linux-kernel - Re: Question on tty line discipline

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Message-ID: <20070228153702.0e172fa1@lxorguk.ukuu.org.uk>
Date:	Wed, 28 Feb 2007 15:37:02 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Christopher Meller <cmeller@...ominate.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Question on tty line discipline

On Wed, 28 Feb 2007 14:47:12 +0100
Christopher Meller <cmeller@...ominate.com> wrote:

> Hi,
> 
> I have a question concerning the line discipline behaviour for serial
> devices.
> When the line discipline is set via ioctl from  user space to e.g. N_PPP and the userspace program returns without resetting  the line discipline back to N_TTY, the serial device cannot be used (ENODV) until an appropriate  ioctl (to N_TTY) is performed. Is there any reason for the fact that the line discipline is not reset by the kernel , when closing the device. 

No special reason, it has simply always been that way. Getty and friends
are expected to put the tty back into a sane state.
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