add: struct sockaddr_in6 saddr; int err; static char hostname[NI_MAXHOST];
context: addr_to_host(const struct in6_addr *addr){#if 0	/* TODO: getipnodebyaddr missing */	struct hostent *host;	if ((host = getipnodebyaddr((char *) addr,				  sizeof(struct in6_addr), AF_INET6, NULL)) != NULL)		return (char *) host->h_name;	/*TODO: freehostent()*/#endif	return (char *) NULL;}