# # How can I prevent a certain tty from being used? (SCO Unix)
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© December 2003 (various)

This article is from a FAQ concerning SCO operating systems. While some of the information may be applicable to any OS, or any Unix or Linux OS, it may be specific to SCO Xenix, Open This is an old article about SCO Unix and is only left here for historical purposes. There is lots of Linux, Mac OS X and general Unix info elsewhere on this site: Search this site is the best way to find anything.

How can I prevent a certain SCO Unix tty from being used?

(From a newsgroup post by Bela Lubkin):
 From: Bela Lubkin <[email protected]>
 Subject: Re: busying out a pseudo tty
 Date: 2 Oct 2003 17:31:04 -0400
 References: <[email protected]>
 
 PW Herman wrote:
 
 > Hi, I've got a weird problem with an old un-supported dentist program
 > that runs on Openserver 5.0.4.  For some reason, it gives error
 > messages in certain menus if the user logs in on ttyp2, ttyp3, ttyp4
 > or ttyp5.  Is there any way to make these 4 pseudo ttys appear to be
 > busy so nobody ever connects on them???
 
 If you open the master sides (/dev/ptyp2 etc.), they will be busied out.
 You can do that with a very simple shell script that you could e.g. run
 as an rc script.  For example,
 
   #!/bin/sh
 
   # Busy out ports ttyp2, 3, 4, 5 because "un-supported dentist program"
   # is allergic to them...
 
   sleep 1000000000 < /dev/ptyp2 &
   sleep 1000000000 < /dev/ptyp3 &
   sleep 1000000000 < /dev/ptyp4 &
   sleep 1000000000 < /dev/ptyp5 &
 
 Save as /etc/rc2.d/S99pty-hold or something like that.
 
 You can save a few processes if you wish (but this gets messy if you
 want to busy out dozens of ports):
 
   cd /dev
   sleep 1000000000 2<ptyp2 3<ptyp3 4<ptyp4 5<ptyp5 &
   # Note that shell syntax allows redirecting fd's 0-9, no higher: 10<
   # does not work.
 
 >Bela<
 
 

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