linux-kernel - Re: How to avoid data copies in a driver ?

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Date:	Thu, 15 May 2008 09:40:47 +0200
From:	"Francis Moreau" <francis.moro@...il.com>
To:	"linux-os (Dick Johnson)" <linux-os@...logic.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: How to avoid data copies in a driver ?

Hello,

On Wed, May 14, 2008 at 11:23 PM, linux-os (Dick Johnson)
<linux-os@...logic.com> wrote:
> You memory-map the data. Impliment mmap() in your driver.
> You can also impliment poll()  { select() } so your
> application knows when new data are available.
>
> You cannot use a user-mode file-descriptor in the kernel.
>

Why not ?

I'm suprised because what I need doens't seem so uncommon, usually
devices send or
receive data to/from files. So a helper (system call ?) to achieve
that other than the basic
read/write seems needed, no ?

-- 
Francis
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