const char *hstrerror(int);
struct hostent *gethostbyname (const char *);
int gethostbyname_r(const char *, struct hostent *, char *, size_t, struct hostent **, int *);
const char *hstrerror(int);
struct hostent *gethostbyname (const char *);
int gethostbyname_r(const char *, struct hostent *, char *, size_t, struct hostent **, int *);