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Date: Fri, 02 Sep 2011 15:59:55 +0300
From: Andriy Gapon <avg@FreeBSD.org>
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To: Andrey Chernov <ache@FreeBSD.org>, Jilles Tjoelker <jilles@stack.nl>,
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Subject: Re: POLLHUP on never connected socket
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on 02/09/2011 14:21 Andrey Chernov said the following:
> On Fri, Sep 02, 2011 at 02:04:34PM +0300, Andriy Gapon wrote:
>> on 02/09/2011 13:40 Jilles Tjoelker said the following:
>>> Ports people have complained about poll() behaviour before, are there
>>> configure scripts that attempt to check if we ever return POLLHUP alone
>>> and only check for POLLIN if not?
>>
>> Not sure about that other software and how POLLIN is related here.
>> The software in question (mozilla nspr) checks for POLLNVAL, POLLERR, POLLPRI
>> and POLLOUT to determine if anything interesting has happened to a connection
>> supposed to be in progress.  They aren't checking for POLLHUP at all and thus
>> they keep thinking that the connection is still in progress when they get it.
> 
> It seems for such case it should return POLLERR too.
> 

I think that I would agree as this is not a graceful disconnect / hang-up but an
error in trying to connect.  Anyway I am not an expert in this matters and I'd
think that POLLHUP should be checked anyway - better safe than sorry.

-- 
Andriy Gapon