f3d75364fbebf2ddb6393e54db5e10b6f6234e14
So apparently there are two reasons why accept() can return EOPNOTSUPP: because the socket is not a listening stream socket (or similar), or because the incoming TCP connection for some reason wasn't acceptable to the host. THe latter should be a transient error, as suggested on accept(2). The former however should be considered fatal for flush_accept(). Let's fix this by explicitly checking whether the socket is a listening socket beforehand.
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