linux-kernel - Re: How can I create or read/write a file in linux device driver?

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Message-ID: <Pine.LNX.4.61.0701121158460.17236@yvahk01.tjqt.qr>
Date:	Fri, 12 Jan 2007 11:59:39 +0100 (MET)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Jesper Juhl <jesper.juhl@...il.com>
cc:	congwen <congwen@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: How can I create or read/write a file in linux device driver?


On Jan 12 2007 11:54, Jesper Juhl wrote:
>> 
>> The article does it the bad way. IMHO filp_open() and
>> vfs_read/vfs_write() are much less problematic wrt. to userspace.
>> FWIW see
>> ftp://ftp-1.gwdg.de/pub/linux/misc/suser-jengelh/kernel/quad_dsp-1.5.1.tar.bz2
>
> There is no good way.  You simply should NOT do it.

I never said there is a good way, just that some are better than others ;-)
As for quad_dsp, well, the reason why it's done in kernel-space is because
userspace wrapping with LD_PRELOAD does not always work, esp. with statically
compiled apps.


	-`J'
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