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#### posix::descriptor_base::bytes_readable

IO control command to get the amount of data that can be read without blocking.

    typedef implementation_defined bytes_readable;

Implements the FIONREAD IO control command.

###### Example

    boost::asio::posix::stream_descriptor descriptor(io_service);
    ...
    boost::asio::descriptor_base::bytes_readable command(true);
    descriptor.io_control(command);
    std::size_t bytes_readable = command.get();