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Re: [Qemu-devel] [PATCH] Use clean shutdown request for ctrl-a x

From: Kevin Wolf
Subject: Re: [Qemu-devel] [PATCH] Use clean shutdown request for ctrl-a x
Date: Wed, 04 Jul 2012 12:07:45 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120605 Thunderbird/13.0

Am 03.07.2012 17:07, schrieb Fabien Chouteau:
> On 07/03/2012 04:49 PM, Paolo Bonzini wrote:
>> Il 03/07/2012 16:00, Peter Maydell ha scritto:
>>> I was just talking on #qemu this morning about the equivalent question
>>> of whether the ARM semihosting exit function ought to be doing a
>>> qemu_system_shutdown_request rather than a plain exit()...
>>> The interesting question for the qemu-char case is whether the code that
>>> feeds this magic byte to us is expecting it to have immediate effect
>>> or is happy to continue execution and let us shut down with a slight
>>> delay.
>> And also whether it is supposed to obey -no-shutdown...
> I didn't know this option...
> My goal is to make ctrl-a x to close Qemu in a clean way.
> The current exit(0) skips a lot of cleanup/close functions, for
> example in block drivers.
> We can create a new shutdown function that will override the
> -no-shutdown option to keep a consistent behavior with ctrl-a x.
> void qemu_system_force_shutdown(void)
> {
>     no_shutdown = 0;
>     qemu_system_shutdown_request();
> }

The same thing already exists in qemu_system_killed(). It could use the
same new function if you added it. Or you could reuse the existing code
in the ctrl-a x handler by sending SIGTERM.


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