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This allows an application to call connect() in an async fashion. Like other opcodes, we first try a non-blocking connect, then punt to async context if we have to. Note that we can still return -EINPROGRESS, and in that case the caller should use IORING_OP_POLL_ADD to do an async wait for completion of the connect request (just like for regular connect(2), except we can do it async here too). Signed-off-by: Jens Axboe <axboe@kernel.dk>