Message-Id: <200502071652.j17GqmJA010393@turing-police.cc.vt.edu>
To: Arjan van de Ven <arjan@infradead.org>
Cc: linux lover <linux_lover2004@yahoo.com>, linux-kernel@vger.kernel.org
Subject: Re: How to read file in kernel module? 
In-Reply-To: Your message of "Mon, 07 Feb 2005 07:38:36 +0100."
             <1107758316.3886.58.camel@laptopd505.fenrus.org> 
From: Valdis.Kletnieks@vt.edu
References: <20050207061718.47940.qmail@web52203.mail.yahoo.com>
            <1107758316.3886.58.camel@laptopd505.fenrus.org>
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On Mon, 07 Feb 2005 07:38:36 +0100, Arjan van de Ven said:
> On Sun, 2005-02-06 at 22:17 -0800, linux lover wrote:

> > Now what i want is to use same bufproc_read &
> > bufproc_write  functions defined in /proc file
> > handling kernel module to be used in another kernel
> > module to read that /proc/file in kernel module.The
> > second kernel module only used to read /proc file in
> > kernel. I am not understanding how can i open that
> > /proc/file in second kenrel module to read in kernel?
> > regards,
> 
> the answer really is that you should not read files from kernel
> modules; /proc or otherwise.

As Arjan said - what you probably want to be doing instead is changing
the code in your first module that provides the bufproc_* functions so
that they're wrappers around some code that does the "real work", and
then call the real_work function from your second module.  Most likely,
what you *really* want to be passing around is some 'struct *foo', and
the bufproc_* functions are converting to/from a struct foo and a linear
byte stream.  (In the limiting case where it's just one variable, why not
just 'EXPORT_SYMBOL(variable)' in the first module and then just assign or
read the variable from the second module?)


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