1<html><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 V1.78.1"><link rel="home" href="index.html" title="The ALSA Driver API"><link rel="up" href="ch03.html#idp1094472508" 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 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">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>&#160;</td><th width="60%" align="center">General Control Interface</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-snd-ctl-find-id.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-snd-ctl-find-numid"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>snd_ctl_find_numid &#8212; 
2     find the control instance with the given number-id
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">struct snd_kcontrol * <b class="fsfunc">snd_ctl_find_numid </b>(</code></td><td>struct snd_card * <var class="pdparam">card</var>, </td></tr><tr><td>&#160;</td><td>unsigned int <var class="pdparam">numid</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1094567500"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>card</code></em></span></dt><dd><p>
4     the card instance
5    </p></dd><dt><span class="term"><em class="parameter"><code>numid</code></em></span></dt><dd><p>
6     the number-id to search
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1094570140"></a><h2>Description</h2><p>
8   Finds the control instance with the given number-id from the card.
9   </p><p>
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11   The caller must down card-&gt;controls_rwsem before calling this function
12   (if the race condition can happen).
13</p></div><div class="refsect1"><a name="idp1094571244"></a><h2>Return</h2><p>
14   The pointer of the instance if found, or <code class="constant">NULL</code> if not.
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