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Date: Mon, 17 Mar 2003 19:56:07 +0000
From: Jamie Lokier <jamie@shareable.org>
To: "Richard B. Johnson" <root@chaos.analogic.com>
Cc: Linux kernel <linux-kernel@vger.kernel.org>
Subject: Re: Linux-2.4.20 modem control
Message-ID: <20030317195607.GB11881@mail.jlokier.co.uk>
References: <Pine.LNX.4.53.0303171116160.22652@chaos>
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Richard B. Johnson wrote:
> Now, the hang-up sequence appears to be queued. It can (and does)
> happen after the previous terminal owner has expired and another
> owner has opened the device. This makes /dev/ttyS0 useless for remote
> log-ins.
> 
> It needs to be, that a 'close()' of a terminal, configured as a modem,
> cannot return to the caller until after the DTR has been lowered, and
> preferably, after waiting a few hundred milliseconds. Without this,
> once logged in, the modem will never disconnect so a new caller
> can't log in.

Better would be if the hang-up sequence is still queued, but a new
open() is delayed until the hangup has completed.

-- Jamie
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