1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>memzero_explicit</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The Linux Kernel API"><link rel="up" href="ch02s02.html" title="String Manipulation"><link rel="prev" href="API-memset.html" title="memset"><link rel="next" href="API-memcpy.html" title="memcpy"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">memzero_explicit</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-memset.html">Prev</a>&#160;</td><th width="60%" align="center">String Manipulation</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-memcpy.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-memzero-explicit"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>memzero_explicit &#8212; 
2     Fill a region of memory (e.g. sensitive keying data) with 0s.
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <b class="fsfunc">memzero_explicit </b>(</code></td><td>void * <var class="pdparam">s</var>, </td></tr><tr><td>&#160;</td><td>size_t <var class="pdparam">count</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1122997628"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>s</code></em></span></dt><dd><p>
4     Pointer to the start of the area.
5    </p></dd><dt><span class="term"><em class="parameter"><code>count</code></em></span></dt><dd><p>
6     The size of the area.
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1123000204"></a><h2>Note</h2><p>
8   usually using <code class="function">memset</code> is just fine (!), but in cases
9   where clearing out _local_ data at the end of a scope is
10   necessary, <code class="function">memzero_explicit</code> should be used instead in
11   order to prevent the compiler from optimising away zeroing.
12   </p><p>
13
14   <code class="function">memzero_explicit</code> doesn't need an arch-specific version as
15   it just invokes the one of <code class="function">memset</code> implicitly.
16</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-memset.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="ch02s02.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-memcpy.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">memset</span>&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<span class="phrase">memcpy</span></td></tr></table></div></body></html>
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