern int udev_enumerate_scan_devices(struct udev_enumerate *udev_enumerate);
+extern int udev_enumerate_scan_subsystems(struct udev_enumerate *udev_enumerate);
+extern struct udev_list_entry *udev_enumerate_get_list_entry(struct udev_enumerate *udev_enumerate);
+
+/* event queue */
+struct udev_queue;
+extern struct udev_queue *udev_queue_new(struct udev *udev);
+extern struct udev_queue *udev_queue_ref(struct udev_queue *udev_queue);
+extern void udev_queue_unref(struct udev_queue *udev_queue);
+extern struct udev *udev_queue_get_udev(struct udev_queue *udev_queue);
+extern unsigned long long int udev_queue_get_kernel_seqnum(struct udev_queue *udev_queue);
+extern unsigned long long int udev_queue_get_udev_seqnum(struct udev_queue *udev_queue);
+extern int udev_queue_get_udev_is_active(struct udev_queue *udev_queue);
+extern int udev_queue_get_queue_is_empty(struct udev_queue *udev_queue);
+extern int udev_queue_get_seqnum_is_finished(struct udev_queue *udev_queue, unsigned long long int seqnum);
+extern struct udev_list_entry *udev_queue_get_queued_list_entry(struct udev_queue *udev_queue);
+extern struct udev_list_entry *udev_queue_get_failed_list_entry(struct udev_queue *udev_queue);