familyname
fprintf(stderr, " %s", familyname(hint->ai_family, buf,
fprintf(stderr, " ai_family=%s", familyname(ai->ai_family, buf,
familyname(ai->ai_addr->sa_family, buf, sizeof(buf)));
extern const char *familyname(const int);
PRINTF("%s", familyname(node->ipn_addr.adf_family));
PRINTF("%s", familyname(node->ipe_family));
PRINTF("%s", familyname(a->adf_family));