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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <38b2ab8a0805150040s6933de14p7c2014945ba0810d@mail.gmail.com>
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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/