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27 <a name="boost_asio.reference.posix__basic_stream_descriptor.bytes_readable"></a><a class="link" href="bytes_readable.html" title="posix::basic_stream_descriptor::bytes_readable">posix::basic_stream_descriptor::bytes_readable</a>
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30 <span class="emphasis"><em>Inherited from posix::descriptor_base.</em></span>
33 <a class="indexterm" name="boost_asio.indexterm.posix__basic_stream_descriptor.bytes_readable"></a>
35 control command to get the amount of data that can be read without blocking.
37 <pre class="programlisting">typedef implementation_defined bytes_readable;
40 Implements the FIONREAD IO control command.
43 <a name="boost_asio.reference.posix__basic_stream_descriptor.bytes_readable.h0"></a>
44 <span class="phrase"><a name="boost_asio.reference.posix__basic_stream_descriptor.bytes_readable.example"></a></span><a class="link" href="bytes_readable.html#boost_asio.reference.posix__basic_stream_descriptor.bytes_readable.example">Example</a>
46 <pre class="programlisting">boost::asio::posix::stream_descriptor descriptor(my_context);
48 boost::asio::descriptor_base::bytes_readable command(true);
49 descriptor.io_control(command);
50 std::size_t bytes_readable = command.get();
53 <a name="boost_asio.reference.posix__basic_stream_descriptor.bytes_readable.h1"></a>
54 <span class="phrase"><a name="boost_asio.reference.posix__basic_stream_descriptor.bytes_readable.requirements"></a></span><a class="link" href="bytes_readable.html#boost_asio.reference.posix__basic_stream_descriptor.bytes_readable.requirements">Requirements</a>
57 <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/posix/basic_stream_descriptor.hpp</code>
60 <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code>
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