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Re: [libvirt] [PATCH] Improve invalid argument checks for the public API



On 05/17/2011 12:56 PM, Eric Blake wrote:
> On 05/17/2011 12:12 PM, Matthias Bolte wrote:
>>
>> The actual semantic for (n)params is not completely defined, is it?
>> This just matches what (most of?) the driver currently do.
>>
>>> Hmm, here we document that nparams can be <= the value returned by
>>> virDomainGetSchedulerType; which means it can be 0, which means that
>>> params can be NULL.  I think we should change this to allow NULL,0 in
>>> input as a way of querying the proper nparams size on output.
>>
>> Why would you add a second way to query nparams?
> 
> I guess the alternative is to tighten up the documentation to
> specifically state that nparams must be the number of parameters (and
> not a subset) managed by the device for Get; Set can still do subsets
> though.

I went with the documentation alternative in this patch [1], although I
didn't add the explicit NULL checking to the new API functions (neither
in Hu's virDomainSetSchedulerParametersFlags pushed today, nor my
proposed virDomainGetSchedulerParametersFlags in [1]), so depending on
which one gets pushed first, the other patch should probably add some
NULL checking.

[1] https://www.redhat.com/archives/libvir-list/2011-May/msg01146.html

-- 
Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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