+/* duration of initialization phase with shorter timeout */
+#define INIT_TIME_SEC 5
+#define EVENT_INIT_TIMEOUT_SEC 2
+
+/* timeout to wait for missing events */
+#define EVENT_TIMEOUT_SEC 10
+
+/* start to throttle forking if maximum number of running childs in our session is reached */
+#define THROTTLE_MAX_RUNNING_CHILDS 10
+
+/* environment buffer, should match the kernel's size in lib/kobject_uevent.h */
+#define HOTPLUG_BUFFER_SIZE 1024
+#define HOTPLUG_NUM_ENVP 32
+
+struct udevsend_msg {