Subject: Re: Implementing interface media type autodetection?
To: None <tech-net@NetBSD.ORG>
From: der Mouse <mouse@Collatz.McRCIM.McGill.EDU>
Date: 06/09/1996 13:36:10
> [...] the link* flags as they are. If they are used as a binary
> state indicator, we've got 8 possible states to play with, which will
> be more than enough for most interfaces, but will never be enough for
> all. Adding a "link3" would probably [...]
Unfortunately adding another IFF_ flag bit requires an interface
change. Fortunately it's a relatively small interface change.
The problem is that in the struct ifreq and struct if and related
places, the flags field is a short. And all 16 of its bits are in use.
I've promoted that field to an int (I wanted another flag bit for a
completely different reason), and haven't seen any trouble short of, of
course, needing to recompile everything. (And having a bit of a flag
day, since before-and-after kernels and userlands are compatible in