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Diffstat (limited to 'modules/pam_filter/pam_filter.h')
-rw-r--r-- | modules/pam_filter/pam_filter.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/modules/pam_filter/pam_filter.h b/modules/pam_filter/pam_filter.h new file mode 100644 index 0000000..630198e --- /dev/null +++ b/modules/pam_filter/pam_filter.h @@ -0,0 +1,32 @@ +/* + * $Id$ + * + * 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 |