[英]Killing children of children in python with subprocess
Does python provide a way to find the children of a child process spawned using subprocess, so that I can kill them properly? python是否提供一种方法来查找使用子进程生成的子进程的子进程,以便我可以正确地杀死它们? If not, what is a good way of ensuring that the children of a child are killed?
如果不是,那么确保孩子的孩子被杀的好方法是什么?
The following applies to Unix only: 以下内容仅适用于Unix:
Calling os.setsid() in the child process will make it the session leader of a new session and the process group leader of a new process group . 在子进程中调用os.setsid()将使其成为新会话的会话负责人和新流程组的流程负责人。 Sending a SIGTERM to the process group will send a SIGTERM to all the subprocess that this child process might have spawned.
将SIGTERM发送到进程组会将SIGTERM发送到该子进程可能已产生的所有子进程。
You could do this using subprocess.Popen(..., preexec_fn=os.setsid)
. 您可以使用
subprocess.Popen(..., preexec_fn=os.setsid)
。 For example: 例如:
import signal
import os
import subprocess
import time
PIPE = subprocess.PIPE
proc = subprocess.Popen('ls -laR /', shell=True,
preexec_fn=os.setsid,
stdout=PIPE, stderr=PIPE)
time.sleep(2)
os.killpg(proc.pid, signal.SIGTERM)
Running this will show no output, but ps ax
will show the subprocess and the ls -laR
that it spawns are terminated. 运行此命令将不显示任何输出,但是
ps ax
将显示该子ls -laR
,并且其产生的ls -laR
被终止。
But if you comment out 但是如果你注释掉
preexec_fn=os.setsid
then ps ax
will show something like 然后
ps ax
会显示类似
% ps ax | grep "ls -la"
5409 pts/3 S 0:00 /bin/sh -c ls -laR /
5410 pts/3 R 0:05 ls -laR /
So without os.setsid
, ls -laR
and the shell that spawned it are still running. 因此,如果没有
os.setsid
, ls -laR
和产生它的shell仍在运行。 Be sure to kill them: 确保杀死它们:
% kill 5409
% kill 5410
并不是很容易,但是如果您的应用程序在Linux上运行,则可以遍历/ proc文件系统并构建其PPID(父PID)与子进程相同的所有PID的列表。
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