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/sync_file.h
/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
/*
 * Copyright (C) 2012 Google, Inc.
 *
 * 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 General Public License for more details.
 *
 */

#ifndef _LINUX_SYNC_H
#define _LINUX_SYNC_H

#include <linux/ioctl.h>
#include <linux/types.h>

/**
 * struct sync_merge_data - data passed to merge ioctl
 * @name:	name of new fence
 * @fd2:	file descriptor of second fence
 * @fence:	returns the fd of the new fence to userspace
 * @flags:	merge_data flags
 * @pad:	padding for 64-bit alignment, should always be zero
 */
struct sync_merge_data {
	char	name[32];
	__s32	fd2;
	__s32	fence;
	__u32	flags;
	__u32	pad;
};

/**
 * struct sync_fence_info - detailed fence information
 * @obj_name:		name of parent sync_timeline
* @driver_name:	name of driver implementing the parent
* @status:		status of the fence 0:active 1:signaled <0:error
 * @flags:		fence_info flags
 * @timestamp_ns:	timestamp of status change in nanoseconds
 */
struct sync_fence_info {
	char	obj_name[32];
	char	driver_name[32];
	__s32	status;
	__u32	flags;
	__u64	timestamp_ns;
};

/**
 * struct sync_file_info - data returned from fence info ioctl
 * @name:	name of fence
 * @status:	status of fence. 1: signaled 0:active <0:error
 * @flags:	sync_file_info flags
 * @num_fences	number of fences in the sync_file
 * @pad:	padding for 64-bit alignment, should always be zero
 * @sync_fence_info: pointer to array of structs sync_fence_info with all
 *		 fences in the sync_file
 */
struct sync_file_info {
	char	name[32];
	__s32	status;
	__u32	flags;
	__u32	num_fences;
	__u32	pad;

	__u64	sync_fence_info;
};

#define SYNC_IOC_MAGIC		'>'

/**
 * Opcodes  0, 1 and 2 were burned during a API change to avoid users of the
 * old API to get weird errors when trying to handling sync_files. The API
 * change happened during the de-stage of the Sync Framework when there was
 * no upstream users available.
 */

/**
 * DOC: SYNC_IOC_MERGE - merge two fences
 *
 * Takes a struct sync_merge_data.  Creates a new fence containing copies of
 * the sync_pts in both the calling fd and sync_merge_data.fd2.  Returns the
 * new fence's fd in sync_merge_data.fence
 */
#define SYNC_IOC_MERGE		_IOWR(SYNC_IOC_MAGIC, 3, struct sync_merge_data)

/**
 * DOC: SYNC_IOC_FILE_INFO - get detailed information on a sync_file
 *
 * Takes a struct sync_file_info. If num_fences is 0, the field is updated
 * with the actual number of fences. If num_fences is > 0, the system will
 * use the pointer provided on sync_fence_info to return up to num_fences of
 * struct sync_fence_info, with detailed fence information.
 */
#define SYNC_IOC_FILE_INFO	_IOWR(SYNC_IOC_MAGIC, 4, struct sync_file_info)

#endif /* _LINUX_SYNC_H */

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