UDEV_CTRL_PING    318 src/udev/udev-ctrl.c         return ctrl_send(uctrl, UDEV_CTRL_PING, 0, NULL, timeout);
UDEV_CTRL_PING    452 src/udev/udev-ctrl.c         if (ctrl_msg->ctrl_msg_wire.type == UDEV_CTRL_PING)