From: Florian Westphal <fw@strlen.de>
To: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
Cc: "Arnaldo Carvalho de Melo" <acme@infradead.org>,
lkml <linux-kernel@vger.kernel.org>,
"linux-man@vger.kernel.org" <linux-man@vger.kernel.org>,
netdev <netdev@vger.kernel.org>,
"Ondřej Bílka" <neleai@seznam.cz>,
"Caitlin Bestler" <caitlin.bestler@gmail.com>,
"Neil Horman" <nhorman@tuxdriver.com>,
"Elie De Brauwer" <eliedebrauwer@gmail.com>,
"David Miller" <davem@davemloft.net>,
"Steven Whitehouse" <steve@chygwyn.com>,
"Rémi Denis-Courmont" <remi.denis-courmont@nokia.com>,
"Paul Moore" <paul@paul-moore.com>,
"Chris Friesen" <chris.friesen@windriver.com>
Subject: Re: recvmmsg() timeout behavior strangeness [RESEND]
Date: Sat, 3 May 2014 13:29:05 +0200 [thread overview]
Message-ID: <20140503112905.GC3514@breakpoint.cc> (raw)
In-Reply-To: <CAKgNAkhaFoMMzo1JB7wfgZ2Qwkgjvf8Tp8c77ih99=1qcDoNKg@mail.gmail.com>
Michael Kerrisk (man-pages) <mtk.manpages@gmail.com> wrote:
> Reinvestigating the problem, I see that I got my description of the
> behavior slightly wrong, although the fundamental problem remains.
> Here's my improved formulation:
[..]
> Since the timeout is only checked after the arrival of each datagram,
> we can have scenarios like the following:
>
> 0. Assume a timeout of 10 (T) seconds, that vlen is 5, and the call
> is made at time X
>
> 1. First datagram arrives at time X+2.
>
> 2. Second datagram arrives at time X+4 secs
>
> 3. Third datagram arrives at time X+6 secs
>
> 4. No more datagrams arrive.
>
> In this case, the call blocks forever. It hardly seems that this could
> be intended behavior. The problem, of course is that the timeout is
> checked only after receipt of a datagram.
Isn't that what MSG_WAITFORONE is supposed to solve?
next prev parent reply other threads:[~2014-05-03 11:29 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-30 13:59 recvmmsg() timeout behavior strangeness [RESEND] Michael Kerrisk (man-pages)
2014-04-30 13:59 ` Michael Kerrisk (man-pages)
[not found] ` <536101C9.9090601-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-05-03 10:28 ` Michael Kerrisk (man-pages)
2014-05-03 10:28 ` Michael Kerrisk (man-pages)
2014-05-03 11:29 ` Florian Westphal [this message]
2014-05-03 11:39 ` Michael Kerrisk (man-pages)
2014-05-12 10:15 ` Michael Kerrisk (man-pages)
2014-05-12 14:34 ` Arnaldo Carvalho de Melo
[not found] ` <20140512143451.GB13801-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2014-05-21 21:05 ` [PATCH/RFC] " Arnaldo Carvalho de Melo
2014-05-21 21:05 ` Arnaldo Carvalho de Melo
[not found] ` <20140521210535.GA5414-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2014-05-22 14:27 ` Michael Kerrisk (man-pages)
2014-05-22 14:27 ` Michael Kerrisk (man-pages)
2014-05-24 6:13 ` Michael Kerrisk (man-pages)
2014-05-26 13:46 ` Arnaldo Carvalho de Melo
[not found] ` <20140526134647.GB8176-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2014-05-26 21:17 ` Arnaldo Carvalho de Melo
2014-05-26 21:17 ` Arnaldo Carvalho de Melo
2014-05-27 16:35 ` Michael Kerrisk (man-pages)
[not found] ` <5384BEC5.2080607-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-05-27 19:21 ` Arnaldo Carvalho de Melo
2014-05-27 19:21 ` Arnaldo Carvalho de Melo
[not found] ` <20140527192115.GD25474-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2014-05-27 19:22 ` Arnaldo Carvalho de Melo
2014-05-27 19:22 ` Arnaldo Carvalho de Melo
2014-05-27 19:28 ` Michael Kerrisk (man-pages)
2014-05-27 19:28 ` Michael Kerrisk (man-pages)
[not found] ` <CAKgNAkht1vubHueYPpkRu_W5B8OYW3rPUkHeLEq5WMVbCvO47w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-05-27 20:30 ` Arnaldo Carvalho de Melo
2014-05-27 20:30 ` Arnaldo Carvalho de Melo
2014-05-28 5:00 ` Michael Kerrisk (man-pages)
[not found] ` <20140527203010.GA2764-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2014-05-28 12:20 ` Michael Kerrisk (man-pages)
2014-05-28 12:20 ` Michael Kerrisk (man-pages)
2014-05-28 15:07 ` Arnaldo Carvalho de Melo
[not found] ` <20140528150720.GB2764-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2014-05-28 15:17 ` David Laight
2014-05-28 15:17 ` David Laight
2014-05-28 19:50 ` 'Arnaldo Carvalho de Melo'
[not found] ` <20140528195004.GD2764-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2014-05-28 21:33 ` Chris Friesen
2014-05-28 21:33 ` Chris Friesen
2014-05-28 21:49 ` 'Arnaldo Carvalho de Melo'
2014-05-29 10:53 ` David Laight
2014-05-29 13:55 ` 'Arnaldo Carvalho de Melo'
2014-05-29 14:06 ` David Laight
2014-05-29 14:17 ` 'Arnaldo Carvalho de Melo'
[not found] ` <20140529141705.GI2764-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2014-05-29 14:40 ` David Laight
2014-05-29 14:40 ` David Laight
2014-05-29 15:33 ` [PATCH/RFC] Handle EFAULT in partial recvmmsg was " 'Arnaldo Carvalho de Melo'
2014-06-16 9:58 ` Michael Kerrisk (man-pages)
[not found] ` <CAKgNAkj-MVfeqEeffWKMNok0yO-Rm1kyY+zhXEy-U9NkB+aLow-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-06-24 20:25 ` Arnaldo Carvalho de Melo
2014-06-24 20:25 ` Arnaldo Carvalho de Melo
[not found] ` <20140624202541.GD3456-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2014-06-27 11:29 ` Michael Kerrisk (man-pages)
2014-06-27 11:29 ` Michael Kerrisk (man-pages)
2014-05-29 14:07 ` Michael Kerrisk (man-pages)
[not found] ` <5385D47A.3070401-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2014-06-27 11:37 ` Michael Kerrisk (man-pages)
2014-06-27 11:37 ` Michael Kerrisk (man-pages)
2014-05-23 19:00 ` David Miller
2014-05-23 19:00 ` David Miller
[not found] ` <20140523.150055.2214666905697701415.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2014-05-23 19:55 ` Arnaldo Carvalho de Melo
2014-05-23 19:55 ` Arnaldo Carvalho de Melo
[not found] ` <20140523195522.GH2741-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2014-05-24 6:13 ` Michael Kerrisk (man-pages)
2014-05-24 6:13 ` Michael Kerrisk (man-pages)
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