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From: guido@gvr.win.tue.nl (Guido van Rooij)
Newsgroups: comp.os.386bsd.misc
Subject: Re: Using the sio ports with a Modem
Date: 4 Aug 1993 18:06:26 GMT
Organization: Eindhoven University of Technology, The Netherlands
Lines: 41
Message-ID: <23otr2$puk@wzv.win.tue.nl>
References: <1993Aug3.092159.1696@cnplss5.cnps.philips.nl> <CB76y1.3xG@sugar.NeoSoft.COM> <1993Aug4.072326.27151@cnplss5.cnps.philips.nl> <CB8G2w.B7v@sugar.NeoSoft.COM>
NNTP-Posting-Host: gvr.win.tue.nl
peter@NeoSoft.com (Peter da Silva) writes:
>In article <1993Aug4.072326.27151@cnplss5.cnps.philips.nl> rooij@bashful.isp.cft.philips.nl (Guido van Rooij) writes:
>> peter@NeoSoft.com (Peter da Silva) writes:
>> >I'm sorta confused here about the semantics. If clocal is set, the value
>> >of DCD is ignored, so how do you ever get signal delivery? Don't you need
>> You are right, I meant if clocal is clear.
>> >to clear clocal *and* set the control terminal?
>> No, look in tty.c, function ttymodem().
>I'll do that, but I'm really talking in a broader philosophical sense. So far
>as I can recall, you've never been able to get a SIGHUP on any version of UNIX
Oopps..I was mistaken:
if (tp->t_state&TS_ISOPEN && (tp->t_cflag&CLOCAL) == 0) {
if (tp->t_session && tp->t_session->s_leader)
psignal(tp->t_session->s_leader, SIGHUP);
But what is strange (I think) is that TS_CARR_ON is always cleared when
the carrier is lost, and not only when carrier lost and -clocal.
>unless both of those conditions are true. It's not clear to me what the effects
>of sending SIGHUP to other processes than the ones in the process group for
>that terminal are.
>For example, if I'm dialed in via one modem, dial out via another, how does
>it know which line hung up?
>--
>Peter da Silva. <peter@sugar.neosoft.com>.
> `-_-' Hefur thu fadhmadh ulfinn i dag?
> 'U`
>"Det er min ledsager, det er ikke drikkepenge."
-Guido
--
Guido van Rooij | Internet: guido@gvr.win.tue.nl
Bisschopsmolen 16 | Phone: ++31.40.461433
5612 DS Eindhoven | ((12+144+20)+3*sqrt(4))/7
The Netherlands | +(5*11)=9^2+0