> The real incompatible change is in -current but not 4, and -current has
> binary compat with the old ioctl of smaller size.  Binary compatibility
> with the old version of SIOCGIFCONF in currrent, with the larger size
> and the bizarre size-dependent behavior doesn't make sense, and would
> cause the other half of the programs to fail (well, right now we have
> dhcp vs racoon and I don't know about others).
 
If this is the case, shouldn't the SIOCGIFCONF ioctl number be bumped?