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) 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:           |
   | https://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.               |
   +----------------------------------------------------------------------+
   | Authors: Dmitry Stogov <dmitry@php.net>                              |
   +----------------------------------------------------------------------+
*/

/* FastCGI protocol */

#define FCGI_VERSION_1 1

#define FCGI_MAX_LENGTH 0xffff

#define FCGI_KEEP_CONN  1

/* this is near the perfect hash function for most useful FastCGI variables
 * which combines efficiency and minimal hash collisions
 */

#define FCGI_HASH_FUNC(var, var_len) \
	(UNEXPECTED(var_len < 3) ? (unsigned int)var_len : \
		(((unsigned int)var[3]) << 2) + \
		(((unsigned int)var[var_len-2]) << 4) + \
		(((unsigned int)var[var_len-1]) << 2) + \
		var_len)

#define FCGI_GETENV(request, name) \
	fcgi_quick_getenv(request, name, sizeof(name)-1, FCGI_HASH_FUNC(name, sizeof(name)-1))

#define FCGI_PUTENV(request, name, value) \
	fcgi_quick_putenv(request, name, sizeof(name)-1, FCGI_HASH_FUNC(name, sizeof(name)-1), value)

typedef enum _fcgi_role {
	FCGI_RESPONDER	= 1,
	FCGI_AUTHORIZER	= 2,
	FCGI_FILTER		= 3
} fcgi_role;

enum {
	FCGI_DEBUG		= 1,
	FCGI_NOTICE		= 2,
	FCGI_WARNING	= 3,
	FCGI_ERROR		= 4,
	FCGI_ALERT		= 5,
};

typedef enum _fcgi_request_type {
	FCGI_BEGIN_REQUEST		=  1, /* [in]                              */
	FCGI_ABORT_REQUEST		=  2, /* [in]  (not supported)             */
	FCGI_END_REQUEST		=  3, /* [out]                             */
	FCGI_PARAMS				=  4, /* [in]  environment variables       */
	FCGI_STDIN				=  5, /* [in]  post data                   */
	FCGI_STDOUT				=  6, /* [out] response                    */
	FCGI_STDERR				=  7, /* [out] errors                      */
	FCGI_DATA				=  8, /* [in]  filter data (not supported) */
	FCGI_GET_VALUES			=  9, /* [in]                              */
	FCGI_GET_VALUES_RESULT	= 10  /* [out]                             */
} fcgi_request_type;

typedef enum _fcgi_protocol_status {
	FCGI_REQUEST_COMPLETE	= 0,
	FCGI_CANT_MPX_CONN		= 1,
	FCGI_OVERLOADED			= 2,
	FCGI_UNKNOWN_ROLE		= 3
} dcgi_protocol_status;

/* FastCGI client API */

typedef void (*fcgi_apply_func)(const char *var, unsigned int var_len, char *val, unsigned int val_len, void *arg);

#define FCGI_HASH_TABLE_SIZE 128
#define FCGI_HASH_TABLE_MASK (FCGI_HASH_TABLE_SIZE - 1)
#define FCGI_HASH_SEG_SIZE   4096

typedef struct _fcgi_request fcgi_request;

int fcgi_init(void);
void fcgi_shutdown(void);
int fcgi_is_fastcgi(void);
int fcgi_is_closed(fcgi_request *req);
void fcgi_close(fcgi_request *req, int force, int destroy);
int fcgi_in_shutdown(void);
void fcgi_terminate(void);
int fcgi_listen(const char *path, int backlog);
fcgi_request* fcgi_init_request(int listen_socket, void(*on_accept)(void), void(*on_read)(void), void(*on_close)(void));
void fcgi_destroy_request(fcgi_request *req);
void fcgi_set_allowed_clients(char *ip);
int fcgi_accept_request(fcgi_request *req);
int fcgi_finish_request(fcgi_request *req, int force_close);
const char *fcgi_get_last_client_ip(void);
void fcgi_set_in_shutdown(int new_value);
void fcgi_request_set_keep(fcgi_request *req, int new_value);

#ifndef HAVE_ATTRIBUTE_WEAK
typedef void (*fcgi_logger)(int type, const char *fmt, ...) ZEND_ATTRIBUTE_FORMAT(printf, 2, 3);
void fcgi_set_logger(fcgi_logger lg);
#endif

int   fcgi_has_env(fcgi_request *req);
char* fcgi_getenv(fcgi_request *req, const char* var, int var_len);
char* fcgi_putenv(fcgi_request *req, char* var, int var_len, char* val);
char* fcgi_quick_getenv(fcgi_request *req, const char* var, int var_len, unsigned int hash_value);
char* fcgi_quick_putenv(fcgi_request *req, char* var, int var_len, unsigned int hash_value, char* val);
void  fcgi_loadenv(fcgi_request *req, fcgi_apply_func load_func, zval *array);

int fcgi_read(fcgi_request *req, char *str, int len);

int fcgi_write(fcgi_request *req, fcgi_request_type type, const char *str, int len);
int fcgi_flush(fcgi_request *req, int end);
int fcgi_end(fcgi_request *req);

#ifdef PHP_WIN32
void fcgi_impersonate(void);
#endif

void fcgi_set_mgmt_var(const char * name, size_t name_len, const char * value, size_t value_len);
void fcgi_free_mgmt_var_cb(zval *zv);

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