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/mman.h
/* Definitions for POSIX memory map interface.  Linux/x86_64 version.
   Copyright (C) 2001-2018 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 _SYS_MMAN_H
# error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
#endif

/* The following definitions basically come from the kernel headers.
   But the kernel header is not namespace clean.  */

/* Other flags.  */
#ifdef __USE_MISC
# define MAP_32BIT	0x40		/* Only give out 32-bit addresses.  */
#endif

/* These are Linux-specific.  */
#ifdef __USE_MISC
# define MAP_GROWSDOWN	0x00100		/* Stack-like segment.  */
# define MAP_DENYWRITE	0x00800		/* ETXTBSY */
# define MAP_EXECUTABLE	0x01000		/* Mark it as an executable.  */
# define MAP_LOCKED	0x02000		/* Lock the mapping.  */
# define MAP_NORESERVE	0x04000		/* Don't check for reservations.  */
# define MAP_POPULATE	0x08000		/* Populate (prefault) pagetables.  */
# define MAP_NONBLOCK	0x10000		/* Do not block on IO.  */
# define MAP_STACK	0x20000		/* Allocation is for a stack.  */
# define MAP_HUGETLB	0x40000		/* Create huge page mapping.  */
# define MAP_SYNC	0x80000		/* Perform synchronous page
					   faults for the mapping.  */
# define MAP_FIXED_NOREPLACE 0x100000	/* MAP_FIXED but do not unmap
					   underlying mapping.  */
#endif

/* Include generic Linux declarations.  */
#include <bits/mman-linux.h>

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