Re: [Qemu-devel] [PATCH 1/8] qapi: fix NULL pointer dereference

[Anthony Liguori]

On 12/16/2011 09:42 AM, Paolo Bonzini wrote:
> On 12/16/2011 04:23 PM, Anthony Liguori wrote:
> > Ok. I think nullable strings are not a good idea simply because it
> > means that a property can have a state that cannot be set.
>
> How is this different from NULL links? (Honest, not trick question :)).

An empty string == NULL for links.

If a pointer is NULL, an empty string is returned.  So get/set is full 
symmetric.

> > Long term, I want to be able to do something like dump the current
> > device graph to a config file, and then use that config file to recreate
> > the same machine again. A nullable property without a null
> > representation would not allow this.
>
> JSON null is such a representation.

For JSON, but it doesn't map to a config file easily nor does it map to command 
line syntax well.

Regards,

Anthony Liguori

> Paolo