1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>posix::basic_stream_descriptor::bytes_readable</title> 5<link rel="stylesheet" href="../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../boost_asio.html" title="Boost.Asio"> 8<link rel="up" href="../posix__basic_stream_descriptor.html" title="posix::basic_stream_descriptor"> 9<link rel="prev" href="basic_stream_descriptor/overload5.html" title="posix::basic_stream_descriptor::basic_stream_descriptor (5 of 5 overloads)"> 10<link rel="next" href="cancel.html" title="posix::basic_stream_descriptor::cancel"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="basic_stream_descriptor/overload5.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../posix__basic_stream_descriptor.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../boost_asio.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="cancel.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h4 class="title"> 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> 28</h4></div></div></div> 29<p> 30 <span class="emphasis"><em>Inherited from posix::descriptor_base.</em></span> 31 </p> 32<p> 33 <a class="indexterm" name="boost_asio.indexterm.posix__basic_stream_descriptor.bytes_readable"></a> 34IO 35 control command to get the amount of data that can be read without blocking. 36 </p> 37<pre class="programlisting">typedef implementation_defined bytes_readable; 38</pre> 39<p> 40 Implements the FIONREAD IO control command. 41 </p> 42<h6> 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> 45 </h6> 46<pre class="programlisting">boost::asio::posix::stream_descriptor descriptor(my_context); 47... 48boost::asio::descriptor_base::bytes_readable command(true); 49descriptor.io_control(command); 50std::size_t bytes_readable = command.get(); 51</pre> 52<h6> 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> 55 </h6> 56<p> 57 <span class="emphasis"><em>Header: </em></span><code class="literal">boost/asio/posix/basic_stream_descriptor.hpp</code> 58 </p> 59<p> 60 <span class="emphasis"><em>Convenience header: </em></span><code class="literal">boost/asio.hpp</code> 61 </p> 62</div> 63<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 64<td align="left"></td> 65<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M. 66 Kohlhoff<p> 67 Distributed under the Boost Software License, Version 1.0. (See accompanying 68 file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) 69 </p> 70</div></td> 71</tr></table> 72<hr> 73<div class="spirit-nav"> 74<a accesskey="p" href="basic_stream_descriptor/overload5.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../posix__basic_stream_descriptor.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../../boost_asio.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="cancel.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a> 75</div> 76</body> 77</html> 78
