DomainKey-Signature: a=rsa-sha1; c=nofws; d=sourceware.org; h=list-id
	:list-unsubscribe:list-subscribe:list-archive:list-post
	:list-help:sender:message-id:date:from:mime-version:to:subject
	:references:in-reply-to:content-type:content-transfer-encoding;
	 q=dns; s=default; b=jtJTfk2T52bllEmVq/q6rk4/3ZRjGryJotXbvBvhgtW
	r+hHipDsf8ltWiv4DznntIkSF00d1jQ+HsLvys2Zr+fNpZiMD3d7mA3401GwDJhR
	3cpqxmJirk05FfcurLiRxgLvAbgeSdAsXqg47ttXqYNL014AfGbmImiFx0Vtlz6U
	=
Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm
Sender: cygwin-owner@cygwin.com
Mail-Followup-To: cygwin@cygwin.com
Message-ID: <51D6BF0B.5030002@tiscali.co.uk>
Date: Fri, 05 Jul 2013 13:41:47 +0100
From: David Stacey <drstacey@tiscali.co.uk>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7
MIME-Version: 1.0
To: cygwin@cygwin.com
Subject: Re: recv() timeout problem
References: <51D5C042.3070307@tiscali.co.uk> <20130705090044.GA4009@calimero.vinschen.de>
In-Reply-To: <20130705090044.GA4009@calimero.vinschen.de>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit

On 05/07/13 10:00, Corinna Vinschen wrote:
> On Jul  4 19:34, David Stacey wrote:
>> >Please find attached a short programme that demonstrates a problem
>> >I'm having with recv() timeouts. Under Fedora 19 x64, the test
>> >programme times out after three seconds (which is the desired
>> >behaviour). However, when run from Cygwin, the call to recv() never
>> >exits.
>> >
>> >I am using the latest snapshot (2013-07-03) in 32-bit Cygwin. OS is
>> >Windows 7 Ultimate x64 SP1.
>> >
>> >Many thanks in advance for your help,
> Unfortunately that won't work at the moment.
>
> The underlying implementation of recv is nonblocking.  A blocking
> Windows recv call is noninterruptible, unfortunately (at least up to
> Windows 2003), so this was necessary to handle signals or
> thread-cancellation.
>
> Due to its nonblocking nature under the hood, this doesn't support
> SO_RCVTIMEO and SO_SNDTIMEO and, surprisingly, we never had a complaint
> about that, despite its age.
>
> I can't promise a quick solution, but I put implementing handling of
> SO_RCVTIMEO and SO_SNDTIMEO in recv/send on my TODO list.  Of course,
> patches are welcome, too.
>
> For the time being, I suggest to use select or poll with timeout
> instead.

Thank you for your e-mail, and for replying so quickly. Regarding the 
recv() timeouts: no problem, it's easy enough to work around. On your 
TODO list, file this one under things to do when you've finally got that 
cat.

I think that's the last of my Poco problems out of the way. I'll give it 
a clean build and test, and send an ITP either this evening or tomorrow.

Thanks once again for your help,

Dave.


--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple