Hi,

I am not sure, if I am right on tech-net ...

suppose, I want to add an IOCTL to e.g. enable debuggin of interface
lo0. (e.g.   ioctl(s,DEBUGLO0,(struct ifreq *)), where the struct
ifreq * contians as name field "lo0".

What is there needed at what part of the kernel(-source) to add this new
DEBUGLO0 ioctl to allow if_loop.c in its loioctl() routine to use
this new one?

And no, I don't want to install some /dev/<if> devices and use these
for communication if not absolutely necessary (which shold not be in
my understanding).

Why are some of the get-ioctls in sys/sockio.h modelled as _IOR()
and others as _IOWR() (SIOCGETVIFCNT vs SIOCGPGRP)?

Thanks 
  Heiko

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