Windows equivalent for spawning and killing separate process group in Python 3?

问题

I have a web server that needs to manage a separate multi-process subprocess (i.e. starting it and killing it).

For Unix-based systems, the following works fine:

# save the pid as `pid`
ps = subprocess.Popen(cmd, preexec_fn=os.setsid)

# elsewhere:
os.killpg(os.getpgid(pid), signal.SIGTERM)

I'm doing it this way (with os.setsid) because otherwise killing the progress group will also kill the web server.

On Windows these os functions are not available -- so if I wanted to accomplish something similar on Windows, how would I do this?

I'm using Python 3.5.

回答1:

THIS ANSWER IS PROVIDED BY eryksun IN COMMENT. I PUT IT HERE TO HIGHLIGHT IT FOR SOMEONE MAY ALSO GET INVOLVED IN THIS PROBLEM。

Here is what he said:

You can create a new process group via ps = subprocess.Popen(cmd, creationflags=subprocess.CREATE_NEW_PROCESS_GROUP). The group ID is the process ID of the lead process. That said, it's only useful for processes in the tree that are attached to the same console (conhost.exe instance) as your process, if your process even has a console. In this case, you can send the group a Ctrl+Break via ps.send_signal(signal.CTRL_BREAK_EVENT). Processes shouldn't ignore Ctrl+Break. They should either exit gracefully or let the default handler execute, which calls ExitProcess(STATUS_CONTROL_C_EXIT)

I tried it with this and succeed:

process = Popen(args=shlex.split(command), shell=shell, cwd=cwd, stdout=PIPE, stderr=PIPE,creationflags=subprocess.CREATE_NEW_PROCESS_GROUP)
/*...*/
process .send_signal(signal.CTRL_BREAK_EVENT)
process .kill()

来源：https://stackoverflow.com/questions/47016723/windows-equivalent-for-spawning-and-killing-separate-process-group-in-python-3