UDP_DEV_NAME
udpfd = open(UDP_DEV_NAME, O_RDWR | O_NONBLOCK, 0);
error("Couldn't open UDP device (%s): %m", UDP_DEV_NAME);
udp_dev_name = UDP_DEV_NAME;
Perror2("I_PLINK", UDP_DEV_NAME);
Perror2("I_PLINK", UDP_DEV_NAME);
udp_dev_name = UDP_DEV_NAME;
UDP_DEV_NAME, strerror(errno));
UDP_DEV_NAME, strerror(errno));
udp_dev_name = (af == AF_INET6 ? UDP6_DEV_NAME : UDP_DEV_NAME);
udp_dev_name = UDP_DEV_NAME;