晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/security/pam_filter.h
/*
 * $Id$
 *
 * 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

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