Linux：如何查找守护进程和僵尸进程列表
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Linux: How to find the list of daemon processes and zombie processes
提问by kris123456
I tried checking on Google, but I couldn't find much information related to the actual question.
我尝试在 Google 上查看，但找不到与实际问题相关的太多信息。
How do I get a consolidated list of zombie processes and daemon processes? How do I do it on different operating systems. Linux? AIX? Windows?
如何获得僵尸进程和守护进程的综合列表？我如何在不同的操作系统上做到这一点。Linux？艾克斯？视窗？
I am sure that, based on PID, we cannot identify the type of process. Running through a terminal might not help either.
我确信，基于 PID，我们无法识别进程的类型。通过终端运行也可能无济于事。
回答by kris123456
To get the list of Zombie and daemon process just write a psudo character dev driver, where you should navigate trough the task_struct and look for state
要获取僵尸和守护进程的列表，只需编写一个伪字符开发驱动程序，您应该在其中导航通过 task_struct 并查找状态
回答by kaiwan
With GNU ps on Linux:
在 Linux 上使用 GNU ps：
[
[
$ ps --version
procps-ng version 3.3.3
]
]
Zombies:
僵尸：
ps -lA | grep '^. Z'
will get you all zombies (note that the param is lowercase 'L', i.e., 'l' followed by 'A').
会给你所有的僵尸（注意参数是小写的“L”，即“l”后跟“A”）。
Daemons:
守护进程：
As @Barmar said there's no way to get daemons for certain, but a clue that a process is a daemon is that it's not associated with any TTY device. The 12th column of 'ps -Al' output is TTY; the 4th is PID, 14th is the process name. Hence:
正如@Barmar 所说，无法确定获得守护进程，但是进程是守护进程的一个线索是它不与任何 TTY 设备相关联。'ps -Al' 输出的第 12 列是 TTY；第 4 个是 PID，第 14 个是进程名称。因此：
ps -lA | awk ' == "?" {print , }'
will get you processes that are possiblydaemons; not guaranteed! :)
将为您提供可能是守护进程的进程；不保证！:)
回答by Ann B
Daemons are started by the init process, which means they have a PPID of 1.
守护进程由 init 进程启动，这意味着它们的 PPID 为 1。
Therefore:
所以：
ps -ef | awk ' == 1'
回答by madala
Try out this.
试试这个。
ps axo pid,ppid,pgrp,tty,tpgid,sess,comm |awk '==1' |awk '=='
In the above command I used the very properties of a daemon to filter them out, from all of existing processes in Linux.
在上面的命令中，我使用了守护进程的特性将它们从 Linux 中的所有现有进程中过滤掉。
The parent of a daemon is always Init, so check for ppid 1. The daemon is normally not associated with any terminal, hence we have ‘?' under tty. The process-id and process-group-id of a daemon are normally same The session-id of a daemon is same as it process id.
守护进程的父进程总是 Init，所以检查 ppid 1。守护进程通常不与任何终端关联，因此我们有“？” 在 tty 下。守护进程的 process-id 和 process-group-id 通常相同 守护进程的 session-id 与其进程 id 相同。
回答by Massimo
I wrote for daemons and the "old" sysv initd, you have to check if it is working on your distro.
我为守护进程和“旧的”sysv initd 编写了代码，您必须检查它是否在您的发行版上运行。
Good demons have well written startup scripts in /etc/initd
好恶魔在 /etc/initd 中写好了启动脚本
When changing runlevel, how does init know the running daemons ?
更改运行级别时，init 如何知道正在运行的守护进程？
It looks for their names in the directory
它在目录中查找他们的名字
/var/lock/subsys
So you can
这样你就可以
get the names list from there
scan all the running processes and check if the name is inside the list: bingo !
从那里获取姓名列表
扫描所有正在运行的进程并检查名称是否在列表中：宾果游戏！
To scan all the processes: list every subdirectory in
扫描所有进程：列出每个子目录
/proc
If its name is digits, it is the pid of a running process.
如果它的名称是数字，则它是正在运行的进程的 pid。
For example, the status of the process with pid 1234 is this file
比如pid为1234的进程状态就是这个文件
/proc/1234/status
Open it and get the first line, starts with "Name:"
打开它并获得第一行，以“名称：”开头
See
看
