From: tdavis@beeble.omahug.org (Thomas Davis) Subject: Re: What logs off? Date: 28 Dec 1992 19:03:30 GMT
torvalds@klaava.Helsinki.FI (Linus Torvalds) writes:
>In article <BzvxEC.7sz@citrus.SAC.CA.US> qumqats@citrus.SAC.CA.US ( Joel M. Baldwin ) writes:
>>
>>I have to echo this question. I'm running SLS 0.98pl1 with the
>>0.98.pl4 kernel and I've noticed that if someone just hangs up
>>without logoff then they're >NOT< logged off. It looks like the
>>controling process is terminated, but if they're in a child process
>>then the parent is just left hanging.
>>
>>Is this a bug in the kernel or in init or what?
>>
>>I consider it a pretty serious problem for a public access system to not
>>have a user logged off when they hang up the phone for whatever reason!
[deleted text]
>You should also make sure that
> - the tty should have the CLOCAL flag cleared (CLOCAL is used to
> indicate that you are running a local serial line without hangup
> detection).
> - your modem is set up correctly to drop DCD when carrier is lost.
Also, I've set my modem to reset/hangup when DTR is dropped.. This makes
damn sure the modem hangs up, and returns to a know state..
>Additionally, for extra safety you can use a 'login' binary that does a
>vhangup() when a new person logs in: that will kill any pending
>processes on that tty.
And because of the previous, my modem now hangs up when ever somebody
logins over the phone line (I actually edited the source to not do it..)
Before you say "well, don't let the modem hang up when DTR is dropped!",
remember, I've set this config up on SunOS, and it worked..
I guess I'm looking for a way for vhangup() to work without dropping dtr
(I've looked at the serial drivers.. They have changed some since I've
last worked on them.. (It's great to see some of the stuff I did still around
though..))
Any suggestions? I'm open for ideas..
-- Thomas Davis, ECNE | Internet: tdavis@beeble.omahug.org Systems Engineer, | UUCP: uunet!ivgate!beeble!tdavis Huntel Communications, Inc. | Snail Mail: 8803 Webster Plaza Omaha, NE | Omaha, NE 68114