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Subject: bug#21866: How to stop children of pty subprocesses from receiving a SIGHUP when main subprocess exits?
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While investigating a magit bug[1], we found that when a subprocess
with process-connection-type = pty ends, any subprocesses it has
spawned will receive a SIGHUP.

A simple way to see the problem is doing

   git config --global credential.help='cache --timeout=3600'

And then doing a "git push" to a password protected https remote twice
from M-x eshell. You will be asked for your password both times. The
same from M-x shell only asks the first time (note that after a
successful push from a normal shell, you won't be asked for a password
in eshell either because it can pick up existing daemons, it's just
that it always kills its own daemons).

For a self contained example, using the attached files:

   emacs -Q -l start-process-note-sighup.el

And notice that sighup.log contains "got sigup". Doing the same in
bash, a sighup is not sent if job control is on (the default for
interactive shells).

  xterm -e 'bash -c "set -m ; ./call-note-sighup"' ; cat sighup.log #
no sigup, do pkill note-sighup after
  xterm -e 'bash -c "set +m ; ./call-note-sighup"' ; cat sighup.log # sigup sent

We have a workaround for the git daemon situation, and I'm also
looking into possibly adding an option to git to ignore the sighup[2],
but I think it would make sense for Emacs to be able to avoid sending
sighup in this situation too. I poked around process.c a bit, but I
couldn't figure out where this signal gets sent from.

[1]: https://github.com/magit/magit/issues/2309
[2]: http://www.mail-archive.com/git%40vger.kernel.org/msg79211.html

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To: Noam Postavsky <npostavs@HIDDEN>
Subject: bug#21866: Acknowledgement (How to stop children of pty
 subprocesses from receiving a SIGHUP when main subprocess exits?)
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Subject: How to stop children of pty subprocesses from receiving a SIGHUP when
 main subprocess exits?
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Subject: Re: bug#15695: 24.3;
 multiple async shell commands at once run randomly
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merge 15695 16019
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> If I set process-connection-type to nil, then I get expected results

> This problem is also talked about in [1] and [2].
>
> [1]: http://nullprogram.com/blog/2018/01/17/
> [2]: http://nullprogram.com/blog/2014/02/06/#pseudo-terminals

Actually, I don't think this bug is a problem of Emacs losing data after
all, it's just that the shell does the 'echo baz' and then usually exits
before the other echo commands get to run (when running with a pty,
Emacs sends SIGHUP to all child process in the terminal).  If I add a ";
wait" to the shell command, then I get

"baz\nbar\nfoo\n": 374
"baz\nfoo\nbar\n": 428
"foo\nbaz\nbar\n": 17
"bar\nfoo\nbaz\n": 1

which is as expected.  I'm merging with #16019 which is about Emacs
sending SIGHUP to all child processes of a pty subprocess.

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