From: Benjamin Riefenstahl <b.riefenstahl@turtle-trading.net>
Cc: help-gnu-emacs@gnu.org, Jason Rumney <jasonr@f2s.com>,
Emacs Devel <emacs-devel@gnu.org>
Subject: Re: asynchronous process management on WinWP; buffering problem?
Date: Sat, 15 Apr 2006 19:54:54 +0200 [thread overview]
Message-ID: <m3y7y667wx.fsf@seneca.benny.turtle-trading.net> (raw)
In-Reply-To: <444110BE.3050009@student.lu.se> (Lennart Borgman's message of "Sat, 15 Apr 2006 17:26:54 +0200")
Hi Lennart,
Lennart Borgman writes:
> It actually seems like is _isatty is defined in MinGW. I just tested
> a small program I found here:
The function isatty is defined in the Microsoft C runtime, and that is
what Mingw uses. This version of isatty determines if a program is
running with stdin/stdout connected to an MS Windows console.
The way that consoles are implemented and used in MS Windows makes it
very complicated to use the console API to simulate a terminal in
Emacs. On Unix-like systems this is done by so-called "pseudo-ttys",
"pty", but the MS Windows consoles are quite different beasts at the
OS API level. Emacs would have to do a large amount of
reverse-engineering of the intent of the child process, to do with
consoles what Emacs does quite naturally on Unix with pseudo-ttys, and
there would still be features missing. Therefore Emacs just uses
anonymous pipes instead which are a much better fit for the way Emacs
treats child processes, but that means that it can't make isatty in
child processes return true.
Cygwin can implement pseudo-ttys if it controls the parent as well as
the child, e.g. when you call a Cygwin program from a Cygwin compiled
Emacs. It uses its own conventions to do that which are not
understood by non-Cygwin programs.
Sometimes you have a program that uses isatty to determine if it
should work in interactive mode or not, like the command shells of a
programming language or the some SQL interpreters. In those cases you
will need to find a way put it into interactive mode without the help
of isatty. Sometimes the shell will have a command-line option for
that, in other cases it can be configured after its start.
benny
next prev parent reply other threads:[~2006-04-15 17:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <10m877fael0h3.1kg7y6ljn4qmb$.dlg@40tude.net>
[not found] ` <443fdf5c$1@kcnews01>
[not found] ` <mailman.414.1145041920.9609.help-gnu-emacs@gnu.org>
[not found] ` <877j5r3ogd.fsf@catnip.gol.com>
[not found] ` <mailman.434.1145085136.9609.help-gnu-emacs@gnu.org>
[not found] ` <u8xq7jizt.fsf@jasonrumney.net>
2006-04-15 15:26 ` asynchronous process management on WinWP; buffering problem? Lennart Borgman
2006-04-15 17:54 ` Benjamin Riefenstahl [this message]
2006-04-15 23:50 ` Lennart Borgman
2006-04-17 13:08 ` Benjamin Riefenstahl
2006-04-17 16:02 ` Lennart Borgman
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