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/cn_proc.h
/* SPDX-License-Identifier: LGPL-2.1 WITH Linux-syscall-note */
/*
 * cn_proc.h - process events connector
 *
 * Copyright (C) Matt Helsley, IBM Corp. 2005
 * Based on cn_fork.h by Nguyen Anh Quynh and Guillaume Thouvenin
 * Copyright (C) 2005 Nguyen Anh Quynh <aquynh@gmail.com>
 * Copyright (C) 2005 Guillaume Thouvenin <guillaume.thouvenin@bull.net>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2.1 of the GNU Lesser General Public License
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef CN_PROC_H
#define CN_PROC_H

#include <linux/types.h>

/*
 * Userspace sends this enum to register with the kernel that it is listening
 * for events on the connector.
 */
enum proc_cn_mcast_op {
	PROC_CN_MCAST_LISTEN = 1,
	PROC_CN_MCAST_IGNORE = 2
};

/*
 * From the user's point of view, the process
 * ID is the thread group ID and thread ID is the internal
 * kernel "pid". So, fields are assigned as follow:
 *
 *  In user space     -  In  kernel space
 *
 * parent process ID  =  parent->tgid
 * parent thread  ID  =  parent->pid
 * child  process ID  =  child->tgid
 * child  thread  ID  =  child->pid
 */

struct proc_event {
	enum what {
		/* Use successive bits so the enums can be used to record
		 * sets of events as well
		 */
		PROC_EVENT_NONE = 0x00000000,
		PROC_EVENT_FORK = 0x00000001,
		PROC_EVENT_EXEC = 0x00000002,
		PROC_EVENT_UID  = 0x00000004,
		PROC_EVENT_GID  = 0x00000040,
		PROC_EVENT_SID  = 0x00000080,
		PROC_EVENT_PTRACE = 0x00000100,
		PROC_EVENT_COMM = 0x00000200,
		/* "next" should be 0x00000400 */
		/* "last" is the last process event: exit,
		 * while "next to last" is coredumping event */
		PROC_EVENT_COREDUMP = 0x40000000,
		PROC_EVENT_EXIT = 0x80000000
	} what;
	__u32 cpu;
	__u64 __attribute__((aligned(8))) timestamp_ns;
		/* Number of nano seconds since system boot */
	union { /* must be last field of proc_event struct */
		struct {
			__u32 err;
		} ack;

		struct fork_proc_event {
			__kernel_pid_t parent_pid;
			__kernel_pid_t parent_tgid;
			__kernel_pid_t child_pid;
			__kernel_pid_t child_tgid;
		} fork;

		struct exec_proc_event {
			__kernel_pid_t process_pid;
			__kernel_pid_t process_tgid;
		} exec;

		struct id_proc_event {
			__kernel_pid_t process_pid;
			__kernel_pid_t process_tgid;
			union {
				__u32 ruid; /* task uid */
				__u32 rgid; /* task gid */
			} r;
			union {
				__u32 euid;
				__u32 egid;
			} e;
		} id;

		struct sid_proc_event {
			__kernel_pid_t process_pid;
			__kernel_pid_t process_tgid;
		} sid;

		struct ptrace_proc_event {
			__kernel_pid_t process_pid;
			__kernel_pid_t process_tgid;
			__kernel_pid_t tracer_pid;
			__kernel_pid_t tracer_tgid;
		} ptrace;

		struct comm_proc_event {
			__kernel_pid_t process_pid;
			__kernel_pid_t process_tgid;
			char           comm[16];
		} comm;

		struct coredump_proc_event {
			__kernel_pid_t process_pid;
			__kernel_pid_t process_tgid;
			__kernel_pid_t parent_pid;
			__kernel_pid_t parent_tgid;
		} coredump;

		struct exit_proc_event {
			__kernel_pid_t process_pid;
			__kernel_pid_t process_tgid;
			__u32 exit_code, exit_signal;
			__kernel_pid_t parent_pid;
			__kernel_pid_t parent_tgid;
		} exit;

	} event_data;
};

#endif /* CN_PROC_H */

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