Function setdefif

tools/ndp/ndp.c:1377–1401

XXX: check SIOCGDEFIFACE_IN6 as well? */

#ifdef SIOCSDEFIFACE_IN6	/* XXX: check SIOCGDEFIFACE_IN6 as well? */
static void
setdefif(char *ifname)
{
	struct in6_ndifreq ndifreq;
	unsigned int ifindex;
	int sock;

	if (strcasecmp(ifname, "delete") == 0)
		ifindex = 0;
	else {
		if ((ifindex = if_nametoindex(ifname)) == 0)
			err(1, "failed to resolve i/f index for %s", ifname);
	}

	if ((sock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
		err(1, "socket");

	strlcpy(ndifreq.ifname, "lo0", sizeof(ndifreq.ifname)); /* dummy */
	ndifreq.ifindex = ifindex;

	if (ioctl(sock, SIOCSDEFIFACE_IN6, (caddr_t)&ndifreq) < 0)
		err(1, "ioctl(SIOCSDEFIFACE_IN6)");

	close(sock);
}

static void
getdefif()