[Haskell-cafe] how to terminate a (Posix) process and all its subprocesses?

[Levent Erkok]

Hi Johannes:

I had a similar question a few years back using the async library and in
particular the 'race' function. I got a nice answer on StackOverflow:


https://stackoverflow.com/questions/24446154/control-concurrent-async-race-and-runinteractiveprocess

I think you can use the ideas in there. Bottom line: You can use a
combination of 'onException' and 'terminateProcess' and let your spawned
processes clean-up after themselves properly.

Cheers,

-Levent.

On Tue, Jul 24, 2018 at 6:42 AM, Johannes Waldmann <
johannes.waldmann at htwk-leipzig.de> wrote:

> Dear Cafe,
>
> I am using
> https://hackage.haskell.org/package/process-1.6.4.0/docs/
> System-Process.html#v:readProcess
> to start an external command, and wait for its completion.
>
> Now I would like to time-out this after a while.
> I can use
> https://hackage.haskell.org/package/base-4.11.1.0/docs/System-Timeout.html
> and this works in simple cases -
>
> but not in case the external command has spawned child processes.
> (cleanupProcess sends SIGTERM but only to the process at the top of
> the tree ?)
>
> I guess I need to use
> https://hackage.haskell.org/package/unix-2.7.2.2/docs/
> System-Posix-Process.html
> but that seems rather low-level - and I don't see how I would
> get the ProcessID of the process started by  readProcess,
> so I'd also have to re-do that.
>
> Is there an abstraction/library that would help here?
>
> Thanks - J.W.
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