sendpacket
error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1));
(void)sendpacket(sin6, RIPSIZE(nn));
static int sendpacket(struct sockaddr_in6 *, int);
error = sendpacket(sin6, RIPSIZE(nrt));
(void)sendpacket(probesock, &dst, ifindex, 1, NULL, 0);
n = sendpacket(rssock, &dst, ifindex, 255, data, len);