From: Eli Zaretskii <eliz@gnu.org>
To: Lars Ingebrigtsen <larsi@gnus.org>
Cc: rgm@gnu.org, 17036@debbugs.gnu.org, schwab@linux-m68k.org, rrt@sc3d.org
Subject: bug#17036: Continuation for Emacs: invoking a process on exit?
Date: Sun, 17 Apr 2022 15:34:55 +0300 [thread overview]
Message-ID: <83wnfnyjkg.fsf@gnu.org> (raw)
In-Reply-To: <87fsmbap4e.fsf@gnus.org> (message from Lars Ingebrigtsen on Sun, 17 Apr 2022 14:08:49 +0200)
> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: rgm@gnu.org, 17036@debbugs.gnu.org, schwab@linux-m68k.org, rrt@sc3d.org
> Date: Sun, 17 Apr 2022 14:08:49 +0200
>
> Eli Zaretskii <eliz@gnu.org> writes:
>
> > As implemented, it won't work reliably on MS-Windows, because execvp
> > there doesn't do what you think it should. I think we should use
> > sys_spawnve instead.
>
> Ah, I grepped for execvp to see whether we already used it, but didn't
> notice that the hits were from Gnulib.
>
> I'm not familiar with sys_spawnve -- can you do the adjustments?
I don't think I will have the time. It isn't a simple job, because
just calling sys_spawnve will not do -- that function currently
supports only Emacs sub-processes.
FTR, I will document below the potential issues with the current
implementation of kill-emacs/restart-emacs:
. when kill-emacs is called with RESTART non-nil, the value of ARG
is ignored; this should at least be documented;
. the exit status of the restarted Emacs is discarded, so it will
not be available to the parent program, at least on MS-Windows,
and also if execvp fails for some reason;
. the semantics of the file descriptors open in the original Emacs
process is not clear to me: will they remain open in the restarted
Emacs, if the original Emacs opened them without CLOEXEC?
. does the restarted Emacs belong to the same process group? should
it?
. on MS-Windows, if any of the argv[] command-line arguments have
embedded whitespace, the restarted Emacs will not get the same
elements in its argv[] array, because the Windows API for starting
processes accepts the command-line arguments as a single string
next prev parent reply other threads:[~2022-04-17 12:34 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-18 22:47 bug#17036: Continuation for Emacs: invoking a process on exit? Reuben Thomas
2014-03-18 22:52 ` Andreas Schwab
2014-03-18 22:56 ` Reuben Thomas
2014-03-19 6:27 ` Glenn Morris
2014-03-19 13:10 ` Stefan
2014-03-19 13:19 ` Reuben Thomas
2014-03-19 16:51 ` Eli Zaretskii
2014-03-19 21:14 ` Reuben Thomas
2014-03-20 3:45 ` Eli Zaretskii
2014-03-20 12:02 ` Reuben Thomas
2014-03-20 17:43 ` Eli Zaretskii
2014-03-20 23:10 ` Reuben Thomas
2014-03-21 7:53 ` Eli Zaretskii
2014-03-21 10:09 ` Reuben Thomas
2014-03-21 10:18 ` Reuben Thomas
2014-03-21 10:18 ` Eli Zaretskii
2014-03-21 10:25 ` Reuben Thomas
2022-04-17 11:38 ` Lars Ingebrigtsen
2022-04-17 11:56 ` Reuben Thomas via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-04-17 11:57 ` Eli Zaretskii
2022-04-17 12:08 ` Lars Ingebrigtsen
2022-04-17 12:34 ` Eli Zaretskii [this message]
2022-04-17 12:41 ` Eli Zaretskii
2022-04-17 12:52 ` Lars Ingebrigtsen
2022-04-17 12:49 ` Lars Ingebrigtsen
2022-04-17 14:37 ` Eli Zaretskii
2022-04-17 14:49 ` Lars Ingebrigtsen
2022-04-17 15:51 ` Eli Zaretskii
2022-04-18 8:48 ` Lars Ingebrigtsen
2022-04-18 9:28 ` Eli Zaretskii
2022-04-17 14:29 ` Eli Zaretskii
2022-04-17 15:58 ` Eli Zaretskii
2022-04-17 16:02 ` Lars Ingebrigtsen
2022-04-17 17:49 ` Eli Zaretskii
2022-04-18 8:53 ` Lars Ingebrigtsen
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