+#define UDEVD_SOCK_PATH "/org/kernel/udev/udevd"
+#define UDEVSEND_WAIT_MAX_SECONDS 3
+#define UDEVSEND_WAIT_LOOP_PER_SECOND 10
+
+#define UDEVD_PRIORITY -4
+#define UDEV_PRIORITY -2
+
+#define EVENT_QUEUE_DIR ".udev/queue"
+#define EVENT_FAILED_DIR ".udev/failed"
+
+/* maximum limit of runnig childs */
+#define UDEVD_MAX_CHILDS 64
+/* start to throttle forking if maximum number of running childs in our session is reached */
+#define UDEVD_MAX_CHILDS_RUNNING 16
+
+/* environment buffer, should match the kernel's size in lib/kobject_uevent.h */
+#define UEVENT_BUFFER_SIZE 1024
+#define UEVENT_NUM_ENVP 32
+
+enum udevd_msg_type {
+ UDEVD_UNKNOWN,
+ UDEVD_UEVENT_UDEVSEND,
+ UDEVD_UEVENT_INITSEND,
+ UDEVD_UEVENT_NETLINK,
+ UDEVD_STOP_EXEC_QUEUE,
+ UDEVD_START_EXEC_QUEUE,
+ UDEVD_SET_LOG_LEVEL,
+ UDEVD_SET_MAX_CHILDS,
+ UDEVD_RELOAD_RULES,
+};
+
+
+struct udevd_msg {
+ char magic[32];
+ enum udevd_msg_type type;
+ char envbuf[UEVENT_BUFFER_SIZE+512];
+};