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From: rich@GATEWAY.MITRE.ORG
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Date: 3 Aug 90 11:47:20 GMT
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Date: Fri, 03 Aug 90 07:40:16 -0400
From: rich

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To: snorkelwacker!tut.cis.ohio-state.edu!zaphod.mps.ohio-state.edu!samsu
    ng!rex!ukma!chaney@bloom-beacon.mit.edu (Dan Chaney)
cc: xpert@expo.lcs.mit.edu rich
Subject: Re: xdm and /dev/console windows.... 
In-reply-to: Your message of 02 Aug 90 20:29:55 +0000.
             <15752@s.ms.uky.edu> 
- - --------
>	I need to associate a window with /dev/console in order to
>prevent cron, et al. from goofing up my root X window (background).
>I'm running a Sun 4.0.1 Sparc 1+ (if that matters) with the standard 
>X stuff and xdm.  I've heard there was a way to start a window as 
>/dev/console (thus taking away all the output piped to /dev/console...)

I have also wanted to do something similar.  I wanted to know if I can open
a window and associate it with a particular ttyp device other than the
console?

I want a process that is spawned by a deamon process to write to a
specific window, but I do not want to use the Xlib to have the process
open a window.
I just want to use xterm to open a window in the background and associate that
window with, say /dev/ttyp5, and then open a file descriptor to /dev/ttyp5 in
my C program and use fprintf().

There is an option to xterm, -Sccn which according to the X Window System User's
Guide "Specifies the last two letters of the name of a pseudo-terminal to use
in slave mode.  This allows xterm to be used as an input and output channel
for an existing program..."

X11 man page says that "this allows xterm to be used as an input and
output channel for an existing program and is sometimes used in
specialized applications".

The xterm -help information is a little more specific.  It decribes the
- - -Sxxd option as "slave mode on 'ttyxx', file descriptor 'd'".

I could not get this option to work...

Does anyone know how to actually use this option?  Does "slave mode" refer
to the parent/child relationship of two processes? Or does it mean something
else?

Thanks,
Rich
- - -----------------------------------------------------------
rich@gateway.mitre.org               aTdHvAaNnKcSe   :-)

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