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From: David Kastrup <dak@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: request for review: Doing direct file I/O in Emacs Lisp
Date: 10 May 2004 10:27:16 +0200	[thread overview]
Message-ID: <x51xlsofff.fsf@lola.goethe.zz> (raw)
In-Reply-To: <m2d65cx1ow.fsf@Majnun.local>

John Wiegley <johnw@gnu.org> writes:

> The following patch implements a file-handle interface for Emacs Lisp,
> which allows files to be directly opened and read/written to without
> an intervening buffer.  Eshell can now use this, for example, to
> greatly speed up output redirection (by several orders of magnitude).
> 
> It is a simple interface that reads in strings, given a length, and
> writes strings by examining their length:
> 
>   (let ((handle (file-handle-open "/tmp/some-file" "w")))
>     (file-handle-write handle "Test data\n")
>     (file-handle-close handle)
> 
>     (setq handle (file-handle-open "/tmp/some-file" "r"))
>     (message (file-handle-read handle 128))
>     (file-handle-close handle))
> 
> Please post comments here, or mail them to johnw@gnu.org.

I had posted a proposal to change start-process instead some time ago
that would have allowed for efficient I/O redirection under eshell.
Have you seen that proposal?  That would be, IMO, a much more Emacsy
solution.  The above looks like being quite ugly low level.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum

  parent reply	other threads:[~2004-05-10  8:27 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-05-10  5:59 request for review: Doing direct file I/O in Emacs Lisp John Wiegley
2004-05-10  6:52 ` Kim F. Storm
2004-05-10  8:27 ` David Kastrup [this message]
2004-05-10 14:21   ` Stefan Monnier
2004-05-10 15:59     ` David Kastrup
2004-05-10 16:36       ` Stefan Monnier
2004-05-10 17:00         ` David Kastrup
2004-05-10 17:22           ` Stefan Monnier
2004-05-11  9:23   ` John Wiegley
2004-05-11 10:22     ` David Kastrup
2004-05-10  9:38 ` Andreas Schwab
2004-05-10 11:29   ` Eli Zaretskii
2004-05-10 11:23     ` Andreas Schwab
2004-05-10 15:04       ` Eli Zaretskii
2004-05-10 14:19 ` Stefan Monnier
2004-05-10 17:46   ` Oliver Scholz
2004-05-10 18:21     ` Stefan Monnier
2004-05-10 22:40       ` Oliver Scholz
2004-05-11 12:22     ` Richard Stallman
2004-05-10 17:54 ` Richard Stallman
2004-05-11  9:20   ` John Wiegley
2004-05-12 19:41     ` Richard Stallman
2004-05-13  7:59       ` Kai Grossjohann
2004-05-14  9:21         ` Richard Stallman
2004-05-14 10:42           ` Kai Grossjohann
2004-05-15  8:53             ` Richard Stallman
2004-05-15 16:27               ` Kai Grossjohann
2004-05-16 13:20                 ` Richard Stallman
2004-05-14 21:43           ` John Wiegley
2004-05-15 18:33             ` Richard Stallman
2004-05-15 21:36               ` John Wiegley
2004-05-15 22:13                 ` David Kastrup
2004-05-16  6:41                   ` Eli Zaretskii
2004-05-16 17:46                     ` David Kastrup
2004-05-17 11:04                 ` Richard Stallman
2004-05-13 22:50       ` John Wiegley
2004-05-14 21:02         ` Richard Stallman

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