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/linux/atalk.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef __LINUX_ATALK_H__
#define __LINUX_ATALK_H__

#include <linux/types.h>
#include <asm/byteorder.h>
#include <linux/socket.h>

/*
 * AppleTalk networking structures
 *
 * The following are directly referenced from the University Of Michigan
 * netatalk for compatibility reasons.
 */
#define ATPORT_FIRST	1
#define ATPORT_RESERVED	128
#define ATPORT_LAST	254		/* 254 is only legal on localtalk */ 
#define ATADDR_ANYNET	(__u16)0
#define ATADDR_ANYNODE	(__u8)0
#define ATADDR_ANYPORT  (__u8)0
#define ATADDR_BCAST	(__u8)255
#define DDP_MAXSZ	587
#define DDP_MAXHOPS     15		/* 4 bits of hop counter */

#define SIOCATALKDIFADDR       (SIOCPROTOPRIVATE + 0)

struct atalk_addr {
	__be16	s_net;
	__u8	s_node;
};

struct sockaddr_at {
	__kernel_sa_family_t sat_family;
	__u8		  sat_port;
	struct atalk_addr sat_addr;
	char		  sat_zero[8];
};

struct atalk_netrange {
	__u8	nr_phase;
	__be16	nr_firstnet;
	__be16	nr_lastnet;
};

#endif /* __LINUX_ATALK_H__ */

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