extern void freeaddrinfo (struct addrinfo *);
extern void freehostent (struct hostent *);
-extern char *gai_strerror (int);
-extern int getaddrinfo (const char *, const char *,
- const struct addrinfo *, struct addrinfo **);
extern int getnameinfo (const struct sockaddr *, size_t, char *,
size_t, char *, size_t, int);
extern struct hostent *getipnodebyaddr (const void *, size_t, int, int *);