1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>pid_alive</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Device Drivers"><link rel="up" href="ch01s03.html" title="Delaying, scheduling, and timer routines"><link rel="prev" href="API-struct-thread-group-cputimer.html" title="struct thread_group_cputimer"><link rel="next" href="API-is-global-init.html" title="is_global_init"></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 class="phrase">pid_alive</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-struct-thread-group-cputimer.html">Prev</a>&#160;</td><th width="60%" align="center">Delaying, scheduling, and timer routines</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-is-global-init.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-pid-alive"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>pid_alive &#8212; 
2     check that a task structure is not stale
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">pid_alive </b>(</code></td><td>const struct task_struct * <var class="pdparam">p</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1106699628"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>p</code></em></span></dt><dd><p>
4     Task structure to be checked.
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1106701204"></a><h2>Description</h2><p>
6   Test if a process is not yet dead (at most zombie state)
7   If pid_alive fails, then pointers within the task structure
8   can be stale and must not be dereferenced.
9</p></div><div class="refsect1"><a name="idp1106701956"></a><h2>Return</h2><p>
10   1 if the process is alive. 0 otherwise.
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