If you view the tcp traffic with Wireshark, it might help corroborate your
theory. Maybe you can see FIN from both sides and that would confirm your
thinking. ??
— jrj
> On Jan 17, 2018, at 2:22 PM, Jens Alfke <j...@mooseyard.com> wrote:
>
> I’m using NSURLSessionStreamTask to implement a WebSocket client. About half
> the time when I close the connection, my delegate callback gets an error
> ENOTCONN. As far as I can tell, this error is bogus: there seems to be a race
> condition where both the server and the client are closing the socket, and
> sometimes when CFNetwork closes the socket it’s already been marked as
> closed, hence the error.
>
> The sequence of events looks like:
> 1. I send a WebSocket CLOSE message
> 2. Something logs the message "TIC TCP Conn Missing Error [2:0x610000033d40]:
> Generating 1:54”
> 3. I receive the confirming CLOSE message from the server
> 4. Something logs "TIC Read Status [2:0x610000033d40]: 1:57”
> 5. I call -closeWrite and -closeRead on the NSURLSessionStreamTask
> 6. My -URLSession:readClosedForStreamTask: and
> -URLSession:writeClosedForStreamTask: delegate methods are called
> 7. My -URLSession:task:didCompleteWithError: delegate method is called, with
> an error {NSPOSIXErrorDomain, 57, “Socket is not connected”}. (57 = ENOTCONN.)
>
> The other half of the time it goes exactly the same way except that in the
> last step the error parameter is nil.
>
> As I said, I believe this error is bogus, so I’m updating my delegate method
> to ignore this specific error if I’ve already closed the streams. But I’d
> like to make sure my analysis and workaround are correct.
>
> —Jens
>
> PS: Running on macOS 10.13.2, and building with Xcode 9.2.
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