Function auth_userresponse 

pub unsafe extern "C" fn auth_userresponse(
    _as: *mut auth_session_t,
    _response: *mut c_char,
    _more: c_int,
) -> c_int

Complete the challenge-response authentication initiated by auth_userchallenge

Closes the BSD Authentication session

From authenticate(3):

The user should provide a password which is the `response`. In addition to the password,
the pointer returned `auth_userchallenge()` shoud be passed in as `as` and the value of
`more` should be non-zero if the program wishes to allow more attempts. If `more` is zero
then the session will be closed. The `auth_userresponse()` function closes the BSD
Authentication session and has the same return value as `auth_userokay()`. For security
reasons, when a `response` is specified, `auth_userresponse()` will zero out its value
before it returns.