#include <security/pam_ext.h>
| int
            pam_error( | pam_handle_t *pamh, | 
| const char *fmt, | |
| ... ); | 
| int
            pam_verror( | pam_handle_t *pamh, | 
| const char *fmt, | |
| va_list args ); | 
The pam_error function
      prints error messages through the conversation function to
      the user.
The pam_verror function
      performs the same task as pam_error() with the difference that it
      takes a set of arguments which have been obtained using the
      stdarg(3) variable argument
      list macros.
Memory buffer error.
Conversation failure.
Error message was displayed.
System error.
The pam_error and
      pam_verror functions are
      Linux-PAM extensions.
| 
                  See Linux-PAM copyright notice for more information.
                 |