Query cancel and OOB data

OK, thanks to Tom Lane's many patches, I have query cancel working on my
machine.  However, it is not working with Unix domain sockets.  I get:

    Cannot send cancel request:
    PQrequestCancel() -- couldn't send OOB data: errno=45
    Operation not supported

This is under BSDI 3.1.

Do Unix Domain sockets support OOB(out-of-band) data?

I will commit patches soon.

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