Noam Postavsky <npostavs@HIDDEN>
to control <at> debbugs.gnu.org
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Full text available.npostavs@HIDDEN
to control <at> debbugs.gnu.org
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Full text available.Noam Postavsky <npostavs@HIDDEN>
to control <at> debbugs.gnu.org
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Full text available.Received: (at submit) by debbugs.gnu.org; 9 Nov 2015 02:03:47 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sun Nov 08 21:03:47 2015 Received: from localhost ([127.0.0.1]:58002 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1ZvboA-0004Ot-QB for submit <at> debbugs.gnu.org; Sun, 08 Nov 2015 21:03:47 -0500 Received: from eggs.gnu.org ([208.118.235.92]:53043) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <npostavs@HIDDEN>) id 1Zvbo8-0004Ol-Mv for submit <at> debbugs.gnu.org; Sun, 08 Nov 2015 21:03:45 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <npostavs@HIDDEN>) id 1Zvbo7-0002M0-1w for submit <at> debbugs.gnu.org; Sun, 08 Nov 2015 21:03:44 -0500 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.8 required=5.0 tests=BAYES_50,FREEMAIL_FROM, T_DKIM_INVALID autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:37192) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <npostavs@HIDDEN>) id 1Zvbo6-0002Lu-VU for submit <at> debbugs.gnu.org; Sun, 08 Nov 2015 21:03:42 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34796) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <npostavs@HIDDEN>) id 1Zvbo5-00081x-P0 for bug-gnu-emacs@HIDDEN; Sun, 08 Nov 2015 21:03:42 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <npostavs@HIDDEN>) id 1Zvbo4-0002Ji-Am for bug-gnu-emacs@HIDDEN; Sun, 08 Nov 2015 21:03:41 -0500 Received: from mail-io0-x22b.google.com ([2607:f8b0:4001:c06::22b]:36279) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <npostavs@HIDDEN>) id 1Zvbo4-0002Hz-5R for bug-gnu-emacs@HIDDEN; Sun, 08 Nov 2015 21:03:40 -0500 Received: by iofh3 with SMTP id h3so5147077iof.3 for <bug-gnu-emacs@HIDDEN>; Sun, 08 Nov 2015 18:03:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:date:message-id:subject:from:to:content-type; bh=3LJz6QbxkL9xrPqBssz7ywIBZcE/zAoeJdW68ZNHIEY=; b=beK3O3WfMC0dvaaKWrG8hCwg+o2wQLpwy5G+QUIuBAz3Rr0opkvrGa2/5QUy2yRWPp Fjgh2vep4ZQP4KAgVFPlASz0O/oADF5PejC64y/1/Eu3qH8e1MxJ8BLZdyZFkkUG0SD3 ejp3B+KCih0bu3R8eKcyU1sAM/4JfMGX3oH96+8m1F15dKr5ruw4YcOhfsI8L2YFhSmr 4rLvQLlGXBku4BZrOSeaBZgUmcr6wU9gqobLtp+VMs4S6d92s+aom6VFMVkKF/s2+L5b 9FevUPu3fcB832DH6w6V38pPD3LrFrf4d1M+85bfKTDxnM/VrW1SnAzlOzMVbDNlBJe9 h13w== MIME-Version: 1.0 X-Received: by 10.107.7.210 with SMTP id g79mr18146634ioi.81.1447034618929; Sun, 08 Nov 2015 18:03:38 -0800 (PST) Received: by 10.79.119.2 with HTTP; Sun, 8 Nov 2015 18:03:38 -0800 (PST) Date: Sun, 8 Nov 2015 21:03:38 -0500 X-Google-Sender-Auth: iOodNOU8txKWuKCMbiUGJgZrGOs Message-ID: <CAM-tV-9Fx3CNFFQzPh7f75qFe6eRKYUrozrnpeuFO5hrrxwiWg@HIDDEN> Subject: How to stop children of pty subprocesses from receiving a SIGHUP when main subprocess exits? From: Noam Postavsky <npostavs@HIDDEN> To: bug-gnu-emacs@HIDDEN Content-Type: text/plain; charset=UTF-8 X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -4.0 (----) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -4.0 (----) 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
Noam Postavsky <npostavs@HIDDEN>
:bug-gnu-emacs@HIDDEN
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Full text available.bug-gnu-emacs@HIDDEN
:bug#21866
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