_gethostbyname
he = _gethostbyname(&argp->h_errno, argp->key.name);
struct hostent *_gethostbyname(int *h_errnop, const char *name);
he = _gethostbyname(&argp->h_errno, argp->key.ipnode.name);
extern struct hostent *_gethostbyname(int *, const char *);