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Inherited from posix::descriptor.

Release ownership of the native descriptor implementation.

native_handle_type release();

This function may be used to obtain the underlying representation of the descriptor. After calling this function, is_open() returns false. The caller is responsible for closing the descriptor.

All outstanding asynchronous read or write operations will finish immediately, and the handlers for cancelled operations will be passed the boost::asio::error::operation_aborted error.