linux-kernel - Re: Why is the 'loff_t *offset' parameter in the file

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Message-ID: <4DB6BAFF.8080302@gmail.com>
Date:	Tue, 26 Apr 2011 14:30:55 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Amit Ben Shahar <amit.bens@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: Why is the 'loff_t *offset' parameter in the file_operations'
 read function a pointer?

On 04/26/2011 01:58 PM, Amit Ben Shahar wrote:
> (if i'm off topic or should look elsewhere i apologize - couldn't find
> information anywhere)
> I am coding a kernel module and implementing a file's operations, the
> read operation received an loff_t *offset parameter, why is this a
> pointer?

Because you are responsible for changing it appropriately.

> is it in userspace?

Nope, in kernelspace.

I think this is described in LDD3, isn't it?

regards,
-- 
js
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