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/openssl/rand.h
/*
 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#ifndef HEADER_RAND_H
# define HEADER_RAND_H

# include <stdlib.h>
# include <openssl/ossl_typ.h>
# include <openssl/e_os2.h>
# include <openssl/randerr.h>

#ifdef  __cplusplus
extern "C" {
#endif

struct rand_meth_st {
    int (*seed) (const void *buf, int num);
    int (*bytes) (unsigned char *buf, int num);
    void (*cleanup) (void);
    int (*add) (const void *buf, int num, double randomness);
    int (*pseudorand) (unsigned char *buf, int num);
    int (*status) (void);
};

int RAND_set_rand_method(const RAND_METHOD *meth);
const RAND_METHOD *RAND_get_rand_method(void);
# ifndef OPENSSL_NO_ENGINE
int RAND_set_rand_engine(ENGINE *engine);
# endif

RAND_METHOD *RAND_OpenSSL(void);

# if OPENSSL_API_COMPAT < 0x10100000L
#   define RAND_cleanup() while(0) continue
# endif
int RAND_bytes(unsigned char *buf, int num);
int RAND_priv_bytes(unsigned char *buf, int num);
DEPRECATEDIN_1_1_0(int RAND_pseudo_bytes(unsigned char *buf, int num))

void RAND_seed(const void *buf, int num);
void RAND_keep_random_devices_open(int keep);

# if defined(__ANDROID__) && defined(__NDK_FPABI__)
__NDK_FPABI__	/* __attribute__((pcs("aapcs"))) on ARM */
# endif
void RAND_add(const void *buf, int num, double randomness);
int RAND_load_file(const char *file, long max_bytes);
int RAND_write_file(const char *file);
const char *RAND_file_name(char *file, size_t num);
int RAND_status(void);

# ifndef OPENSSL_NO_EGD
int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes);
int RAND_egd(const char *path);
int RAND_egd_bytes(const char *path, int bytes);
# endif

int RAND_poll(void);

# if defined(_WIN32) && (defined(BASETYPES) || defined(_WINDEF_H))
/* application has to include <windows.h> in order to use these */
DEPRECATEDIN_1_1_0(void RAND_screen(void))
DEPRECATEDIN_1_1_0(int RAND_event(UINT, WPARAM, LPARAM))
# endif

# ifdef OPENSSL_FIPS
/* just stubs for API compatibility */
void RAND_set_fips_drbg_type(int type, int flags);
int RAND_init_fips(void);
# endif

#ifdef  __cplusplus
}
#endif

#endif

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