Re: [uml-user] Some Drivers in UML kernel

[David F. R. P. <dav...@gm...>]

Hi

I was able to compile my driver using user space library libc.a. But when I
run the Linux executable, it runs this driver very early in the bootup
process such that I have not setup the ethernet eth0 interface.
So the output looks like:
HelloTCP Start
Not able to connect to remote client...

Then...I see the config on the eth0.

So I wanted to compile the driver as a loadable module but now I have
problems compiling due to errors of the users space socket system calls like
"socket", "connect", "setsockopt", as undefined. How could I do it?

David

On Fri, May 16, 2008 at 2:02 PM, Jeff Dike <jd...@ad...> wrote:

> On Fri, May 16, 2008 at 11:35:20AM -0700, David Francisco Rodriguez Perez
> wrote:
> > I am working on a simulator of a product and so far we have decided to go
> > with UML. I have so far 2 questions.
> > 1. There is a network namespace patch that is coming into the mainline in
> > 2.6.26. Is this patch going to be supported in UML?
>
> If it's in mainline, it's in UML (for the most part - some things
> require arch support, but I don't the the namespace stuff is among them).
>
> > 2. The following question is maybe a no-brainer. We have a a user space
> > program using the socket library to connect to a server outside the UML
> > entity. We would like to change that to a kernel driver in UML. Can we
> > create a module for UML that uses a user space library like the socket
> > library? I would assume not, but just to confirm.
>
> You can.  That's how UML drivers generally work.  See pcap and vde for
> a couple of drivers that pull in libraries.
>
>                    Jeff
>
> --
> Work email - jdike at linux dot intel dot com
>