extern struct udev *udev_monitor_get_udev(struct udev_monitor *udev_monitor);
extern int udev_monitor_get_fd(struct udev_monitor *udev_monitor);
extern struct udev_device *udev_monitor_receive_device(struct udev_monitor *udev_monitor);
-extern int udev_monitor_filter_add_match_subsystem(struct udev_monitor *udev_monitor, const char *subsystem);
+extern int udev_monitor_filter_add_match_subsystem_devtype(struct udev_monitor *udev_monitor, const char *subsystem, const char *devtype);
+extern int udev_monitor_filter_update(struct udev_monitor *udev_monitor);
+extern int udev_monitor_filter_remove(struct udev_monitor *udev_monitor);
/* sys enumeration */
struct udev_enumerate;