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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>snd_ctl_find_numid</title><meta name="generator" content="DocBook XSL Stylesheets V1.76.1" /><link rel="home" href="index.html" title="The ALSA Driver API" /><link rel="up" href="ch03.html#id3119772" title="General Control Interface" /><link rel="prev" href="API-snd-ctl-rename-id.html" title="snd_ctl_rename_id" /><link rel="next" href="API-snd-ctl-find-id.html" title="snd_ctl_find_id" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>snd_ctl_find_numid</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-snd-ctl-rename-id.html">Prev</a> </td><th width="60%" align="center">General Control Interface</th><td width="20%" align="right"> <a accesskey="n" href="API-snd-ctl-find-id.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="snd_ctl_find_numid"><a id="API-snd-ctl-find-numid"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>snd_ctl_find_numid —
find the control instance with the given number-id
</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 snd_kcontrol * <strong>fsfuncsnd_ctl_find_numid </strong>(</code></td><td>struct snd_card * <var class="pdparam">card</var>, </td></tr><tr><td> </td><td>unsigned int <var class="pdparam">numid</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3120710"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>card</code></em></span></dt><dd><p>
the card instance
</p></dd><dt><span class="term"><em class="parameter"><code>numid</code></em></span></dt><dd><p>
the number-id to search
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3120753"></a><h2>Description</h2><p>
Finds the control instance with the given number-id from the card.
</p><p>
Returns the pointer of the instance if found, or NULL if not.
</p><p>
The caller must down card->controls_rwsem before calling this function
(if the race condition can happen).
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