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Re: [Qemu-stable] [Qemu-devel] qmp commands get rejected


From: Luiz Capitulino
Subject: Re: [Qemu-stable] [Qemu-devel] qmp commands get rejected
Date: Fri, 24 May 2013 11:21:52 -0400

On Fri, 24 May 2013 16:36:26 +0200
Stefan Priebe - Profihost AG <address@hidden> wrote:

> Am 24.05.2013 um 16:02 schrieb Luiz Capitulino <address@hidden>:
> 
> > On Fri, 24 May 2013 15:57:59 +0200
> > Stefan Priebe - Profihost AG <address@hidden> wrote:
> > 
> >> Am 24.05.2013 um 15:23 schrieb Luiz Capitulino <address@hidden>:
> >> 
> >>> On Fri, 24 May 2013 07:50:33 +0200
> >>> Stefan Priebe <address@hidden> wrote:
> >>> 
> >>>> Hello list,
> >>>> 
> >>>> since upgrading from qemu 1.4.1 to 1.5.0 i've problems with qmp commands.
> >>>> 
> >>>> With Qemu 1.5 i've the following socket communication:
> >>>> 
> >>>> '{"execute":"qmp_capabilities","id":"12125:1","arguments":{}}'
> >>>> 
> >>>> '{"return": {}, "id": "12125:1"}'
> >>>> 
> >>>> '{"execute":"qom-set","id":"12125:2","arguments":{"value":2,"path":"machine/peripheral/balloon0","property":"guest-stats-polling-interval"}}'
> >>>> 
> >>>> '{"QMP": {"version": {"qemu": {"micro": 0, "minor": 5, "major": 1}, 
> >>>> "package": ""}, "capabilities": []}}'
> >>>> 
> >>>> '{"id": "12125:2", "error": {"class": "CommandNotFound", "desc": "The 
> >>>> command qom-set has not been found"}}'
> >>>> 
> >>>> 
> >>>> It seems that the command mode (qmp_capabilities) gets resets by the 
> >>>> welcome banner?
> >>> 
> >>> It looks like you got disconnected before qom-set was issued.
> >> 
> >> No its the same socket connection. No disconnect had happened.
> >> 
> >>> 
> >>> Can you share more details on how those commands are being issued?
> >> 
> >> They're send through socket with a perl script. What do you need?
> > 
> > That perl script maybe? I can't reproduce the problem.
> 
> I would try to create a small example script.

I use qmp-shell and other little scripts very often.

> Am this be due to the fact that I don't wait for the welcome banner right now?

If you're not reading from the socket, then you'll get the banner back when
you read your first response. But qom-set shouldn't fail because of that.



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