python 如何获取进程的祖父母ID
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How to get process's grandparent id
提问by Anurag Uniyal
How can i get process id of the current process's parent?
In general given a process id how can I get its parent process id?
e.g. os.getpid() can be used to get the proccess id, and os.getppid() for the parent, how do I get grandparent,
如何获取当前进程的父进程的进程 ID？
一般来说，给定一个进程ID，我怎样才能获得它的父进程ID？
例如 os.getpid() 可用于获取进程 ID，而 os.getppid() 可用于获取父进程，我如何获取祖父母，
My target is linux(ubuntu) so platform specific answers are ok.
我的目标是 linux(ubuntu) 所以平台特定的答案是可以的。
采纳答案by pixelbeat
linux specific:
linux特定：
os.popen("ps -p %d -oppid=" % os.getppid()).read().strip()
回答by Giampaolo Rodolà
By using psutil ( https://github.com/giampaolo/psutil):
通过使用 psutil ( https://github.com/giampaolo/psutil)：
>>> import psutil
>>> psutil.Process().ppid()
2335
>>> psutil.Process().parent()
<psutil.Process (pid=2335, name='bash', cmdline='bash') at 140052120886608>
>>>
回答by paxdiablo
I don't think you can do this in a portable Python fashion. But there are two possibilities.
我认为您无法以可移植的 Python 方式执行此操作。但是有两种可能。
- The information is available from the
pscommand so you could analyze that. - If you have a system with the
procfile systems, you can open the file/proc/<pid>/statusand search for the line containingPPid:, then do the same for that PID.
- 该信息可从
ps命令中获得，因此您可以对其进行分析。 - 如果您的系统带有
proc文件系统，则可以打开文件/proc/<pid>/status并搜索包含 的行PPid:，然后对该 PID 执行相同操作。
For example the following script will get you your PID, PPID and PPPID, permissions willing:
例如，以下脚本将为您提供您的 PID、PPID 和 PPPID，以及愿意的权限：
#!/bin/bash
pid=$$
ppid=$(grep PPid: /proc/${pid}/status | awk '{print '})
pppid=$(grep PPid: /proc/${ppid}/status | awk '{print '})
echo ${pid} ${ppid} ${pppid}
ps -f -p "${pid},${ppid},${pppid}"
produces:
产生：
3269 3160 3142
UID PID PPID C STIME TTY TIME CMD
pax 3142 2786 0 18:24 pts/1 00:00:00 bash
root 3160 3142 0 18:24 pts/1 00:00:00 bash
root 3269 3160 0 18:34 pts/1 00:00:00 /bin/bash ./getem.sh
Obviously, you'd have to open those files with Python.
显然，您必须使用 Python 打开这些文件。
回答by tzot
from __future__ import with_statement
def pnid(pid=None, N=1):
"Get parent (if N==1), grandparent (if N==2), ... of pid (or self if not given)"
if pid is None:
pid= "self"
while N > 0:
filename= "/proc/%s/status" % pid
with open(filename, "r") as fp:
for line in fp:
if line.startswith("PPid:"):
_, _, pid= line.rpartition("\t")
pid= pid.rstrip() # drop the '\n' at end
break
else:
raise RuntimeError, "can't locate PPid line in %r" % filename
N-= 1
return int(pid) # let it fail through
>>> pnid()
26558
>>> import os
>>> os.getppid()
26558
>>> pnid(26558)
26556
>>> pnid(N=2)
26556
>>> pnid(N=3)
1
回答by Nick Dixon
If you have a POSIX-compliant 'ps' command, which allows you to specify the columns you want, like this:
ps -o pid,ppid
如果您有符合 POSIX 的“ps”命令，它允许您指定所需的列，如下所示：
ps -o pid,ppid
You could then try:
然后你可以尝试：
import os
import re
ps = os.popen("ps -o pid,ppid")
ps.readline() # discard header
lines = ps.readlines()
ps.close
procs = [ re.split("\s+", line.strip()) for line in lines ]
parent = {}
for proc in procs:
parent[ int(proc[0]) ] = int(proc[1])
Now you can do:
现在你可以这样做：
parent[ parent[pid] ]
You could even write a function to list a process' ancestors:
您甚至可以编写一个函数来列出进程的祖先：
def listp(pid):
print(pid)
if parent.has_key(pid):
listp( parent[pid] )
回答by ddaa
I do not think you can do this portably in the general case.
我不认为你可以在一般情况下轻松地做到这一点。
You need to get this information from the process list (e.g. through the pscommand), which is obtained in a system-specific way.
您需要从进程列表（例如通过ps命令）中获取此信息，该信息以特定于系统的方式获取。
