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Re: [Qemu-devel] Multiple QMP socket clients


From: Daniel P. Berrange
Subject: Re: [Qemu-devel] Multiple QMP socket clients
Date: Tue, 11 Oct 2016 14:11:07 +0100
User-agent: Mutt/1.7.0 (2016-08-17)

On Tue, Oct 11, 2016 at 12:26:37PM +0200, Samuel Ortiz wrote:
> Hi,
> 
> On a qemu instance started with a qmp unix socket:
> 
> -qmp unix:/tmp/ctrl.sock,server,nowait
> 
> I am trying to have multiple clients working on that socket but
> although the qmp server seems to accept the connections, only the first
> connected client gets his request processed. The next client requests
> will just hang until the first one exits.
> 
> Is that an intended behaviour ?

Yes, the character device code is designed around the idea of a single
endpoint.

In the case of the monitor you could work around it by adding multiple
-qmp arguemnts, each with different socket. Of course you have to make
sure each client doesn't trample on the other client when doing this.


Regards,
Daniel
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