Re: [uml-user] UML <-> host communication

[Balaco B. <bal...@im...>]

Interesting idea! :)

But why not using "real" network connections? If you keep a connection
open, you will have no "big" overhead besides openning it the first time
(or reopenning, if eventually needed). You will be able to choose the
format of each message contents, as desired. And the communication can
be redirected to whatever you need, both in the UML or the host system.

You wrote about low latency, but gave no estimatives you expect. What
would be it? And what have you discarded using with this constraint?

-- 
  Balaco



On Mon, Oct 12, 2015, at 11:46, Ricardo Nunes wrote:
> Hi. I'm trying to create a 2 way communication channel between a kernel
> driver in UML with a process at the host.
> 
> What's the best way to do it? I started by trying to create a pipe ath
> the
> host, share in hostfs but I can't get any communication (write on pipe in
> UML, nothing appears in host).
> 
> Plus, I'm using os_open_file kind of functions (shared/os.h) but it
> always
> return me error -2 (bad file path). I thought that it could be because
> the
> kernel module was loaded before the hostfs is mounted but the same error
> happens if I insmod it after boot.
> 
> What are the alternatives here? I wanted a low latency type of
> communication, minimum overhead since it will be a lot of communications
> os
> 5-10 bytes each time.
> 
> Thanks
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