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Re: kern/54435: reading TCP urgent data with MSG_OOB doesn't clear poll(2) status
The following reply was made to PR kern/54435; it has been noted by GNATS.
From: mlelstv%serpens.de@localhost (Michael van Elst)
Subject: Re: kern/54435: reading TCP urgent data with MSG_OOB doesn't clear poll(2) status
Date: Mon, 5 Aug 2019 04:09:15 -0000 (UTC)
uwe%stderr.spb.ru@localhost (Valery Ushakov) writes:
> But this is cheating :) You continue reading from the socket which
> does succeed and which clears POLLPRI. The bug I'm reporting is
> exactly that if you poll the socket in this state you will get POLLPRI
> even though there is no urgent/oob data.
And I tell you that this is expected behaviour. It's not a second stream
that you can just read independently (poll/select, then read) and a
program that acts normally on POLLIN wouldn't even see that.
Michael van Elst
"A potential Snark may lurk in every tree."
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