[vbox-dev] Using Sockets in Device emulation

Klaus Espenlaub klaus.espenlaub at oracle.com
Mon Sep 19 10:34:04 PDT 2011

On 16.09.2011 22:20, Arpit Patel wrote:
> Hi,
> I wanted to use tcp sockets from Device Emulation (eg. DevAHCI.cpp) and
> connect to a socket server running on one of the Guest OS or to another
> system on the network. I have following questions -

DevAHCI is a rather complex device... which means it's not the ideal 
starting point.

What do you actually want to achieve? Accessing remote storage? It would 
help a lot of you'd say a few words about your general idea before 
setting out to implement it.

> 1. Would this kind of socket comm possible from Device Emulation code?
> 2. As device emulation code runs in Ring0 mode, if I try to even include
> iprt/sockets.h file, it complains that RTSocket APIs are not available
> in Ring-0 context. If that is so, what sockets can I use from within
> Device Emulation code?
> 3. How do I know which code of Virtualbox is running in Ring0 and which
> is running in Ring3? I was under the impression that the vbox host
> drivers that are built and installed on the host OS is the only code
> that runs in Ring0 and everything else should be Ring3.
> 4. Is there any sample code of this socket comm that can be used from
> device emulation in virtualbox, that you can point me to?.

In general you need to make sure that the socket code is ONLY used by 
Ring3 code, then it would compile. However this all may be unnecessary 
if you actually want a new storage "format".


> Thanks.
> Arpit.
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> vbox-dev at virtualbox.org
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