Re: "ls > /dev/fb0" generates weird ioctls if panning is set

On Fri, 16 Dec 2011 16:31:22 -0600
Timur Tabi [off-list ref] wrote:

Timur Tabi wrote:

quoted

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