From: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: Proposal for extending set-process-filter
Date: 27 Apr 2004 14:51:59 -0400 [thread overview]
Message-ID: <jwv7jw1cl7w.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <x5hdv54er4.fsf@lola.goethe.zz>
>> > 3) a file name for output.
>> Can be handled by (1) just fine. What would you use it for (other than
>> /dev/null which is rather special since append is the same as overwrite)?
> Consistency with the BUFFER argument of start-process (which would be
> pretty much the same as the FILTER function, with the exception that
> it establishes a control buffer that is the default for process
> output, that will list the process as one of its processes, and that
> will kill the process if the buffer gets killed). Also efficiency:
> redirecting a file descriptor to a file does not require Emacs
> processing power. It also does not require conversion into multibyte
> strings and back and so on.
AFAIK, you can't do such a redirection after the exec. I.e. it has to be an
argument of `start-process' rather than set-process-filter.
>> Output-appending can be done via a filter-function.
> Not really. An open in append mode will also append at the end if
> the file gets extended by a different process. That's pretty hard to
> do with a filter function. One could start the file descriptor list
> with
> :append t
> or so, however.
I thought the `append' arg of write-region did it right.
>> What is still missing is the ability to open more file descriptors
>> than stdin, stdout, stderr.
> Item 5) above was supposed to cater for that.
But for the same reason as above I don't think this can be done in
set-process-filter: it has to be done before the `exec'.
Stefan
next prev parent reply other threads:[~2004-04-27 18:51 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-26 23:55 Proposal for extending set-process-filter David Kastrup
2004-04-27 15:01 ` Stefan Monnier
2004-04-27 15:33 ` David Kastrup
2004-04-27 18:51 ` Stefan Monnier [this message]
2004-04-27 20:46 ` David Kastrup
2004-04-27 16:30 ` Richard Stallman
2004-04-27 18:53 ` Stefan Monnier
2004-04-27 20:59 ` David Kastrup
2004-04-29 10:44 ` Richard Stallman
2004-04-27 21:10 ` David Kastrup
2004-04-27 21:25 ` Stefan Monnier
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