linux-kernel - Re: [uml-devel] um: TTY fixes (?)

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Message-ID: <20120607173711.22ae146f@bob.linux.org.uk>
Date:	Thu, 7 Jun 2012 17:37:11 +0100
From:	Alan Cox <alan@...ux.intel.com>
To:	Richard Weinberger <richard@....at>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Boaz Harrosh <bharrosh@...asas.com>,
	user-mode-linux-devel@...ts.sourceforge.net,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, jslaby@...e.cz
Subject: Re: [uml-devel] um: TTY fixes (?)

On Thu, 07 Jun 2012 17:18:37 +0200
Richard Weinberger <richard@....at> wrote:

> Alan, Jiri!
> 
> If I omit ->hangup(), mingetty (And all other getty implementations)
> are unable to open /dev/ttyX. open() returns -EIO.
> Currently I'm testing it on FC12.
> Also if I do something like "echo foo >/dev/tty1" it fails with -EIO.
> And now the strange thing, opening and writing an unknown (unknown to
> this upstart rubbish) tty works. E.g.: echo foo >/dev/tty10.
> 
> Any ideas what's going wrong?

Yes I know exactly what is going on. However getting a more tolerant
behaviour is going to take a couple more kernels.

Alan
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