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176 lines
9.5 KiB
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Gettable socket option requirements</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
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<link rel="home" href="../../index.html" title="Asio">
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<link rel="up" href="../reference.html" title="Reference">
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<link rel="prev" href="GettableSerialPortOption.html" title="Gettable serial port option requirements">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table cellpadding="2" width="100%"><tr><td valign="top"><img alt="asio C++ library" width="250" height="60" src="../../asio.png"></td></tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="GettableSerialPortOption.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="Handler.html"><img src="../../next.png" alt="Next"></a>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="asio.reference.GettableSocketOption"></a><a class="link" href="GettableSocketOption.html" title="Gettable socket option requirements">Gettable socket
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option requirements</a>
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</h3></div></div></div>
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<p>
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A type <code class="computeroutput"><span class="identifier">X</span></code> meets the <code class="computeroutput"><span class="identifier">GettableSocketOption</span></code> requirements if it
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satisfies the requirements listed below.
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</p>
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<p>
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In the table below, <code class="computeroutput"><span class="identifier">a</span></code> denotes
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a (possibly const) value of type <code class="computeroutput"><span class="identifier">X</span></code>,
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<code class="computeroutput"><span class="identifier">b</span></code> denotes a value of type
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<code class="computeroutput"><span class="identifier">X</span></code>, <code class="computeroutput"><span class="identifier">p</span></code>
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denotes a (possibly const) value that meets the <a class="link" href="Protocol.html" title="Protocol requirements"><code class="computeroutput"><span class="identifier">Protocol</span></code></a> requirements, and <code class="computeroutput"><span class="identifier">s</span></code> denotes a (possibly const) value of a
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type that is convertible to <code class="computeroutput"><span class="identifier">size_t</span></code>
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and denotes a size in bytes.
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</p>
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<div class="table">
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<a name="asio.reference.GettableSocketOption.t0"></a><p class="title"><b>Table 20. GettableSocketOption requirements for extensible implementations</b></p>
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<div class="table-contents"><table class="table" summary="GettableSocketOption requirements for extensible implementations">
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<colgroup>
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<col>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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expression
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</p>
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</th>
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<th>
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<p>
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type
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</p>
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</th>
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<th>
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<p>
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assertion/note<br> pre/post-conditions
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">level</span><span class="special">(</span><span class="identifier">p</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="keyword">int</span></code>
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</p>
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</td>
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<td>
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<p>
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Returns a value suitable for passing as the <span class="emphasis"><em>level</em></span>
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argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html" target="_top"><code class="computeroutput"><span class="identifier">getsockopt</span><span class="special">()</span></code></a>
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(or equivalent).
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">name</span><span class="special">(</span><span class="identifier">p</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="keyword">int</span></code>
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</p>
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</td>
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<td>
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<p>
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Returns a value suitable for passing as the <span class="emphasis"><em>option_name</em></span>
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argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html" target="_top"><code class="computeroutput"><span class="identifier">getsockopt</span><span class="special">()</span></code></a>
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(or equivalent).
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">b</span><span class="special">.</span><span class="identifier">data</span><span class="special">(</span><span class="identifier">p</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="keyword">void</span><span class="special">*</span></code>
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</p>
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</td>
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<td>
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<p>
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Returns a pointer suitable for passing as the <span class="emphasis"><em>option_value</em></span>
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argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html" target="_top"><code class="computeroutput"><span class="identifier">getsockopt</span><span class="special">()</span></code></a>
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(or equivalent).
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">a</span><span class="special">.</span><span class="identifier">size</span><span class="special">(</span><span class="identifier">p</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">size_t</span></code>
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</p>
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</td>
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<td>
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<p>
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Returns a value suitable for passing as the <span class="emphasis"><em>option_len</em></span>
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argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html" target="_top"><code class="computeroutput"><span class="identifier">getsockopt</span><span class="special">()</span></code></a>
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(or equivalent), after appropriate integer conversion has been
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performed.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="identifier">b</span><span class="special">.</span><span class="identifier">resize</span><span class="special">(</span><span class="identifier">p</span><span class="special">,</span><span class="identifier">s</span><span class="special">)</span></code>
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</p>
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</td>
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<td>
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</td>
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<td>
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<p>
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post: <code class="computeroutput"><span class="identifier">b</span><span class="special">.</span><span class="identifier">size</span><span class="special">(</span><span class="identifier">p</span><span class="special">)</span>
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<span class="special">==</span> <span class="identifier">s</span></code>.<br>
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Passed the value contained in the <span class="emphasis"><em>option_len</em></span>
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argument to <span class="emphasis"><em>POSIX</em></span> <a href="http://www.opengroup.org/onlinepubs/9699919799/functions/getsockopt.html" target="_top"><code class="computeroutput"><span class="identifier">getsockopt</span><span class="special">()</span></code></a>
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(or equivalent) after successful completion of the function. Permitted
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to throw an exception if the socket option object <code class="computeroutput"><span class="identifier">b</span></code> does not support the specified
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size.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<br class="table-break">
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</div>
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<div class="copyright-footer">Copyright © 2003-2023 Christopher M. Kohlhoff<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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>)
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</p>
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</div>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="GettableSerialPortOption.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="Handler.html"><img src="../../next.png" alt="Next"></a>
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