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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/*
  +----------------------------------------------------------------------+
  | PHP Version 7                                                        |
  +----------------------------------------------------------------------+
  | Copyright (c) The PHP Group                                          |
  +----------------------------------------------------------------------+
  | This source file is subject to version 3.01 of the PHP license,      |
  | that is bundled with this package in the file LICENSE, and is        |
  | available through the world-wide-web at the following url:           |
  | http://www.php.net/license/3_01.txt                                  |
  | If you did not receive a copy of the PHP license and are unable to   |
  | obtain it through the world-wide-web, please send a note to          |
  | license@php.net so we can mail you a copy immediately.               |
  +----------------------------------------------------------------------+
  | Author: Wez Furlong <wez@thebrainroom.com>                           |
  +----------------------------------------------------------------------+
*/

/* Memory Mapping interface for streams.
 * The intention is to provide a uniform interface over the most common
 * operations that are used within PHP itself, rather than a complete
 * API for all memory mapping needs.
 *
 * ATM, we support only mmap(), but win32 memory mapping support will
 * follow soon.
 * */

typedef enum {
	/* Does the stream support mmap ? */
	PHP_STREAM_MMAP_SUPPORTED,
	/* Request a range and offset to be mapped;
	 * while mapped, you MUST NOT use any read/write functions
	 * on the stream (win9x compatibility) */
	PHP_STREAM_MMAP_MAP_RANGE,
	/* Unmap the last range that was mapped for the stream */
	PHP_STREAM_MMAP_UNMAP
} php_stream_mmap_operation_t;

typedef enum {
	PHP_STREAM_MAP_MODE_READONLY,
	PHP_STREAM_MAP_MODE_READWRITE,
	PHP_STREAM_MAP_MODE_SHARED_READONLY,
	PHP_STREAM_MAP_MODE_SHARED_READWRITE
} php_stream_mmap_access_t;

typedef struct {
	/* requested offset and length.
	 * If length is 0, the whole file is mapped */
	size_t offset;
	size_t length;

	php_stream_mmap_access_t mode;

	/* returned mapped address */
	char *mapped;

} php_stream_mmap_range;

#define PHP_STREAM_MMAP_ALL 0

#define PHP_STREAM_MMAP_MAX (512 * 1024 * 1024)

#define php_stream_mmap_supported(stream)	(_php_stream_set_option((stream), PHP_STREAM_OPTION_MMAP_API, PHP_STREAM_MMAP_SUPPORTED, NULL) == 0 ? 1 : 0)

/* Returns 1 if the stream in its current state can be memory mapped,
 * 0 otherwise */
#define php_stream_mmap_possible(stream)			(!php_stream_is_filtered((stream)) && php_stream_mmap_supported((stream)))

BEGIN_EXTERN_C()
PHPAPI char *_php_stream_mmap_range(php_stream *stream, size_t offset, size_t length, php_stream_mmap_access_t mode, size_t *mapped_len);
#define php_stream_mmap_range(stream, offset, length, mode, mapped_len)	_php_stream_mmap_range((stream), (offset), (length), (mode), (mapped_len))

/* un-maps the last mapped range */
PHPAPI int _php_stream_mmap_unmap(php_stream *stream);
#define php_stream_mmap_unmap(stream)				_php_stream_mmap_unmap((stream))

PHPAPI int _php_stream_mmap_unmap_ex(php_stream *stream, zend_off_t readden);
#define php_stream_mmap_unmap_ex(stream, readden)			_php_stream_mmap_unmap_ex((stream), (readden))
END_EXTERN_C()

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