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authormcermak <mcermak>2014-05-16 17:59:58 +0000
committermcermak <mcermak>2014-05-16 17:59:58 +0000
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1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>function::ucallers</title><meta name="generator" content="DocBook XSL Stylesheets V1.76.1"><link rel="home" href="index.html" title="SystemTap Tapset Reference Manual"><link rel="up" href="context_stp.html" title="Chapter&#160;2.&#160;Context Functions"><link rel="prev" href="API-ubacktrace.html" title="function::ubacktrace"><link rel="next" href="API-uid.html" title="function::uid"></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::ucallers</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-ubacktrace.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;2.&#160;Context Functions</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-uid.html">Next</a></td></tr></table><hr></div><div class="refentry" title="function::ucallers"><a name="API-ucallers"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>function::ucallers &#8212;
2 Return first n elements of user stack backtrace
3 </p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><pre class="programlisting">
4 ucallers:string(n:long)
5</pre></div><div class="refsect1" title="Arguments"><a name="idp5638784"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>n</code></em></span></dt><dd><p>
6 number of levels to descend in the stack (not counting the top
7 level). If n is -1, print the entire stack.
8 </p></dd></dl></div></div><div class="refsect1" title="Description"><a name="idp5641984"></a><h2>Description</h2><p>
9 This function returns a string of the first n hex
10 addresses from the backtrace of the user stack. Output may be
11 truncated as per maximum string length (MAXSTRINGLEN).
12</p></div><div class="refsect1" title="Note"><a name="idp5643328"></a><h2>Note</h2><p>
13 To get (full) backtraces for user space applications and shared
14 shared libraries not mentioned in the current script run stap with
15 -d /path/to/exe-or-so and/or add --ldd to load all needed unwind data.
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-ubacktrace.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="context_stp.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-uid.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>function::ubacktrace</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>function::uid</span></td></tr></table></div></body></html>