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/userio.h
/* SPDX-License-Identifier: LGPL-2.0+ WITH Linux-syscall-note */
/*
 * userio: virtual serio device support
 * Copyright (C) 2015 Red Hat
 * Copyright (C) 2015 Lyude (Stephen Chandler Paul) <cpaul@redhat.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 *
 * This is the public header used for user-space communication with the userio
 * driver. __attribute__((__packed__)) is used for all structs to keep ABI
 * compatibility between all architectures.
 */

#ifndef _USERIO_H
#define _USERIO_H

#include <linux/types.h>

enum userio_cmd_type {
	USERIO_CMD_REGISTER = 0,
	USERIO_CMD_SET_PORT_TYPE = 1,
	USERIO_CMD_SEND_INTERRUPT = 2
};

/*
 * userio Commands
 * All commands sent to /dev/userio are encoded using this structure. The type
 * field should contain a USERIO_CMD* value that indicates what kind of command
 * is being sent to userio. The data field should contain the accompanying
 * argument for the command, if there is one.
 */
struct userio_cmd {
	__u8 type;
	__u8 data;
} __attribute__((__packed__));

#endif /* !_USERIO_H */

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