linux-kernel - Re: Suggestion: LKM should be able to add system call for itself

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Date:	Mon, 7 Jul 2008 10:40:27 +0200
From:	"Bart Van Assche" <bart.vanassche@...il.com>
To:	"Jinkai Gao" <mickeygjk@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"Arjan van de Ven" <arjan@...radead.org>
Subject: Re: Suggestion: LKM should be able to add system call for itself

On Mon, Jul 7, 2008 at 7:09 AM, Jinkai Gao <mickeygjk@...il.com> wrote:
> LKM(loadable kernel module) was first introduced for drivers. Users
> rarely need to talk to the modules directly. If does, several methods
> are available now, such as /proc file, interruption, etc. However,
> these interfaces are predefined, which makes the communication between
> user space and kernel space quite restricted.

Did you already have a look at e.g. http://lwn.net/Kernel/LDD3/ for
suggestions of alternatives for communication between userspace and
kernel modules ? Alternatives to system calls are e.g. ioctl's, memory
mapped I/O and sockets. The last alternative is used by udevd
(PF_NETLINK).

Bart.
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