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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>user_regset_active_fn</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The utrace User Debugging Infrastructure" /><link rel="up" href="ch03.html#regset" title="struct user_regset" /><link rel="prev" href="ch03.html" title="Chapter 3. Machine State" /><link rel="next" href="re23.html" title="user_regset_get_fn" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>user_regset_active_fn</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch03.html">Prev</a> </td><th width="60%" align="center"><span class="structname">struct user_regset</span></th><td width="20%" align="right"> <a accesskey="n" href="re23.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="user_regset_active_fn"><a id="API-user-regset-active-fn"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>user_regset_active_fn —
type of <em class="parameter"><code>active</code></em> function in <span class="structname">struct user_regset</span>
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">typedef int <b class="fsfunc">user_regset_active_fn </b>(</code></td><td>struct task_struct * <var class="pdparam">target</var>, </td></tr><tr><td> </td><td>const struct user_regset * <var class="pdparam">regset</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2894056"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>target</code></em></span></dt><dd><p>
thread being examined
</p></dd><dt><span class="term"><em class="parameter"><code>regset</code></em></span></dt><dd><p>
regset being examined
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2894099"></a><h2>Description</h2><p>
Return -<code class="constant">ENODEV</code> if not available on the hardware found.
Return <code class="constant">0</code> if no interesting state in this thread.
Return ><code class="constant">0</code> number of <em class="parameter"><code>size</code></em> units of interesting state.
Any get call fetching state beyond that number will
see the default initialization state for this data,
so a caller that knows what the default state is need
not copy it all out.
This call is optional; the pointer is <code class="constant">NULL</code> if there
is no inexpensive check to yield a value < <em class="parameter"><code>n</code></em>.
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