udev_ctrl_send_set_env  125 src/udev/udev.h int udev_ctrl_send_set_env(struct udev_ctrl *uctrl, const char *key, int timeout);
udev_ctrl_send_set_env  118 src/udev/udevadm-control.c                         if (udev_ctrl_send_set_env(uctrl, optarg, timeout) < 0)