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<h3 class="section">31.4 Using <code>sysconf</code></h3>

<p>When your system has configurable system limits, you can use the
<code>sysconf</code> function to find out the value that applies to any
particular machine.  The function and the associated <var>parameter</var>
constants are declared in the header file <samp><span class="file">unistd.h</span></samp>.

<ul class="menu">
<li><a accesskey="1" href="Sysconf-Definition.html#Sysconf-Definition">Sysconf Definition</a>:         Detailed specifications of <code>sysconf</code>. 
<li><a accesskey="2" href="Constants-for-Sysconf.html#Constants-for-Sysconf">Constants for Sysconf</a>:      The list of parameters <code>sysconf</code> can read. 
<li><a accesskey="3" href="Examples-of-Sysconf.html#Examples-of-Sysconf">Examples of Sysconf</a>:        How to use <code>sysconf</code> and the parameter
				 macros properly together. 
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