I've just realized an exception in the sending data while using
PQsendCopyData(). Function's blocking behaviour is not guaranteed,
therefore a

        if (PQisnonblocking())
                PQsetnonblocking(conn, 0)

kind of phrase required before using PQsendCopyData(). But after a
small investigation, found that both psql and pg_dump runs in
blocking mode - without any PQsetnonblocking() call. Thus, AFAIC,
above phrase isn't necessary.

FYI. Just wanted to inform. Any comments are welcome.


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