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Date: Mon, 09 Mar 2009 12:59:42 +0000
From: "T. Horsnell" <tsh AT mrc-lmb DOT cam DOT ac DOT uk>
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To: cygwin AT cygwin DOT com
Subject: Re: MSG_DONTWAIT on recvfrom
References: <49B4E952 DOT 3050003 AT mrc-lmb DOT cam DOT ac DOT uk> <20090309103418 DOT GT31459 AT calimero DOT vinschen DOT de>
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Corinna Vinschen wrote:
> On Mar  9 10:02, T. Horsnell wrote:
>> I'm trying to use recvfrom in non-blocking mode with the MSG_DONTWAIT flag,
>> and I get an undefined name for MSG_DONTWAIT at compile time.
>> A trawl through the mail archives gave a reference to this in 2001
>> which said:
>>
>> "Download the source for cygwin1.dll and implement MSG_DONTWAIT"
>>
>> Is this still the case (I have a recent cygwin with cygwin1.dll 1.5.25)
>> or is there a more straightforward fix?
> 
> MSG_DONTWAIT isn't supported by Winsock and it's not supported by Cygwin
> either.  I put this on my TODO list for a later release but keep in mind
> that MSG_DONTWAIT is a non-standard socket extension not backed by
> POSIX.  Consider to use O_NONBLOCK with the F_SETFL fcntl command
> instead.
> 
> 
> Corinna
> 

Righto. Thank you very much.
Terry

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