netdev - Re: Fw: [Bug 8013] New: select for write hangs on a socket after write returned ECONNRESET

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Message-ID: <20070216153957.GB22020@2ka.mipt.ru>
Date:	Fri, 16 Feb 2007 18:39:58 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Stephen Hemminger <shemminger@...ux-foundation.org>
Cc:	netdev@...r.kernel.org
Subject: Re: Fw: [Bug 8013] New: select for write hangs on a socket after write returned ECONNRESET

On Fri, Feb 16, 2007 at 06:28:58PM +0300, Evgeniy Polyakov (johnpol@....mipt.ru) wrote:
> On Fri, Feb 16, 2007 at 06:25:57PM +0300, Evgeniy Polyakov (johnpol@....mipt.ru) wrote:
> > On Thu, Feb 15, 2007 at 04:04:05PM -0800, Stephen Hemminger (shemminger@...ux-foundation.org) wrote:
> > > Someone want to take a stab at fixing this??

Ok, I've fund a reason - select() only checks if valid output condition
is 
#define POLLOUT_SET (POLLWRBAND | POLLWRNORM | POLLOUT | POLLERR)

Linux never sets POLLERR on shutdown - only on socket error, on shutdown
POLLHUP is setup instead, so reading always shows that:

#define POLLIN_SET (POLLRDNORM | POLLRDBAND | POLLIN | POLLHUP |
POLLERR)

A 'fix' can be to add POLLHUP into POLLOUT_SET or workaround that in
application to check both input and output events in select() or use
poll and explicitly check returned mask.

-- 
	Evgeniy Polyakov
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