Function safe_authenticator::ffi::login

#[no_mangle]
pub unsafe extern "C" fn login(
    account_locator: *const c_char, 
    account_password: *const c_char, 
    user_data: *mut c_void, 
    o_disconnect_notifier_cb: unsafe extern "C" fn(_: *mut c_void), 
    o_cb: extern "C" fn(_: *mut c_void, _: *const FfiResult, _: *mut Authenticator)
)

Log into a registered account. This or any one of the other companion functions to get an authenticator instance must be called before initiating any operation allowed for authenticator. The user_data parameter corresponds to the first parameter of the o_cb and o_disconnect_notifier_cb callbacks.

Callback parameters: user data, error code, authenticator