<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>function::user_string_n</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="conversions.stp.html" title="Chapter 24. String and data retrieving functions Tapset"><link rel="prev" href="API-user-string2-utf32.html" title="function::user_string2_utf32"><link rel="next" href="API-user-string-n2.html" title="function::user_string_n2"></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::user_string_n</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-user-string2-utf32.html">Prev</a> </td><th width="60%" align="center">Chapter 24. String and data retrieving functions Tapset</th><td width="20%" align="right"> <a accesskey="n" href="API-user-string-n2.html">Next</a></td></tr></table><hr></div><div class="refentry" title="function::user_string_n"><a name="API-user-string-n"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>function::user_string_n —
Retrieves string of given length from user space
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><pre class="programlisting">
user_string_n:string(addr:long,n:long)
</pre></div><div class="refsect1" title="Arguments"><a name="idp6489664"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>addr</code></em></span></dt><dd><p>
the user space address to retrieve the string from
</p></dd><dt><span class="term"><em class="parameter"><code>n</code></em></span></dt><dd><p>
the maximum length of the string (if not null terminated)
</p></dd></dl></div></div><div class="refsect1" title="Description"><a name="idp6492360"></a><h2>Description</h2><p>
Returns the C string of a maximum given length from a
given user space address. Returns <span class="quote">“<span class="quote"><unknown></span>”</span> on the rare cases
when userspace data is not accessible at the given address.
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