Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!uwm.edu!cs.utexas.edu!uunet!virtech!cpcahil
From: cpcahil@virtech.uucp (Conor P. Cahill)
Newsgroups: comp.unix.wizards
Subject: Re: How to set control tty (Sys5)
Message-ID: <1990Jul06.015108.14622@virtech.uucp>
Date: 6 Jul 90 01:51:08 GMT
References: <483@trux.UUCP>
Reply-To: cpcahil@virtech.UUCP (Conor P. Cahill)
Organization: Virtual Technologies Inc., Sterling VA
Lines: 16

In article <483@trux.UUCP> car@trux.UUCP (Chris Rende) writes:
>However, I can't figure/find out how to set the control tty. I read in
>TERMIO(7) something like "The first terminal file that gets opened becomes
>the control terminal". When I wrote a program that disassociates itself from
>the control terminal and then does a "fd=open("/dev/ttyi00",O_RDWR);"
>it didn't work. I.e, a "ps -ef" shows "?" for the control tty.

The other requirement is that no other proces has that terminal as its 
controlling terminal.  I would guess that your test is failing because
the tty is the controlling terminal for another process.


-- 
Conor P. Cahill            (703)430-9247        Virtual Technologies, Inc.,
uunet!virtech!cpcahil                           46030 Manekin Plaza, Suite 160
                                                Sterling, VA 22170