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　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。 . Prv8 Shell

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Current File : //usr/include/bind9/lwres/net.h

/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

#ifndef LWRES_NET_H
#define LWRES_NET_H 1

/*****
 ***** Module Info
 *****/

/*! \file net.h
 * This module is responsible for defining the following basic networking
 * types:
 *
 *\li		struct in_addr
 *\li		struct in6_addr
 *\li		struct sockaddr
 *\li		struct sockaddr_in
 *\li		struct sockaddr_in6
 *
 * It ensures that the AF_ and PF_ macros are defined.
 *
 * It declares ntoh[sl]() and hton[sl]().
 *
 * It declares lwres_net_aton(), lwres_net_ntop(), and lwres_net_pton().
 *
 * It ensures that #INADDR_LOOPBACK, #INADDR_ANY and #IN6ADDR_ANY_INIT
 * are defined.
 */

/***
 *** Imports.
 ***/

#include <lwres/platform.h>	/* Required for LWRES_PLATFORM_*. */

#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>		/* Contractual promise. */
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/un.h>

#include <netinet/in.h>		/* Contractual promise. */
#include <arpa/inet.h>		/* Contractual promise. */
#ifdef LWRES_PLATFORM_NEEDNETINETIN6H
#include <netinet/in6.h>	/* Required on UnixWare. */
#endif
#ifdef LWRES_PLATFORM_NEEDNETINET6IN6H
#include <netinet6/in6.h>	/* Required on BSD/OS for in6_pktinfo. */
#endif
#include <net/if.h>

#include <lwres/lang.h>

#ifndef LWRES_PLATFORM_HAVEIPV6
#include <lwres/ipv6.h>		/* Contractual promise. */
#endif

#ifdef LWRES_PLATFORM_HAVEINADDR6
#define in6_addr in_addr6	/* Required for pre RFC2133 implementations. */
#endif

/*!
 * Required for some pre RFC2133 implementations.
 * IN6ADDR_ANY_INIT and IN6ADDR_LOOPBACK_INIT were added in
 * draft-ietf-ipngwg-bsd-api-04.txt or draft-ietf-ipngwg-bsd-api-05.txt.
 * If 's6_addr' is defined then assume that there is a union and three
 * levels otherwise assume two levels required.
 */
#ifndef IN6ADDR_ANY_INIT
#ifdef s6_addr
#define IN6ADDR_ANY_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } } }
#else
#define IN6ADDR_ANY_INIT { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 } }
#endif
#endif

/*!
 * Initialize address loopback.  See IN6ADDR_ANY_INIT
 */
#ifndef IN6ADDR_LOOPBACK_INIT
#ifdef s6_addr
#define IN6ADDR_LOOPBACK_INIT { { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } } }
#else
#define IN6ADDR_LOOPBACK_INIT { { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1 } }
#endif
#endif

/*% Used by AI_ALL */
#ifndef AF_INET6
#define AF_INET6 99
#endif


/*% Used to return IPV6 address types. */
#ifndef PF_INET6
#define PF_INET6 AF_INET6
#endif

/*% inaddr Loopback */
#ifndef INADDR_LOOPBACK
#define INADDR_LOOPBACK 0x7f000001UL
#endif

LWRES_LANG_BEGINDECLS

const char *
lwres_net_ntop(int af, const void *src, char *dst, size_t size);

int
lwres_net_pton(int af, const char *src, void *dst);

int
lwres_net_aton(const char *cp, struct in_addr *addr);

LWRES_LANG_ENDDECLS

#endif /* LWRES_NET_H */

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