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/mqueue.h
/* SPDX-License-Identifier: LGPL-2.1+ WITH Linux-syscall-note */
/* Copyright (C) 2003 Krzysztof Benedyczak & Michal Wronski

   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 2.1 of the License, or (at your option) any later version.

   It 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.

   You should have received a copy of the GNU Lesser General Public
   License along with this software; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef _LINUX_MQUEUE_H
#define _LINUX_MQUEUE_H

#include <linux/types.h>

#define MQ_PRIO_MAX 	32768
/* per-uid limit of kernel memory used by mqueue, in bytes */
#define MQ_BYTES_MAX	819200

struct mq_attr {
	__kernel_long_t	mq_flags;	/* message queue flags			*/
	__kernel_long_t	mq_maxmsg;	/* maximum number of messages		*/
	__kernel_long_t	mq_msgsize;	/* maximum message size			*/
	__kernel_long_t	mq_curmsgs;	/* number of messages currently queued	*/
	__kernel_long_t	__reserved[4];	/* ignored for input, zeroed for output */
};

/*
 * SIGEV_THREAD implementation:
 * SIGEV_THREAD must be implemented in user space. If SIGEV_THREAD is passed
 * to mq_notify, then
 * - sigev_signo must be the file descriptor of an AF_NETLINK socket. It's not
 *   necessary that the socket is bound.
 * - sigev_value.sival_ptr must point to a cookie that is NOTIFY_COOKIE_LEN
 *   bytes long.
 * If the notification is triggered, then the cookie is sent to the netlink
 * socket. The last byte of the cookie is replaced with the NOTIFY_?? codes:
 * NOTIFY_WOKENUP if the notification got triggered, NOTIFY_REMOVED if it was
 * removed, either due to a close() on the message queue fd or due to a
 * mq_notify() that removed the notification.
 */
#define NOTIFY_NONE	0
#define NOTIFY_WOKENUP	1
#define NOTIFY_REMOVED	2

#define NOTIFY_COOKIE_LEN	32

#endif

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