[Libvir] Proposal: Block device and network stats

[Richard W.M. Jones]

Daniel P. Berrange wrote:
> It is probably worthwhile though to
> ensure that we design the APIs so that the structs are always allocated by
> the internal driver and not the caller. This allows us to add more fields
> at a later date if needed.

Instead of the above, the caller has to pass in the size of the struct.

Pros to passing in the struct & size:

* New caller / old libvirt can be detected, rather than causing a segfault.
* Caller is less likely to forget to free the struct (because it is 
mostly likely on their stack, or they explicitly malloc'd it).

But yes, unsafe C linkage & lack of garbage collection sucks ...

Rich.

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