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Inherited from posix::basic_descriptor.
Gets the non-blocking mode of the descriptor.
bool non_blocking() const;
true if the descriptor's
synchronous operations will fail with asio::error::would_block
if they are unable to perform the requested operation immediately. If
false, synchronous operations
will block until complete.
The non-blocking mode has no effect on the behaviour of asynchronous
operations. Asynchronous operations will never fail with the error asio::error::would_block.