linux-kernel - Re: compat

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Date:	27 Apr 2007 02:38:56 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Paul Fulghum <paulkf@...rogate.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: compat_ioctl question

Paul Fulghum <paulkf@...rogate.com> writes:
> 
> 1. define compat_ioctl() file operation for device and
>     implement translation code in individual driver
> 2. add COMPATIBLE_IOCTL entry to include/linux/compat_ioctl.h
>     to mark an ioctl code as the same in any environment
> 3. add HANDLE_IOCTL entry to fs/compat_ioctl.c with translation code
>     implemented in the same file
> 
> There is no way to implement #1 for a tty driver without
> modifying the kernel tty code to allow registration of a
> compat_ioctl() handler.

(1) is really the recommended solution for all new code

I would recommend you modify the tty driver to pass compat_ioctl
through through. Should not do very hard.

-Andi
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