From owner-freebsd-bugs  Fri Aug 16  1:20:11 2002
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Date: Fri, 16 Aug 2002 01:20:05 -0700 (PDT)
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Cc: 
From: Bruce Evans <bde@zeta.org.au>
Subject: Re: kern/36219: poll() behaves erratic on BPF file descriptors.
Reply-To: Bruce Evans <bde@zeta.org.au>
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The following reply was made to PR kern/36219; it has been noted by GNATS.

From: Bruce Evans <bde@zeta.org.au>
To: Lev Walkin <vlm@netli.com>
Cc: Nate Lawson <nate@root.org>, <freebsd-gnats-submit@FreeBSD.org>,
	<gad@FreeBSD.org>, <bde@FreeBSD.org>
Subject: Re: kern/36219: poll() behaves erratic on BPF file descriptors.
Date: Fri, 16 Aug 2002 18:17:53 +1000 (EST)

 On Thu, 15 Aug 2002, Lev Walkin wrote:
 
 > Nate Lawson wrote:
 > > I looked over the current state of bpf.c and it seems like this PR can be
 > > closed.  Comments?
 > >
 > > if (events & (POLLIN | POLLRDNORM)) {
 > >     /*
 > >      * An imitation of the FIONREAD ioctl code.
 > >      * XXX not quite.  An exact imitation:
 > >      *if (d->b_slen != 0 ||
 > >      *    (d->bd_hbuf != NULL && d->bd_hlen != 0)
 > >      */
 > >     if (d->bd_hlen != 0 ||
 > >         ((d->bd_immediate || d->bd_state == BPF_TIMED_OUT) &&
 > >         d->bd_slen != 0))
 >
 > Don't we want a POLLIN event to occur when the BPF_TIMED_OUT
 > state is reached and there is still no data?
 > This seems to be a timeout on waiting data, which should
 > be reported up.
 
 Something like that.  I think your reply in the middle of the followup
 mail gives more details.  I hoped that jdp would finish fixing this
 (It has something to do with a change that he made.  I don't completely
 understand it).
 
 One point in the original PR seems to have been OBE (E = MFC).
 
 Bruce
 

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