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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_enable_single_step</title><meta name="generator" content="DocBook XSL Stylesheets V1.76.1" /><link rel="home" href="index.html" title="The utrace User Debugging Infrastructure" /><link rel="up" href="arch.html#arch-ptrace" title="<asm/ptrace.h>" /><link rel="prev" href="API-arch-has-block-step.html" title="arch_has_block_step" /><link rel="next" href="API-user-enable-block-step.html" title="user_enable_block_step" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>user_enable_single_step</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-arch-has-block-step.html">Prev</a> </td><th width="60%" align="center"><code class="filename"><asm/ptrace.h></code></th><td width="20%" align="right"> <a accesskey="n" href="API-user-enable-block-step.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="user_enable_single_step"><a id="API-user-enable-single-step"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>user_enable_single_step —
single-step in user-mode task
</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">void <strong>fsfuncuser_enable_single_step </strong>(</code></td><td>struct task_struct * <var class="pdparam">task</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2778663"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>task</code></em></span></dt><dd><p>
either current or a task stopped in <code class="constant">TASK_TRACED</code>
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2778696"></a><h2>Description</h2><p>
This can only be called when <code class="function">arch_has_single_step</code> has returned nonzero.
Set <em class="parameter"><code>task</code></em> so that when it returns to user mode, it will trap after the
next single instruction executes. If <code class="function">arch_has_block_step</code> is defined,
this must clear the effects of <code class="function">user_enable_block_step</code> too.
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