realhostname_sa
if (realhostname_sa(realname, sizeof(realname),
int realhostname_sa(char *, size_t, struct sockaddr *, int);
realhostname_sa(rhost, sizeof rhost - 1,
realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len);
realhostname_sa(ut.ut_host, sizeof(ut.ut_host),
if (realhostname_sa(remote_hostname, sizeof(remote_hostname) - 1,