# define dbg(udev, arg...) udev_log(udev, LOG_DEBUG, __FILE__, __LINE__, __FUNCTION__, ## arg)
# else
# define dbg(udev, arg...) log_null(udev, ## arg)
# define dbg(udev, arg...) udev_log(udev, LOG_DEBUG, __FILE__, __LINE__, __FUNCTION__, ## arg)
# else
# define dbg(udev, arg...) log_null(udev, ## arg)