On 02/08/2011 08:02 PM, Osier Yang wrote:
> 于 2011年02月09日 01:12, Eric Blake 写道:
>> On 02/08/2011 03:30 AM, Osier Yang wrote:
>>> +bool
>>> +virIsDevMapperDevice(const char *devname)
>>> +{
>>> + struct stat buf;
>>> +
>>> + if (devname&&
>>> + !stat(devname,&buf)&&
>>
>> One other thing - the check for devname being non-NULL is not
>> necessary...
>>
>>> +bool virIsDevMapperDevice(const char *devname);
>>
>> if you add ATTRIBUTE_NONNULL(1) to this declaration. Given that the
>> only use of this new function to date doesn't pass a NULL pointer, we
>> might as well make that part of the API.
>>
> Yeah, it's more reasonable to add ATTRIBUTE_NONNULL to this internal
> function, but do we need to make change on the API? I'm not sure
> if it will introduce some problem.Adding ATTRIBUTE_NONNULL _is_ the API change I was referring to - it simplifies the implementation, and puts a contract on the caller to not pass NULL. We can always remove it later (and re-instate the explicit null check in the implementation) if we find a reason to, since the function is internal. -- Eric Blake [email protected] +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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