sendether
return sendether(d, pkt, len, bcea, ETHERTYPE_ARP);
(void) sendether(d, pkt, sizeof(*arp) + 18,
return sendether(d, ip, len, ea, ETHERTYPE_IP);
ssize_t sendether(struct iodesc *, void *, size_t, u_char *, int);
return sendether(d, pkt, len, bcea, ETHERTYPE_REVARP);