kqueue oddity

[Dan Nelson]

In the last episode (Apr 01), Vclav Haisman said:
> Dan Nelson wrote:
> > It's a kqueue bug, but a minor one.  The problem is that the same
> > "flags" field is used to pass "actions" from the client, and return
> > status from the kernel.  When you call kqueue with EV_ADD, the
> > kernel never clears the flags when creating the internal object, so
> > it's always visible when events fire.  This can get annoying when
> > trussing kqueue-using programs because very single event has the
> > EV_ADD flag :) Apply the following diff to have the kernel strip
> > EV_ADD:
>
> Thanks. Why isn't this fix applied? From the patch's time stamp it
> seems like it is known for quite some time now.

Mainly because it's a cosmetic thing; most of the time you're not
printing the raw kevent values.  I never submitted a PR because it only
gets annoying if my truss PR (
http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/52190 ) is committed, so
it's waiting for that.  EV_DISABLE needs the same treatment; my full
kevent debugging patch is at
http://www.allantgroup.com/FreeBSD/kevent.diff .

-- 
	Dan Nelson
	dnelson at allantgroup.com