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From: Chris Friesen <chris.friesen-b7o/lNNmKxtBDgjK7y7TUQ@public.gmane.org>
To: Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: "Arnaldo Carvalho de Melo"
	<acme-f8uhVLnGfZaxAyOMLChx1axOck334EZe@public.gmane.org>,
	"Caitlin Bestler"
	<caitlin.bestler-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	"David Miller" <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
	netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	"Chris Van Hoof"
	<vanhoof-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	"Clark Williams"
	<williams-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	"Neil Horman" <nhorman-2XuSBdqkA4R54TAoqtyWWQ@public.gmane.org>,
	"Arnaldo Carvalho de Melo"
	<acme-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	"Andrew Grover"
	<andy.grover-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	"Elie De Brauwer"
	<eliedebrauwer-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	"Steven Whitehouse"
	<steve-TMeXKDtMCpxBDgjK7y7TUQ@public.gmane.org>,
	"Rémi Denis-Courmont"
	<remi.denis-courmont-xNZwKgViW5gAvxtiuMwx3w@public.gmane.org>
Subject: Re: recvmmsg() timeout behavior strangeness
Date: Wed, 09 Jan 2013 16:33:02 -0600	[thread overview]
Message-ID: <50EDF01E.10709@genband.com> (raw)
In-Reply-To: <CAHO5Pa2goUtiBU8ye2beTBExL4it2-aDCPBhDOGyO3NX_PV_pQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

On 12/23/2012 02:50 PM, Michael Kerrisk wrote:

> If I understand correctly, the *intended* purpose of the timeout
> argument is to set a limit on how long to wait for additional
> datagrams after the arrival of an initial datagram. However, the
> syscall behaves in quite a different way. Instead, it potentially
> blocks forever, regardless of the timeout.

Looking at the code, I think you're correct.

The comments for a2e2725 say the timeout works like for ppoll(), where 
it is "an upper limit on the time for which poll() will block, in 
milliseconds."

I wonder if we could play some games with sk->sk_rcvtimeo to accomplish 
this?

Chris
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  parent reply	other threads:[~2013-01-09 22:33 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-12-23 20:50 recvmmsg() timeout behavior strangeness Michael Kerrisk
     [not found] ` <CAHO5Pa2goUtiBU8ye2beTBExL4it2-aDCPBhDOGyO3NX_PV_pQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-01-09 22:33   ` Chris Friesen [this message]
     [not found]     ` <50EDF01E.10709-b7o/lNNmKxtBDgjK7y7TUQ@public.gmane.org>
2013-01-10 10:04       ` Steven Whitehouse
2013-01-10 15:24         ` Chris Friesen

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