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From: cudcv@warwick.UUCP
Newsgroups: comp.unix.wizards
Subject: Re: how do I make a process release its terminal?
Message-ID: <323@sol.warwick.ac.uk>
Date: Wed, 28-Jan-87 08:08:46 EST
Article-I.D.: sol.323
Posted: Wed Jan 28 08:08:46 1987
Date-Received: Sun, 1-Feb-87 16:08:02 EST
References: <118@lmi-angel.UUCP>
Reply-To: cudcv@sol.warwick.ac.uk (Rob McMahon)
Distribution: world
Organization: Computing Services, Warwick University, UK
Lines: 36

In article <118@lmi-angel.UUCP> wsr@lmi-angel.UUCP (Wolfgang Rupprecht) writes:
|In article <> paul@vixie.UUCP (Paul Vixie Esq) writes:
|>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?
|
|try this:
|
|#include <sys/ioctl.h>
|
|fromlimbo ()
|{
|    int     f;
|
|    if ((f = open ("/dev/tty", 2)) >= 0)
|    {
|	ioctl (f, TIOCNOTTY, 0);
|	close (f);
|    }
|    else
|	perror ("open");
|}
|--
|Wolfgang Rupprecht	{harvard|decvax!cca|mit-eddie}!lmi-angel!wsr

I would have thought the 'else perror(...);' was undesirable.  If you can't
open /dev/tty it probably means you're already without a controlling terminal
and the ioctl is simply unecessary.  Don't you want a

        setpgrp(getpid());

after that, too, to fully dissociate it from the terminal (otherwise when you
hit ^C, you'll still get the signal).
-- 
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Rob McMahon, Computing Services, Warwick University, Coventry CV4 7AL, England