From mboxrd@z Thu Jan  1 00:00:00 1970
From: Anatolij Gustschin <agust@denx.de>
Date: Fri, 16 Dec 2011 23:03:02 +0000
Subject: Re: "ls > /dev/fb0" generates weird ioctls if panning is set
Message-Id: <20111217000302.48e92bd9@wker>
List-Id: <linux-fbdev.vger.kernel.org>
References: <4EEBBCEA.9020104@freescale.com>
In-Reply-To: <4EEBBCEA.9020104@freescale.com>
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To: linux-fbdev@vger.kernel.org

On Fri, 16 Dec 2011 16:31:22 -0600
Timur Tabi <timur@freescale.com> wrote:

> Timur Tabi wrote:
> 
> > graphics fb0: unknown ioctl command (0x402C7413)                                                                                                   
> > graphics fb0: dir=2 type='t' (74) nr sizeD                                                                                                    
> > graphics fb0: unknown ioctl command (0x40087468)                                                                                                   
> > graphics fb0: dir=2 type='t' (74) nr4 size=8                                                                                                    
> > graphics fb0: unknown ioctl command (0x402C7413)                                                                                                   
> > graphics fb0: dir=2 type='t' (74) nr sizeD   
> 
> I figured it out.  These ioctls are:
> 
> #define TCGETS		_IOR('t', 19, struct termios)
> #define TIOCGWINSZ	_IOR('t', 104, struct winsize)
> 
> I'm guessing that since I redirect stdout to /dev/fb0, Linux is
> treating /dev/fb0 as a terminal, and therefore it's receiving
> terminal ioctls.
> 
> Is this something that fbdev should be supporting, or am I wrong
> to use /dev/fb0 as a terminal?

No. Do not redirect to /dev/fb0, use /dev/tty1 instead.

Anatolij