Python 杀死正在运行的子进程调用
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Kill a running subprocess call
提问by Thomas O
I'm launching a program with subprocesson Python.
我正在用subprocessPython启动一个程序。
In some cases the program may freeze. This is out of my control. The only thing I can do from the command line it is launched from is CtrlEscwhich kills the program quickly.
在某些情况下，程序可能会冻结。这是我无法控制的。我从它启动的命令行中唯一可以做的就是CtrlEsc快速杀死程序。
Is there any way to emulate this with subprocess? I am using subprocess.Popen(cmd, shell=True)to launch the program.
有什么办法可以模拟这个subprocess吗？我正在使用subprocess.Popen(cmd, shell=True)来启动该程序。
采纳答案by butch
p = subprocess.Popen("echo 'foo' && sleep 60 && echo 'bar'", shell=True)
p.kill()
Check out the docs on the subprocessmodule for more info: http://docs.python.org/2/library/subprocess.html
查看subprocess模块上的文档以获取更多信息：http: //docs.python.org/2/library/subprocess.html
回答by Aya
Well, there are a couple of methods on the object returned by subprocess.Popen()which may be of use: Popen.terminate()and Popen.kill(), which send a SIGTERMand SIGKILLrespectively.
好吧，返回的对象有几个方法subprocess.Popen()可能有用：Popen.terminate()and Popen.kill()，它们分别发送SIGTERM和SIGKILL。
For example...
例如...
import subprocess
import time
process = subprocess.Popen(cmd, shell=True)
time.sleep(5)
process.terminate()
...would terminate the process after five seconds.
...将在五秒后终止该过程。
Or you can use os.kill()to send other signals, like SIGINTto simulate CTRL-C, with...
或者您可以使用os.kill()发送其他信号，例如SIGINT模拟 CTRL-C，使用...
import subprocess
import time
import os
import signal
process = subprocess.Popen(cmd, shell=True)
time.sleep(5)
os.kill(process.pid, signal.SIGINT)
回答by ScotchAndSoda
Your question is not too clear, but If I assume that you are about to launch a process wich goes to zombie and you want to be able to control that in some state of your script. If this in the case, I propose you the following:
您的问题不太清楚，但是如果我假设您即将启动一个进入僵尸状态的进程，并且您希望能够在脚本的某种状态下控制它。如果是这种情况，我建议您：
p = subprocess.Popen([cmd_list], shell=False)
This in not really recommanded to pass through the shell. I would suggest you ti use shell=False, this way you risk less an overflow.
这并不是真的建议通过外壳。我建议你使用 shell=False，这样你就可以减少溢出的风险。
# Get the process id & try to terminate it gracefuly
pid = p.pid
p.terminate()
# Check if the process has really terminated & force kill if not.
try:
os.kill(pid, 0)
p.kill()
print "Forced kill"
except OSError, e:
print "Terminated gracefully"
回答by Asif Hasnain
You can use two signals to kill a running subprocess call i.e., signal.SIGTERM and signal.SIGKILL; for example
您可以使用两个信号来终止正在运行的子进程调用，即signal.SIGTERM 和signal.SIGKILL；例如
import subprocess
import os
import signal
import time
..
process = subprocess.Popen(..)
..
# killing all processes in the group
os.killpg(process.pid, signal.SIGTERM)
time.sleep(2)
if process.poll() is None: # Force kill if process is still alive
time.sleep(3)
os.killpg(process.pid, signal.SIGKILL)
回答by Micheal Bee
Try wrapping your subprocess.Popen call in a try except block. Depending on why your process is hanging, you may be able to cleanly exit. Here is a list of exceptions you can check for: Python 3 - Exceptions Handling
尝试将您的 subprocess.Popen 调用包装在 try except 块中。根据您的进程挂起的原因，您可能可以干净地退出。以下是您可以检查的异常列表： Python 3 - 异常处理
