1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>Chapter&#160;9.&#160;Symbols</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Unreliable Guide To Hacking The Linux Kernel"><link rel="up" href="index.html" title="Unreliable Guide To Hacking The Linux Kernel"><link rel="prev" href="atomic-ops.html" title="Chapter&#160;8.&#160;Atomic Operations"><link rel="next" href="sym-exportsymbols-gpl.html" title="EXPORT_SYMBOL_GPL() include/linux/export.h"></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">Chapter&#160;9.&#160;Symbols</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="atomic-ops.html">Prev</a>&#160;</td><th width="60%" align="center">&#160;</th><td width="20%" align="right">&#160;<a accesskey="n" href="sym-exportsymbols-gpl.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="symbols"></a>Chapter&#160;9.&#160;Symbols</h1></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="sect1"><a href="symbols.html#sym-exportsymbols"><code class="function">EXPORT_SYMBOL()</code>
2    <code class="filename">include/linux/export.h</code></a></span></dt><dt><span class="sect1"><a href="sym-exportsymbols-gpl.html"><code class="function">EXPORT_SYMBOL_GPL()</code>
3    <code class="filename">include/linux/export.h</code></a></span></dt></dl></div><p>
4   Within the kernel proper, the normal linking rules apply
5   (ie. unless a symbol is declared to be file scope with the
6   <span class="type">static</span> keyword, it can be used anywhere in the
7   kernel).  However, for modules, a special exported symbol table is
8   kept which limits the entry points to the kernel proper.  Modules
9   can also export symbols.
10  </p><div class="sect1"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="sym-exportsymbols"></a><code class="function">EXPORT_SYMBOL()</code>
11    <code class="filename">include/linux/export.h</code></h2></div></div></div><p>
12    This is the classic method of exporting a symbol: dynamically
13    loaded modules will be able to use the symbol as normal.
14   </p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="atomic-ops.html">Prev</a>&#160;</td><td width="20%" align="center">&#160;</td><td width="40%" align="right">&#160;<a accesskey="n" href="sym-exportsymbols-gpl.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter&#160;8.&#160;Atomic Operations&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<code class="function">EXPORT_SYMBOL_GPL()</code>
15    <code class="filename">include/linux/export.h</code></td></tr></table></div></body></html>
16