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/virtio_vsock.h
/*
 * This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
 * anyone can use the definitions to implement compatible drivers/servers:
 *
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of IBM nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * Copyright (C) Red Hat, Inc., 2013-2015
 * Copyright (C) Asias He <asias@redhat.com>, 2013
 * Copyright (C) Stefan Hajnoczi <stefanha@redhat.com>, 2015
 */

#ifndef _LINUX_VIRTIO_VSOCK_H
#define _LINUX_VIRTIO_VSOCK_H

#include <linux/types.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_config.h>

struct virtio_vsock_config {
	__le64 guest_cid;
} __attribute__((packed));

enum virtio_vsock_event_id {
	VIRTIO_VSOCK_EVENT_TRANSPORT_RESET = 0,
};

struct virtio_vsock_event {
	__le32 id;
} __attribute__((packed));

struct virtio_vsock_hdr {
	__le64	src_cid;
	__le64	dst_cid;
	__le32	src_port;
	__le32	dst_port;
	__le32	len;
	__le16	type;		/* enum virtio_vsock_type */
	__le16	op;		/* enum virtio_vsock_op */
	__le32	flags;
	__le32	buf_alloc;
	__le32	fwd_cnt;
} __attribute__((packed));

enum virtio_vsock_type {
	VIRTIO_VSOCK_TYPE_STREAM = 1,
};

enum virtio_vsock_op {
	VIRTIO_VSOCK_OP_INVALID = 0,

	/* Connect operations */
	VIRTIO_VSOCK_OP_REQUEST = 1,
	VIRTIO_VSOCK_OP_RESPONSE = 2,
	VIRTIO_VSOCK_OP_RST = 3,
	VIRTIO_VSOCK_OP_SHUTDOWN = 4,

	/* To send payload */
	VIRTIO_VSOCK_OP_RW = 5,

	/* Tell the peer our credit info */
	VIRTIO_VSOCK_OP_CREDIT_UPDATE = 6,
	/* Request the peer to send the credit info to us */
	VIRTIO_VSOCK_OP_CREDIT_REQUEST = 7,
};

/* VIRTIO_VSOCK_OP_SHUTDOWN flags values */
enum virtio_vsock_shutdown {
	VIRTIO_VSOCK_SHUTDOWN_RCV = 1,
	VIRTIO_VSOCK_SHUTDOWN_SEND = 2,
};

#endif /* _LINUX_VIRTIO_VSOCK_H */

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