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/rose.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * These are the public elements of the Linux kernel Rose implementation.
 * For kernel AX.25 see the file ax25.h. This file requires ax25.h for the
 * definition of the ax25_address structure.
 */

#ifndef	ROSE_KERNEL_H
#define	ROSE_KERNEL_H

#include <linux/socket.h>
#include <linux/ax25.h>

#define ROSE_MTU	251

#define ROSE_MAX_DIGIS 6

#define	ROSE_DEFER	1
#define ROSE_T1		2
#define	ROSE_T2		3
#define	ROSE_T3		4
#define	ROSE_IDLE	5
#define	ROSE_QBITINCL	6
#define	ROSE_HOLDBACK	7

#define	SIOCRSGCAUSE		(SIOCPROTOPRIVATE+0)
#define	SIOCRSSCAUSE		(SIOCPROTOPRIVATE+1)
#define	SIOCRSL2CALL		(SIOCPROTOPRIVATE+2)
#define	SIOCRSSL2CALL		(SIOCPROTOPRIVATE+2)
#define	SIOCRSACCEPT		(SIOCPROTOPRIVATE+3)
#define	SIOCRSCLRRT		(SIOCPROTOPRIVATE+4)
#define	SIOCRSGL2CALL		(SIOCPROTOPRIVATE+5)
#define	SIOCRSGFACILITIES	(SIOCPROTOPRIVATE+6)

#define	ROSE_DTE_ORIGINATED	0x00
#define	ROSE_NUMBER_BUSY	0x01
#define	ROSE_INVALID_FACILITY	0x03
#define	ROSE_NETWORK_CONGESTION	0x05
#define	ROSE_OUT_OF_ORDER	0x09
#define	ROSE_ACCESS_BARRED	0x0B
#define	ROSE_NOT_OBTAINABLE	0x0D
#define	ROSE_REMOTE_PROCEDURE	0x11
#define	ROSE_LOCAL_PROCEDURE	0x13
#define	ROSE_SHIP_ABSENT	0x39

typedef struct {
	char		rose_addr[5];
} rose_address;

struct sockaddr_rose {
	__kernel_sa_family_t srose_family;
	rose_address	srose_addr;
	ax25_address	srose_call;
	int		srose_ndigis;
	ax25_address	srose_digi;
};

struct full_sockaddr_rose {
	__kernel_sa_family_t srose_family;
	rose_address	srose_addr;
	ax25_address	srose_call;
	unsigned int	srose_ndigis;
	ax25_address	srose_digis[ROSE_MAX_DIGIS];
};

struct rose_route_struct {
	rose_address	address;
	unsigned short	mask;
	ax25_address	neighbour;
	char		device[16];
	unsigned char	ndigis;
	ax25_address	digipeaters[AX25_MAX_DIGIS];
};

struct rose_cause_struct {
	unsigned char	cause;
	unsigned char	diagnostic;
};

struct rose_facilities_struct {
	rose_address	source_addr,   dest_addr;
	ax25_address	source_call,   dest_call;
	unsigned char	source_ndigis, dest_ndigis;
	ax25_address	source_digis[ROSE_MAX_DIGIS];
	ax25_address	dest_digis[ROSE_MAX_DIGIS];
	unsigned int	rand;
	rose_address	fail_addr;
	ax25_address	fail_call;
};

#endif

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