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Date: Tue, 29 Mar 2005 10:50:31 -0600
From: Brian Ford <ford AT vss DOT fsi DOT com>
Reply-To: cygwin AT cygwin DOT com
To: Peter Stephens <ptfoof AT sbcglobal DOT net>
cc: "'Peter A. Castro'" <doctor AT fruitbat DOT org>, cygwin AT cygwin DOT com
Subject: RE: recv and errno during a connection reset/closed by peer
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On Mon, 28 Mar 2005, Peter Stephens wrote:

> FYI - I tried setting the SO_LINGER and the SO_RCVTIMEO on Linux and on
> Cygwin (see code below).  It makes sense to me that if the timeout has been
> exceeded then the recv(..., MSG_PEEK) should do something.  On Cygwin it
> doesn't do anything.

I don't have time to check, but I imagine this is just a
http://cygwin.com/acronyms/#PTC.

> On Linux it DOES time out, but it returns -1 and errno=EAGAIN.  This is an
> interesting choice for errno

Yes, it is the correct one.

> (perhaps ECONNABORTED, ESHUTDOWN, ECOMM,

definately not.  Just because a recv timed out doesn't mean the connection
is closed.

> ETIME, ETIMEDOUT,

Maybe.

> EHOSTUNREACH, or ENOLINK would have been better choices),

No as above.

> The spec is kinda vague about the response to a MSG_PEEK when the connection
> is lost, but I think that you could write a book on this subject with all
> the possible combinations.

Yup.  It's called "Unix Network Programming" by W. Richard Stevens ;-).

-- 
Brian Ford
Senior Realtime Software Engineer
VITAL - Visual Simulation Systems
FlightSafety International
the best safety device in any aircraft is a well-trained pilot...

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