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/atm_tcp.h
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/* atm_tcp.h - Driver-specific declarations of the ATMTCP driver (for use by
	       driver-specific utilities) */

/* Written 1997-2000 by Werner Almesberger, EPFL LRC/ICA */


#ifndef LINUX_ATM_TCP_H
#define LINUX_ATM_TCP_H

#include <linux/atmapi.h>
#include <linux/atm.h>
#include <linux/atmioc.h>
#include <linux/types.h>


/*
 * All values in struct atmtcp_hdr are in network byte order
 */

struct atmtcp_hdr {
	__u16	vpi;
	__u16	vci;
	__u32	length;		/* ... of data part */
};

/*
 * All values in struct atmtcp_command are in host byte order
 */

#define ATMTCP_HDR_MAGIC	(~0)	/* this length indicates a command */
#define ATMTCP_CTRL_OPEN	1	/* request/reply */
#define ATMTCP_CTRL_CLOSE	2	/* request/reply */

struct atmtcp_control {
	struct atmtcp_hdr hdr;	/* must be first */
	int type;		/* message type; both directions */
	atm_kptr_t vcc;		/* both directions */
	struct sockaddr_atmpvc addr; /* suggested value from kernel */
	struct atm_qos	qos;	/* both directions */
	int result;		/* to kernel only */
} __ATM_API_ALIGN;

/*
 * Field usage:
 * Messge type	dir.	hdr.v?i	type	addr	qos	vcc	result
 * -----------  ----	------- ----	----	---	---	------
 * OPEN		K->D	Y	Y	Y	Y	Y	0
 * OPEN		D->K	-	Y	Y	Y	Y	Y
 * CLOSE	K->D	-	-	Y	-	Y	0
 * CLOSE	D->K	-	-	-	-	Y	Y
 */

#define SIOCSIFATMTCP	_IO('a',ATMIOC_ITF)	/* set ATMTCP mode */
#define ATMTCP_CREATE	_IO('a',ATMIOC_ITF+14)	/* create persistent ATMTCP
						   interface */
#define ATMTCP_REMOVE	_IO('a',ATMIOC_ITF+15)	/* destroy persistent ATMTCP
						   interface */



#endif /* LINUX_ATM_TCP_H */

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