Re: [Qemu-devel] function to execute qmp commands

[Programmingkid]

On Sep 1, 2015, at 2:19 AM, Markus Armbruster wrote:

> Programmingkid <address@hidden> writes:
> 
>> Is there a function that can execute a qmp command in QEMU?
> 
> Sure you want to do that, and not call the C interface instead?  Let me
> explain how QMP works:
> 
> * QMP core: receive JSON, parse, find handler function (defined in
>  qmp-commands.hx), call it
> 
> * The handler function is of type
> 
>      void (*)(QDict *params, QObject **ret_data, Error **errp);
> 
>  It's normally an function generated from QAPI schema that unmarshals
>  the arguments, calls the real function, and marshals result on success
>  or forwards the error on failure.
> 
>  The point of this marshalling business is to have a real function with
>  a nice C interface rather than this QDict / QObject stuff.
> 
> * QMP core: format and send reply.
> 
> Handler function example: query-command-line-options
> 
> qmp-commands.hx points to
> qmp_marshal_input_query_command_line_options(), which calls
> qmp_query_command_line_options().  The latter looks like this:
> 
>    CommandLineOptionInfoList *
>    qmp_query_command_line_options(bool has_option,
>                                   const char *option,
>                                   Error **errp)
> 
> That's the function you want to call from C.

Thank you very much for the help.