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This allows the caller to perform a non-blocking attempt, similarly to how recvmsg has MSG_DONTWAIT. If set, and we get -EAGAIN on a connection attempt, propagate the result to userspace rather than arm poll and wait for a retry. Suggested-by: Norman Maurer <norman_maurer@apple.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>