From: Eli Zaretskii <eliz@gnu.org>
To: sbaugh@catern.com
Cc: emacs-devel@gnu.org
Subject: Re: Using file descriptors in Emacs
Date: Sun, 11 Sep 2016 18:28:11 +0300 [thread overview]
Message-ID: <83d1kabgms.fsf@gnu.org> (raw)
In-Reply-To: <87twdn25ib.fsf@earth.catern.com> (sbaugh@catern.com)
> From: sbaugh@catern.com
> Date: Sat, 10 Sep 2016 10:28:44 -0400
>
> > Please elaborate: how are file descriptors required for that? A shell
> > needs to pass file descriptors to the subprocesses it invokes, which
> > AFAIK we already do in the primitives that invoke subprocesses. What
> > else is needed, and how does the feature you propose fit into that?
>
> Two features that I would like to add to eshell (or some shell in Emacs)
> that I believe will require the ability to directly manipulate file
> descriptors:
>
> - Piping data to and from processes without that data round-tripping through
> Emacs, which is necessary if I want to write a pipeline processing any
> significant amount of data (which I frequently do in even casual shell
> use)
> - Redirecting higher file descriptors than 0/1/2 (that is, when creating
> a process, before forking, use dup2 to rearrange what file descriptors are
> in what slots)
>
> Of the two, the first is more important, but I think the second is also
> necessary.
It sounds like none of these two features need file descriptors to be
exposed to Lisp. Both of these sound like extensions of
start-process, and the descriptors could be dealt with entirely on the
C level, as applications shouldn't care about them. Am I missing
something?
next prev parent reply other threads:[~2016-09-11 15:28 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-07 1:25 Teaching emacsclient to act as a pager, and more Spencer Baugh
2016-06-07 1:25 ` [PATCH 1/5] process: add features for direct use of FDs Spencer Baugh
2016-06-07 1:25 ` [PATCH 2/5] server.el: accept FDs from emacsclient Spencer Baugh
2016-06-07 1:25 ` [PATCH 3/5] emacsclient: support passing stdin/out/err to emacs Spencer Baugh
2016-06-07 1:25 ` [PATCH 4/5] server: add pager tapping and show-active Spencer Baugh
2016-06-07 1:25 ` [PATCH 5/5] emacsclient: add extra-quiet mode Spencer Baugh
2016-06-08 15:51 ` Teaching emacsclient to act as a pager, and more Tassilo Horn
2016-06-08 16:13 ` Anders Lindgren
2016-06-08 17:30 ` Tassilo Horn
2016-06-09 0:25 ` raman
2016-06-09 11:31 ` H. Dieter Wilhelm
2016-06-27 22:42 ` Ole JørgenBrønner
2016-07-24 18:22 ` sbaugh
2016-09-09 13:42 ` Noam Postavsky
2016-09-09 14:14 ` sbaugh
2016-09-09 14:59 ` Stefan Monnier
2016-09-09 15:58 ` sbaugh
2016-09-09 19:26 ` Stefan Monnier
2016-09-09 19:42 ` Eli Zaretskii
2016-09-09 21:13 ` sbaugh
2016-09-10 6:37 ` Using file descriptors in Emacs (was: Teaching emacsclient to act as a pager, and more) Eli Zaretskii
2016-09-10 20:15 ` Teaching emacsclient to act as a pager, and more sbaugh
2016-09-11 2:11 ` Leo Liu
2018-02-16 23:14 ` Kaushal Modi
2018-02-17 15:46 ` Göktuğ Kayaalp
2016-09-09 15:53 ` Eli Zaretskii
2016-09-09 17:16 ` sbaugh
2016-09-09 18:50 ` Eli Zaretskii
2016-09-09 19:03 ` sbaugh
2016-09-09 19:26 ` Eli Zaretskii
2016-09-09 20:38 ` sbaugh
2016-09-10 7:12 ` Using file descriptors in Emacs Eli Zaretskii
2016-09-10 14:28 ` sbaugh
2016-09-11 15:28 ` Eli Zaretskii [this message]
2016-09-11 16:00 ` sbaugh
2016-09-11 16:39 ` Eli Zaretskii
2016-09-11 16:57 ` sbaugh
2016-09-11 17:13 ` Eli Zaretskii
2016-09-12 15:40 ` Davis Herring
2016-09-09 13:27 ` Teaching emacsclient to act as a pager, and more sbaugh
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