<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>utrace_set_events_pid</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="ch02.html" title="Chapter 2. utrace core API" /><link rel="prev" href="re12.html" title="utrace_control_pid" /><link rel="next" href="re14.html" title="utrace_barrier_pid" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>utrace_set_events_pid</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re12.html">Prev</a> </td><th width="60%" align="center">Chapter 2. utrace core API</th><td width="20%" align="right"> <a accesskey="n" href="re14.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="utrace_set_events_pid"><a id="API-utrace-set-events-pid"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>utrace_set_events_pid — choose which event reports a tracing engine gets </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">__must_check int <b class="fsfunc">utrace_set_events_pid </b>(</code></td><td>struct pid * <var class="pdparam">pid</var>, </td></tr><tr><td> </td><td>struct utrace_engine * <var class="pdparam">engine</var>, </td></tr><tr><td> </td><td>unsigned long <var class="pdparam">eventmask</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2891221"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>pid</code></em></span></dt><dd><p> thread to affect </p></dd><dt><span class="term"><em class="parameter"><code>engine</code></em></span></dt><dd><p> attached engine to affect </p></dd><dt><span class="term"><em class="parameter"><code>eventmask</code></em></span></dt><dd><p> new event mask </p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2891279"></a><h2>Description</h2><p> This is the same as <code class="function">utrace_set_events</code>, but takes a <span class="structname">struct pid</span> pointer rather than a <span class="structname">struct task_struct</span> pointer. The caller must hold a ref on <em class="parameter"><code>pid</code></em>, but does not need to worry about the task staying valid. If it's been reaped so that <em class="parameter"><code>pid</code></em> points nowhere, then this call returns -<code class="constant">ESRCH</code>. </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re12.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re14.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>utrace_control_pid</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>utrace_barrier_pid</span></td></tr></table></div></body></html>