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/*
 * $Id: pam_filter.h,v 1.1 2005/08/16 12:27:42 kukuk Exp $
 *
 * this file is associated with the Linux-PAM filter module.
 * it was written by Andrew G. Morgan <morgan@linux.kernel.org>
 *
 */

#ifndef PAM_FILTER_H
#define PAM_FILTER_H

#include <sys/file.h>

/*
 * this will fail if there is some problem with these file descriptors
 * being allocated by the pam_filter Linux-PAM module. The numbers
 * here are thought safe, but the filter developer should use the
 * macros, as these numbers are subject to change.
 *
 * The APPXXX_FILENO file descriptors are the STDIN/OUT/ERR_FILENO of the
 * application. The filter uses the STDIN/OUT/ERR_FILENO's to converse
 * with the user, passes (modified) user input to the application via
 * APPIN_FILENO, and receives application output from APPOUT_FILENO/ERR.
 */

#define APPIN_FILENO    3           /* write here to give application input */
#define APPOUT_FILENO   4           /* read here to get application output */
#define APPERR_FILENO   5           /* read here to get application errors */

#define APPTOP_FILE   6                                  /* used by select */

#endif

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