Date: Wed, 15 May 2013 13:29:59 +0100 From: Paul "LeoNerd" Evans <leonerd@leonerd.org.uk> To: Julian Elischer <julian@freebsd.org> Cc: freebsd-hackers@freebsd.org, Adrian Chadd <adrian@freebsd.org>, Eugen-Andrei Gavriloaie <shiretu@gmail.com> Subject: Re: Managing userland data pointers in kqueue/kevent Message-ID: <20130515132959.7f113255@shy.leonerd.org.uk> In-Reply-To: <519327DF.6060002@freebsd.org> References: <CCE4FFC4-F846-4F81-85EE-776B753C63C6@gmail.com> <20130513185357.1c552be5@shy.leonerd.org.uk> <CAJ-VmomQmPjtUhUo2%2BK=0Ychw-=qgawrZt3hnYeCPNNhA9T50A@mail.gmail.com> <CAJ-VmonKC_7J=aNgRntub9DN%2BEfQxrhMjstXHSJ634%2BaFemcLg@mail.gmail.com> <20130513191513.786f4f02@shy.leonerd.org.uk> <8A02C28F-89CB-4AE3-A91A-89565F041FDE@gmail.com> <CAJ-VmonjOS7Axq18VxL6B53T4DVgAYdY3LaT8nd7afFj2dq3cA@mail.gmail.com> <20130513194411.5a2dfa2e@shy.leonerd.org.uk> <519327DF.6060002@freebsd.org>
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On Wed, 15 May 2013 02:14:55 -0400
Julian Elischer <julian@freebsd.org> wrote:
> I would suggest that one answer would be to create an extension to=20
> register a
> kevent to catch these events..
>=20
> (the knote_drop())
>=20
> The returned event could have all the appropriate information for the
> event being dropped..
Is that not the exact thing I suggested?
The "extension to create register a kevent to catch these events" is
that you put the EV_DROPWATCH bit flag in the event at the time you
register it.
The "returned event [that] could have all the appropriate informaiton
for the event being dropped" is that you receive an event with
EV_DROPPED set on it. It being a real event includes of course the
udata pointer, so you can handle it.
It's really simple to use:
When you register,
ev->flags |=3D EV_DROPWATCH
When you receive an event, process it in the normal way, then
if(ev->flags & EV_DROPPED)
free(ev->udata);
and that is all there is to it.
--=20
Paul "LeoNerd" Evans
leonerd@leonerd.org.uk
ICQ# 4135350 | Registered Linux# 179460
http://www.leonerd.org.uk/
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