[libvirt] compile fail on FreeBSD

[Daniel P. Berrange]

On Fri, Nov 11, 2011 at 05:31:14PM -0700, Eric Blake wrote:
> This failure on FreeBSD 8.2 popped up this week, and I suspect Dan's
> virnetdev refactoring, but haven't had time to further investigate and
> fix it:
> 
> util/virnetdev.c: In function 'virNetDevExists':
> util/virnetdev.c:93: error: storage size of 'ifr' isn't known
> util/virnetdev.c:95: warning: implicit declaration of function
> 'virNetDevSetupControl'
> 
> and so on.  Probably some conditional compilation going wrong when on a
> non-Linux machine.

This code is protected by a

#ifdef HAVE_NET_IF_H


So if BSD's net/if.h does not provide any 'struct ifreq' then we need to
fix things.

Does anyone know if the 'struct ifreq'  / SIOCGIFHWADDR / SIOCGIFMTU / etc
ioctl() stuff is entirely Linux specific, or is it semi portable to other
UNIX ?  


Daniel
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