Re: [Qemu-devel] [PATCH 0/2] Tunnel character device data over VNC (v1)

[Anthony Liguori <anthony@codemonkey.ws>]

Daniel P. Berrange wrote:
> On Wed, Jul 01, 2009 at 01:36:23PM -0500, Anthony Liguori wrote:
>   
>> Daniel P. Berrange wrote:
>>     
>>> The following two patches make it possible to tunnel character devices
>>> over VNC, using a new VNC extension. This is motivated by the existing
>>> QEMU support for tunnelling audio streams over VNC, and the code follows
>>> a very similar design.  The key requirement here is that it should not
>>> be neccessary to specifically configure each character device to make
>>> it available via VNC. The admin should be able to configure the char
>>> devices with all current available backends (file, pty, null, tcp, udp,
>>> unix, etc), and regardless of this config be able to snoop on data from
>>> any active VNC client on demand.
>>>  
>>>       
>> Shouldn't it just be the character devices put on vc's?
>>     
>
> The 'vc' concept is a stateful one, requiring the user to switch betweeen
> channels statically and is opaque to VNC clients - all they see is a
> framebuffer with no idea that QEMU has this magic sequence to change
> what the framebuffer displays, nor what vc's are available.

I understand what you're suggesting, but I think the right way to handle 
this use-case is to allow character devices to be redirected after 
initial open making them truly dynamic.

This would be useful outside of VNC too.

Regards,

Anthony Liguori