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

From: Fabien Chouteau
Subject: Re: [Qemu-devel] [PATCH] Use clean shutdown request for ctrl-a x
Date: Wed, 04 Jul 2012 12:27:48 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:13.0) Gecko/20120615 Thunderbird/13.0.1

On 07/04/2012 12:07 PM, Kevin Wolf wrote:
> 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.

This function will change the behavior of ctrl-a x by printing "qemu:
terminating on signal 0".

Fabien Chouteau

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