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From: m5d@bobkat.UUCP
Newsgroups: comp.unix.wizards
Subject: Re: how do I make a process release its terminal?
Message-ID: <471@bobkat.UUCP>
Date: Mon, 26-Jan-87 10:41:28 EST
Article-I.D.: bobkat.471
Posted: Mon Jan 26 10:41:28 1987
Date-Received: Wed, 28-Jan-87 06:37:08 EST
References: <453@vixie.UUCP>
Reply-To: m5d@bobkat.UUCP (Mike McNally (dlsh))
Distribution: world
Organization: Digital Lynx, Inc; Dallas, TX
Lines: 35

In article <453@vixie.UUCP> paul@vixie.UUCP (Paul Vixie Esq) writes:
>I have a program that forks itself and exits upon running -- its child
>process runs as a daemon forever after.  In 'ps aux', I notice that it
>still shows my tty as its control terminal -- even if I log out and
>back in.
>
>I see that syslogd, inetd, cron, and the rest do NOT show 'co' as their
>control terminal; how do I make this happen for me?
>
>This is (more or less) BSD 4.2, and the program is setuid root.  Thanks...
>-- 
>Paul A. Vixie        {ptsfa, qantel, crash, winfree}!vixie!paul
>329 Noe Street       dual!ptsfa!vixie!paul@ucbvax.Berkeley.EDU
>San Francisco        nike!ptsfa!vixie!paul@seismo.CSS.GOV
>CA  94116            paul@vixie.UUCP     (415) 864-7013

My guess is that the other daemons you mentioned are started in the
"rc" command file.  I think that "init" runs this with no standard file
descriptors, or maybe with /dev/null.  So far as I know, you can't get
rid of the control terminal.  You might try fiddling with the process
group, although the shell will grab the tty back anyway.

All this makes me wonder.  I don't have source; all the stuff I know
I've figured out through conjecture and the documentation.  If I ask a
question, and somebody who has source looks up the answer and posts it,
will the Unix police come and gun us all down?

--
****                                                         ****
**** At Digital Lynx, we're almost in Garland, but not quite ****
****                                                         ****

Mike McNally                                    Digital Lynx Inc.
Software (not hardware) Person                  Dallas  TX  75243
uucp: {texsun,killer,infotel}!pollux!bobkat!m5d (214) 238-7474