Date: Thu, 11 Sep 1997 02:38:09 +0000 (GMT)
From: Terry Lambert <tlambert@primenet.com>
To: nnd@itfs.nsk.su
Cc: current@FreeBSD.ORG
Subject: Re: PPP - why set CLOCAL for server ('-direct' mode) ?
Message-ID: <199709110238.TAA23795@usr05.primenet.com>
In-Reply-To: <5v64df$gsa@news.itfs.nsk.su> from "nnd@itfs.nsk.su" at Sep 10, 97 12:39:11 pm
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> (from small script setted as as user's shell)
> then it sets 'CLOCAL' flag for modem and
> as a result 'ppp' process does'nt received 'SIGHUP'
> on modem's carrier drop.
>
> What is the purpose of such ('CLOCAL') setting
> in '-direct' mode ?
Without correct use of the partial open hack, and a driver that
supports it, without CLOCAL set, the lack of DCD prevents the
process from communicating with the modem in order to configure
it, since the open hangs until the DCD goes high.
An alternative implementation would have a host open succeed with
an O_NDELAY flag on the open, but not put the fd in async mode.
Terry Lambert
terry@lambert.org
---
Any opinions in this posting are my own and not those of my present
or previous employers.
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