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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/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

/*
 *	POSIX Standard: 9.2.1 Group Database Access	<grp.h>
 */

#ifndef	_GRP_H
#define	_GRP_H	1

#include <features.h>

__BEGIN_DECLS

#include <bits/types.h>

#define __need_size_t
#include <stddef.h>


/* For the Single Unix specification we must define this type here.  */
#if (defined __USE_XOPEN || defined __USE_XOPEN2K) && !defined __gid_t_defined
typedef __gid_t gid_t;
# define __gid_t_defined
#endif

/* The group structure.	 */
struct group
  {
    char *gr_name;		/* Group name.	*/
    char *gr_passwd;		/* Password.	*/
    __gid_t gr_gid;		/* Group ID.	*/
    char **gr_mem;		/* Member list.	*/
  };


#ifdef __USE_MISC
# include <bits/types/FILE.h>
#endif


#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
/* Rewind the group-file stream.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern void setgrent (void);

/* Close the group-file stream.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern void endgrent (void);

/* Read an entry from the group-file stream, opening it if necessary.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct group *getgrent (void);
#endif

#ifdef	__USE_MISC
/* Read a group entry from STREAM.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern struct group *fgetgrent (FILE *__stream);
#endif

#ifdef __USE_GNU
/* Write the given entry onto the given stream.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int putgrent (const struct group *__restrict __p,
		     FILE *__restrict __f);
#endif

/* Search for an entry with a matching group ID.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct group *getgrgid (__gid_t __gid);

/* Search for an entry with a matching group name.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern struct group *getgrnam (const char *__name);

#ifdef __USE_POSIX

# ifdef __USE_MISC
/* Reasonable value for the buffer sized used in the reentrant
   functions below.  But better use `sysconf'.  */
#  define NSS_BUFLEN_GROUP	1024
# endif

/* Reentrant versions of some of the functions above.

   PLEASE NOTE: the `getgrent_r' function is not (yet) standardized.
   The interface may change in later versions of this library.  But
   the interface is designed following the principals used for the
   other reentrant functions so the chances are good this is what the
   POSIX people would choose.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */

# ifdef __USE_GNU
extern int getgrent_r (struct group *__restrict __resultbuf,
		       char *__restrict __buffer, size_t __buflen,
		       struct group **__restrict __result);
# endif

/* Search for an entry with a matching group ID.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern int getgrgid_r (__gid_t __gid, struct group *__restrict __resultbuf,
		       char *__restrict __buffer, size_t __buflen,
		       struct group **__restrict __result);

/* Search for an entry with a matching group name.

   This function is a possible cancellation point and therefore not
   marked with __THROW.  */
extern int getgrnam_r (const char *__restrict __name,
		       struct group *__restrict __resultbuf,
		       char *__restrict __buffer, size_t __buflen,
		       struct group **__restrict __result);

# ifdef	__USE_MISC
/* Read a group entry from STREAM.  This function is not standardized
   an probably never will.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int fgetgrent_r (FILE *__restrict __stream,
			struct group *__restrict __resultbuf,
			char *__restrict __buffer, size_t __buflen,
			struct group **__restrict __result);
# endif

#endif	/* POSIX or reentrant */


#ifdef	__USE_MISC

# define __need_size_t
# include <stddef.h>

/* Set the group set for the current user to GROUPS (N of them).  */
extern int setgroups (size_t __n, const __gid_t *__groups) __THROW;

/* Store at most *NGROUPS members of the group set for USER into
   *GROUPS.  Also include GROUP.  The actual number of groups found is
   returned in *NGROUPS.  Return -1 if the if *NGROUPS is too small.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int getgrouplist (const char *__user, __gid_t __group,
			 __gid_t *__groups, int *__ngroups);

/* Initialize the group set for the current user
   by reading the group database and using all groups
   of which USER is a member.  Also include GROUP.

   This function is not part of POSIX and therefore no official
   cancellation point.  But due to similarity with an POSIX interface
   or due to the implementation it is a cancellation point and
   therefore not marked with __THROW.  */
extern int initgroups (const char *__user, __gid_t __group);

#endif /* Use misc.  */

__END_DECLS

#endif /* grp.h  */

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