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/bits/fcntl2.h
/* Checking macros for fcntl functions.
   Copyright (C) 2007-2018 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/>.  */

#ifndef	_FCNTL_H
# error "Never include <bits/fcntl2.h> directly; use <fcntl.h> instead."
#endif

/* Check that calls to open and openat with O_CREAT or O_TMPFILE set have an
   appropriate third/fourth parameter.  */
#ifndef __USE_FILE_OFFSET64
extern int __open_2 (const char *__path, int __oflag) __nonnull ((1));
extern int __REDIRECT (__open_alias, (const char *__path, int __oflag, ...),
		       open) __nonnull ((1));
#else
extern int __REDIRECT (__open_2, (const char *__path, int __oflag),
		       __open64_2) __nonnull ((1));
extern int __REDIRECT (__open_alias, (const char *__path, int __oflag, ...),
		       open64) __nonnull ((1));
#endif
__errordecl (__open_too_many_args,
	     "open can be called either with 2 or 3 arguments, not more");
__errordecl (__open_missing_mode,
	     "open with O_CREAT or O_TMPFILE in second argument needs 3 arguments");

__fortify_function int
open (const char *__path, int __oflag, ...)
{
  if (__va_arg_pack_len () > 1)
    __open_too_many_args ();

  if (__builtin_constant_p (__oflag))
    {
      if (__OPEN_NEEDS_MODE (__oflag) && __va_arg_pack_len () < 1)
	{
	  __open_missing_mode ();
	  return __open_2 (__path, __oflag);
	}
      return __open_alias (__path, __oflag, __va_arg_pack ());
    }

  if (__va_arg_pack_len () < 1)
    return __open_2 (__path, __oflag);

  return __open_alias (__path, __oflag, __va_arg_pack ());
}


#ifdef __USE_LARGEFILE64
extern int __open64_2 (const char *__path, int __oflag) __nonnull ((1));
extern int __REDIRECT (__open64_alias, (const char *__path, int __oflag,
					...), open64) __nonnull ((1));
__errordecl (__open64_too_many_args,
	     "open64 can be called either with 2 or 3 arguments, not more");
__errordecl (__open64_missing_mode,
	     "open64 with O_CREAT or O_TMPFILE in second argument needs 3 arguments");

__fortify_function int
open64 (const char *__path, int __oflag, ...)
{
  if (__va_arg_pack_len () > 1)
    __open64_too_many_args ();

  if (__builtin_constant_p (__oflag))
    {
      if (__OPEN_NEEDS_MODE (__oflag) && __va_arg_pack_len () < 1)
	{
	  __open64_missing_mode ();
	  return __open64_2 (__path, __oflag);
	}
      return __open64_alias (__path, __oflag, __va_arg_pack ());
    }

  if (__va_arg_pack_len () < 1)
    return __open64_2 (__path, __oflag);

  return __open64_alias (__path, __oflag, __va_arg_pack ());
}
#endif


#ifdef __USE_ATFILE
# ifndef __USE_FILE_OFFSET64
extern int __openat_2 (int __fd, const char *__path, int __oflag)
     __nonnull ((2));
extern int __REDIRECT (__openat_alias, (int __fd, const char *__path,
					int __oflag, ...), openat)
     __nonnull ((2));
# else
extern int __REDIRECT (__openat_2, (int __fd, const char *__path,
				    int __oflag), __openat64_2)
     __nonnull ((2));
extern int __REDIRECT (__openat_alias, (int __fd, const char *__path,
					int __oflag, ...), openat64)
     __nonnull ((2));
# endif
__errordecl (__openat_too_many_args,
	     "openat can be called either with 3 or 4 arguments, not more");
__errordecl (__openat_missing_mode,
	     "openat with O_CREAT or O_TMPFILE in third argument needs 4 arguments");

__fortify_function int
openat (int __fd, const char *__path, int __oflag, ...)
{
  if (__va_arg_pack_len () > 1)
    __openat_too_many_args ();

  if (__builtin_constant_p (__oflag))
    {
      if (__OPEN_NEEDS_MODE (__oflag) && __va_arg_pack_len () < 1)
	{
	  __openat_missing_mode ();
	  return __openat_2 (__fd, __path, __oflag);
	}
      return __openat_alias (__fd, __path, __oflag, __va_arg_pack ());
    }

  if (__va_arg_pack_len () < 1)
    return __openat_2 (__fd, __path, __oflag);

  return __openat_alias (__fd, __path, __oflag, __va_arg_pack ());
}


# ifdef __USE_LARGEFILE64
extern int __openat64_2 (int __fd, const char *__path, int __oflag)
     __nonnull ((2));
extern int __REDIRECT (__openat64_alias, (int __fd, const char *__path,
					  int __oflag, ...), openat64)
     __nonnull ((2));
__errordecl (__openat64_too_many_args,
	     "openat64 can be called either with 3 or 4 arguments, not more");
__errordecl (__openat64_missing_mode,
	     "openat64 with O_CREAT or O_TMPFILE in third argument needs 4 arguments");

__fortify_function int
openat64 (int __fd, const char *__path, int __oflag, ...)
{
  if (__va_arg_pack_len () > 1)
    __openat64_too_many_args ();

  if (__builtin_constant_p (__oflag))
    {
      if (__OPEN_NEEDS_MODE (__oflag) && __va_arg_pack_len () < 1)
	{
	  __openat64_missing_mode ();
	  return __openat64_2 (__fd, __path, __oflag);
	}
      return __openat64_alias (__fd, __path, __oflag, __va_arg_pack ());
    }

  if (__va_arg_pack_len () < 1)
    return __openat64_2 (__fd, __path, __oflag);

  return __openat64_alias (__fd, __path, __oflag, __va_arg_pack ());
}
# endif
#endif

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