<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>I/O control command requirements</title> <link rel="stylesheet" href="../../boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2"> <link rel="start" href="../../index.html" title="Asio"> <link rel="up" href="../reference.html" title="Reference"> <link rel="prev" href="InternetProtocol.html" title="Internet protocol requirements"> <link rel="next" href="IoObjectService.html" title="I/O object service requirements"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="InternetProtocol.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="IoObjectService.html"><img src="../../next.png" alt="Next"></a> </div> <div class="section" lang="en"> <div class="titlepage"><div><div><h3 class="title"> <a name="asio.reference.IoControlCommand"></a><a class="link" href="IoControlCommand.html" title="I/O control command requirements">I/O control command requirements</a> </h3></div></div></div> <p> In the table below, <code class="computeroutput"><span class="identifier">X</span></code> denotes an I/O control command class, <code class="computeroutput"><span class="identifier">a</span></code> denotes a value of <code class="computeroutput"><span class="identifier">X</span></code>, and <code class="computeroutput"><span class="identifier">u</span></code> denotes an identifier. </p> <div class="table"> <a name="id692262"></a><p class="title"><b>Table 16. IoControlCommand requirements</b></p> <div class="table-contents"><table class="table" summary="IoControlCommand requirements"> <colgroup> <col> <col> <col> </colgroup> <thead><tr> <th> <p> expression </p> </th> <th> <p> type </p> </th> <th> <p> assertion/note\npre/post-conditions </p> </th> </tr></thead> <tbody> <tr> <td> <p> <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">name</span><span class="special">();</span></code> </p> </td> <td> <p> <code class="computeroutput"><span class="keyword">int</span></code> </p> </td> <td> <p> Returns a value suitable for passing as the <span class="emphasis"><em>request</em></span> argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/000095399/functions/ioctl.html" target="_top"><code class="computeroutput"><span class="identifier">ioctl</span><span class="special">()</span></code></a> (or equivalent). </p> </td> </tr> <tr> <td> <p> <code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">data</span><span class="special">();</span></code> </p> </td> <td> <p> a pointer, convertible to <code class="computeroutput"><span class="keyword">void</span><span class="special">*</span></code> </p> </td> <td> </td> </tr> </tbody> </table></div> </div> <br class="table-break"> </div> <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> <td align="left"></td> <td align="right"><div class="copyright-footer">Copyright © 2003 - 2010 Christopher M. Kohlhoff<p> Distributed under the Boost Software License, Version 1.0. (See accompanying 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>) </p> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="InternetProtocol.html"><img src="../../prev.png" alt="Prev"></a><a accesskey="u" href="../reference.html"><img src="../../up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../home.png" alt="Home"></a><a accesskey="n" href="IoObjectService.html"><img src="../../next.png" alt="Next"></a> </div> </body> </html>