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Subject: Re: [Qemu-devel] [PATCH] support for unsetting the VNC password
	from the monitor.
From: Nolan <nolan@sigbus.net>
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Date: Thu, 05 Mar 2009 15:18:41 -0800
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To: qemu-devel@nongnu.org

Anthony wrote:
> Nolan wrote:
> > Add monitor support for setting the VNC password to "", disabling VNC.
> > 
> > The magic sentinel value is "<<unset>>" which is not a valid VNC
> > password by virtue of being 9 characters long.
> 
> That's a little too magical for me. If you want to disable VNC, can't
> you just say change vnc none?

If you start with "-vnc :0,password", you will have no password set
(thus logins are disabled), but qemu is listening on the port (keeping
it occupied).

"vnc change none" will close the socket.  The intent of "change vnc
password <<unset>>" is to leave the socket open, but disallow logins
until the password is reset.  Basically the goal is to provide a way to
get back into state we were in immediately after process start.  This is
currently possible with the interactive "change vnc password" command,
but not possible with the non-interactive variant.