Returns the current authentication token, or the new token when changing authentication tokens.
Returns the previous authentication token when changing authentication tokens.
The prompt argument specifies a prompt to use if no token is cached. If it is NULL, the PAM_AUTHTOK_PROMPT or PAM_OLDAUTHTOK_PROMPT item, as appropriate, will be used. If that item is also NULL, a hardcoded default prompt will be used.
If item is set to PAM_AUTHTOK and there is a non-null PAM_OLDAUTHTOK item, pam_get_authtok will ask the user to confirm the new token by retyping it. If there is a mismatch, pam_get_authtok will return PAM_TRY_AGAIN.