On Tue, Nov 25, 2014 at 7:18 PM, Ryota Ozaki <ozak...@netbsd.org> wrote: > Hmm, if_flags. > > http://mail-index.netbsd.org/tech-net/2009/01/27/msg000985.html > > Do we have to care about kvm(3) users (i.e., netstat) as well as > the callout_t issue?
For new flags, you can reuse if__pad1. > I don't understand how kvm(3) works though, if we don't change existing > members of struct ifnet, can old netstat(1) run on a new kernel that > adds a value hidden in _KERNEL to struct ifnet? I think adding a new member at the tail doesn't change member offsets, so netstat(1) *should* keep working. But for future, netstat(3) should use kvm(3), so that it keeps working even after struct ifnet changes.
