From: Eli Zaretskii <eliz@gnu.org>
To: emacs-devel@gnu.org
Subject: Re: Redirecting standard output
Date: Fri, 22 Apr 2011 01:50:47 -0400 [thread overview]
Message-ID: <E1QD9GR-0006Vv-OE@fencepost.gnu.org> (raw)
In-Reply-To: <m3ipu7l7td.fsf@quimbies.gnus.org> (message from Lars Magne Ingebrigtsen on Thu, 21 Apr 2011 21:31:58 +0200)
> From: Lars Magne Ingebrigtsen <larsi@gnus.org>
> Date: Thu, 21 Apr 2011 21:31:58 +0200
>
> Davis Herring <herring@lanl.gov> writes:
>
> > You can call `pipe' more than once; the trouble comes when you have to
> > choose which one to read from to avoid blocking the process. Probably
> > it's just that no one has bothered to implement it carefully enough with
> > `select' or so.
>
> Oh, I see... I was a bit confused about how pipe worked. Yes, that
> makes sense. Just hook up the STDERR endpoint to a pipe, too, and
> you're in business.
>
> For the MSDOS case (with STDERR-to-buffer), we'd just have to open
> another temp file, just like we do with STDOUT, so that's a very minor
> change.
>
> For the non-MSDOS case, using two pipes and select shouldn't be too
> difficult to implement, I think?
You are in danger of reinventing the wait_reading_process_output
wheel. I'm not sure that kind of complexity is justified for such a
marginal need, just for the sake of theoretical completeness and/or
symmetry between stdout and stderr. I think redirecting to a
temporary file and then reading from there is more than adequate, and
all but indistinguishable from the user POV (since we wait for the
process to exit anyway).
> Or are there gotchas when using select in Emacs?
wait_reading_process_output already uses select, so adding another one
is probably not a good idea.
next prev parent reply other threads:[~2011-04-22 5:50 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-20 21:19 Redirecting standard output Lars Magne Ingebrigtsen
2011-04-20 22:54 ` Stefan Monnier
2011-04-21 1:54 ` Lars Magne Ingebrigtsen
2011-04-21 6:10 ` Eli Zaretskii
2011-04-21 11:45 ` Lars Magne Ingebrigtsen
2011-04-21 13:25 ` Lars Magne Ingebrigtsen
2011-04-21 14:10 ` Eli Zaretskii
2011-04-21 15:15 ` Lars Magne Ingebrigtsen
2011-04-21 15:46 ` Lars Magne Ingebrigtsen
2011-04-21 16:15 ` Eli Zaretskii
2011-04-21 16:22 ` Lars Magne Ingebrigtsen
2011-04-21 16:24 ` Lars Magne Ingebrigtsen
2011-04-21 16:55 ` Eli Zaretskii
2011-04-21 17:05 ` Jan Djärv
2011-04-21 19:15 ` Eli Zaretskii
2011-04-21 19:19 ` Davis Herring
2011-04-21 19:31 ` Lars Magne Ingebrigtsen
2011-04-22 5:50 ` Eli Zaretskii [this message]
2011-04-23 18:46 ` Lars Magne Ingebrigtsen
2011-04-23 20:10 ` Eli Zaretskii
2011-04-24 8:30 ` Jan Djärv
2011-04-30 23:58 ` Lars Magne Ingebrigtsen
2011-05-01 0:06 ` Lars Magne Ingebrigtsen
2011-05-01 17:56 ` Andy Moreton
2011-05-07 11:34 ` Eli Zaretskii
2011-05-07 12:10 ` Eli Zaretskii
2011-05-30 17:39 ` Lars Magne Ingebrigtsen
2011-04-21 16:29 ` Glenn Morris
2011-04-21 8:27 ` Michael Albinus
2011-04-21 5:57 ` Eli Zaretskii
2011-04-21 6:28 ` Thierry Volpiatto
2011-04-21 6:41 ` Eli Zaretskii
2011-04-21 7:33 ` Thierry Volpiatto
2011-04-21 11:40 ` Lars Magne Ingebrigtsen
2011-04-21 11:58 ` Eli Zaretskii
2011-04-21 12:24 ` Lars Magne Ingebrigtsen
2011-04-21 14:25 ` Lars Magne Ingebrigtsen
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