Legacy behavior (comparable to previous versions of QNX).
Syntax:
facility control_flag pam_qnx.so [debug] [nullok] 
    [try_first_pass] [use_first_pass]
Options:
- debug
                    
- Write a LOG_DEBUG message to the system log. 
- nullok
        
- Accept a blank password.
- try_first_pass
                    
- Prompt for a password only if the password from the previous auth module is empty or fails.
- use_first_pass
        
- Fail if the password from the previous
            auth module is empty or fails. Do not
            prompt.
Description:
Use the pam_qnx module for authentication behavior that is comparable to
                previous versions of QNX. 
    Note: The PAM module syntax does not stand alone and is contained within the context of the PAM
                configuration command. See the 
Security
                    Developer's Guide for more information about system authentication,
                configuring PAM, facilities, control flags, examples, and how QNX Neutrino uses the OpenPAM framework. 
 
Service category:
        This module belongs to all of the PAM service categories:
    
        - auth
- account
- session
- password
Exit status:
Always returns failure.