Date: Fri, 10 Sep 2021 22:40:23 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Mark Johnston <markj@freebsd.org> Cc: "net@FreeBSD.org" <net@freebsd.org>, hackers@freebsd.org Subject: Re: recvmsg() "short receive" after FIONREAD Message-ID: <4a2165c5-b97b-8fb7-9ada-0acae3197824@FreeBSD.org> In-Reply-To: <cdd2328e-e6aa-f0fc-a77a-adae03759f18@FreeBSD.org> References: <500a2272-c1b3-3f97-0096-9fe8117c4b95@FreeBSD.org> <6f455869-cbdd-ee20-f2f8-f633e22071e9@FreeBSD.org> <YTuznrhho4qGXqu8@nuc> <cdd2328e-e6aa-f0fc-a77a-adae03759f18@FreeBSD.org>
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On 10/09/2021 22:38, Andriy Gapon wrote: > On 10/09/2021 22:35, Mark Johnston wrote: >> Indeed, I suspect that this is the problem. Note that for >> kevent(EVFILT_READ) we subtract the number of control message bytes from >> the returned value, see filt_soread(). I wonder if FIONREAD should do >> the same thing. > > Thank you for the suggestion. > I think that it is a reasonable expectation that FIONREAD returns a number of > bytes that can be actually read. > I'll look at filt_soread(). kn_data = sbavail(&so->so_rcv) - so->so_rcv.sb_ctl; Is this it? Looks simple enough for a quick test :) -- Andriy Gapon
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