sendip
err = sendip(nfd, ipbuf, sizeof(*eh) + iplen);
err = sendip(nfd, ipbuf, sizeof(*eh) + ts);
err = sendip(nfd, s, sizeof(*eh) + len);
extern int sendip(int, char *, int);
if (sendip(wfd, (char *)eh, len) == -1)
ssize_t sendip(struct iodesc *, void *, size_t, uint8_t);
cc = sendip(d, uh, len, IPPROTO_UDP);