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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>function::ustack</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"><link rel="home" href="index.html" title="SystemTap Tapset Reference Manual"><link rel="up" href="context_stp.html" title="Chapter 2. Context Functions"><link rel="prev" href="API-user-mode.html" title="function::user_mode"><link rel="next" href="API-usymdata.html" title="function::usymdata"></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>function::ustack</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-user-mode.html">Prev</a> </td><th width="60%" align="center">Chapter 2. Context Functions</th><td width="20%" align="right"> <a accesskey="n" href="API-usymdata.html">Next</a></td></tr></table><hr></div><div class="refentry" title="function::ustack"><a name="API-ustack"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>function::ustack —
Return address at given depth of user stack backtrace
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><pre class="programlisting">
ustack:long(n:long)
</pre></div><div class="refsect1" title="Arguments"><a name="idp5582528"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>n</code></em></span></dt><dd><p>
number of levels to descend in the stack.
</p></dd></dl></div></div><div class="refsect1" title="Description"><a name="idp5585584"></a><h2>Description</h2><p>
Performs a simple (user space) backtrace, and returns the
element at the specified position. The results of the backtrace itself
are cached, so that the backtrace computation is performed at most once
no matter how many times <code class="function">ustack</code> is called, or in what order.
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