On Fri, 4 Sep 2009, Bruce Simpson wrote:

George V. Neville-Neil wrote:
Author: gnn
Date: Thu Sep  3 21:10:57 2009
New Revision: 196797
URL: http://svn.freebsd.org/changeset/base/196797

Log:
  Add ARP statistics to the kernel and netstat.

Thanks very much for this change. Any chance this struct can get explicitly versioned (i.e. as for struct igmpstat) as it is a new struct?

For sysctls, explicit versioning doesn't help too much -- what I've been pondering for another structure was including spares and having a capabilities field in the structure where flags are set when fields are known by the kernel. That way userspace can tell if the kernel knows about the field it cares about and therefore whether they're worth looking at.

Robert N M Watson
Computer Laboratory
University of Cambridge
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