int nfs_callback_address(const struct sockaddr *, const socklen_t,
struct sockaddr *, socklen_t *);
int nfs_call_umount(clnt_addr_t *, dirpath *);
int nfs_callback_address(const struct sockaddr *, const socklen_t,
struct sockaddr *, socklen_t *);
int nfs_call_umount(clnt_addr_t *, dirpath *);