How to get data from kernel module ?

[Lukáš Czerner]

On Thu, 6 May 2010, Julian Elischer wrote:

> Date: Thu, 06 May 2010 09:41:32 -0700
> From: Julian Elischer <julian at elischer.org>
> To: Lukáš Czerner <czerner.lukas at gmail.com>
> Cc: freebsd-hackers at freebsd.org
> Subject: Re: How to get data from kernel module ?
> 
> On 5/6/10 6:38 AM, Lukáš Czerner wrote:
> > Hi,
> > 
> > I am creating a kernel module and I need to get some information from
> > that module. I can do this with ioctl and pass the data to the
> > user space but it seems a bit unpractical to me, because I do not know
> > the amount of the data - it can differ. I do not know of any way to
> > pass a list of structures to the userspace through ioctl - is there
> > any?
> > 
> > So my question is, is there any standard way in FreeBSD to do this ?
> > In linux I would probably use the sysfs, but in FreeBSD I can not find
> > anything similar, except just creating some virtual filesystem on my
> > own and obviously this is not what I want to do.
> > 
> 
> you can add a sysctl to pass out arbitrary information very easily.
> It's up to you to decide where you want to put it in the sysctl
> tree.
> 

Thank to you all for suggestions. I will look at the sysctl then.

Thanks!

-Lukas