GNU bug report logs - #57199
29.0.50; Processes spawned by Emacs become zombie after restarting

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From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Akib Azmain Turja <akib <at> disroot.org>
Cc: 57199 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: bug#57199: 29.0.50; Processes spawned by Emacs become zombie after restarting
Date: Mon, 15 Aug 2022 09:11:44 +0200

Akib Azmain Turja <akib <at> disroot.org> writes:

> IIUC, Emacs sends SIGHUP (from kill_buffer_processes in process.c) to
> all child processes to kill them just before exiting (or restarting),
> and Tor uses that signal as the reload signal.

[...]

> How can a process resist being killed?  SIGKILL is lethal, always.  Why
> kill-emacs sends SIGHUP while kill-process and delete-process sends
> SIGKILL?

Because we want processes started by Emacs to be allowed to shut down
gracefully upon Emacs exit, but with explicit `kill-process', we don't
care about that as much.

So the problem here is that you're starting a process that responds to
SIGHUP by not shutting down, and I don't think there's anything we can
do on the Emacs side to help with that.  Perhaps you can write a wrapper
script that does the right thing on HUP.

But I don't think there's anything to be done on the Emacs side here, so
I'm closing this bug report.

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