Messages in this thread |  | | | Date | Thu, 15 May 2008 09:40:47 +0200 | | From | "Francis Moreau" <> | | 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@analogic.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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