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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>ipc_findkey</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The Linux Kernel API" /><link rel="up" href="ch05.html#id2654382" title="IPC utilities" /><link rel="prev" href="re236.html" title="ipc_init_proc_interface" /><link rel="next" href="re238.html" title="ipc_get_maxid" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>ipc_findkey</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re236.html">Prev</a> </td><th width="60%" align="center">IPC utilities</th><td width="20%" align="right"> <a accesskey="n" href="re238.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="ipc_findkey"><a id="API-ipc-findkey"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ipc_findkey —
find a key in an ipc identifier set
</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">struct kern_ipc_perm * <b class="fsfunc">ipc_findkey </b>(</code></td><td>struct ipc_ids * <var class="pdparam">ids</var>, </td></tr><tr><td> </td><td>key_t <var class="pdparam">key</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2654910"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>ids</code></em></span></dt><dd><p>
Identifier set
</p></dd><dt><span class="term"><em class="parameter"><code>key</code></em></span></dt><dd><p>
The key to find
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2654953"></a><h2>Description</h2><p>
Requires ipc_ids.rw_mutex locked.
Returns the LOCKED pointer to the ipc structure if found or NULL
if not.
If key is found ipc points to the owning ipc structure
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