<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>function::ubacktrace</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-uaddr.html" title="function::uaddr"><link rel="next" href="API-ucallers.html" title="function::ucallers"></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::ubacktrace</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-uaddr.html">Prev</a> </td><th width="60%" align="center">Chapter 2. Context Functions</th><td width="20%" align="right"> <a accesskey="n" href="API-ucallers.html">Next</a></td></tr></table><hr></div><div class="refentry" title="function::ubacktrace"><a name="API-ubacktrace"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>function::ubacktrace —
Hex backtrace of current user-space task stack.
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><pre class="programlisting">
ubacktrace:string()
</pre></div><div class="refsect1" title="Arguments"><a name="idp3326480"></a><h2>Arguments</h2><p>
None
</p></div><div class="refsect1" title="Description"><a name="idp3327056"></a><h2>Description</h2><p>
</p><p>
Return a string of hex addresses that are a backtrace of the
stack of the current task. Output may be truncated as per maximum
string length. Returns empty string when current probe point cannot
determine user backtrace. See <code class="function">backtrace</code> for kernel traceback.
</p></div><div class="refsect1" title="Note"><a name="idp3328320"></a><h2>Note</h2><p>
To get (full) backtraces for user space applications and shared
shared libraries not mentioned in the current script run stap with
-d /path/to/exe-or-so and/or add --ldd to load all needed unwind data.
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