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Date: Thu, 10 Jan 2013 09:24:47 -0600 From: Chris Friesen <chris.friesen@...band.com> To: Steven Whitehouse <steve@...gwyn.com> CC: Michael Kerrisk <mtk.manpages@...il.com>, Arnaldo Carvalho de Melo <acme@...stprotocols.net>, Caitlin Bestler <caitlin.bestler@...il.com>, David Miller <davem@...emloft.net>, netdev@...r.kernel.org, Chris Van Hoof <vanhoof@...hat.com>, Clark Williams <williams@...hat.com>, Neil Horman <nhorman@...driver.com>, Arnaldo Carvalho de Melo <acme@...hat.com>, Andrew Grover <andy.grover@...il.com>, Elie De Brauwer <eliedebrauwer@...il.com>, linux-man@...r.kernel.org, RĂ©mi Denis-Courmont <remi.denis-courmont@...ia.com> Subject: Re: recvmmsg() timeout behavior strangeness On 01/10/2013 04:04 AM, Steven Whitehouse wrote: > Which timeout are we talking about? I've been copied into the thread > without seeing the start of it. The discussion is about the timeout parameter for the recvmmsg() call. Currently in the recvmmsg() code it only checks the timeout after __sys_recvmsg() returns, so if __sys_recvmsg() blocks forever we could end up essentially ignoring the timeout. > If this is the rcvtimeo then afaik this is supposed to be the max time > that the call waits for data, but is overridden by MSG_DONTWAIT, for > example, on a per call basis. I'd assume that recvmmsg should work > exactly like recvmsg in this case unless there is a good reason for it > to differ, recvmsg() doesn't have a timeout parameter, so it uses SO_RCVTIMEO. recvmmsg() has an explicit timeout parameter but it doesn't look like it works properly and the documentation doesn't mention how it is supposed to interact with SO_RCVTIMEO. Chris -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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