Re: [Xen-devel] Re: [PATCH] libxl, Introduce a QMP client

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Tue, 7 Jun 2011, Anthony PERARD wrote:
> On Tue, Jun 7, 2011 at 15:30, Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx> wrote:
> >> Actually, QEMU doesn't seem to handle more than one client at a time
> >> with a single socket.
> >
> > That seems like a pretty obvious short coming, do you know if it is a
> > deliberate policy or just a case of not implemented yet?
> 
> I think it because they use the same "char device" code to handle by
> example the serial port or the monitor (including QMP). So when a
> client is connected, there just stop to handle the listenning fd until
> the client disconnects itself.
> 
> >> ÂFor more client, we can always open more than
> >> one QMP server with different path/port. In this case, they will be
> >> handle separately by QEMU.
> >
> > Problem is determining the correct number to create when we start qemu.
> 
> Well, a simple answer would be two, one to listen the event from QEMU,
> if we need to do that, and the second one would be for the commands,
> one at a time, and libxl close the socket. If a command socket is
> already in use, then another libxl client whose trying to connect to
> the same socket will wait until QEMU accept the connection.

Yeah, we could start by implementing only the "libxl commands" socket,
leaving out the event socket for later.

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