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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>snd_dma_get_reserved_buf</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="ch01s04.html" title="Memory Management Helpers" /><link rel="prev" href="API-snd-dma-free-pages.html" title="snd_dma_free_pages" /><link rel="next" href="API-snd-dma-reserve-buf.html" title="snd_dma_reserve_buf" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">snd_dma_get_reserved_buf</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-snd-dma-free-pages.html">Prev</a>&#160;</td><th width="60%" align="center">Memory Management Helpers</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-snd-dma-reserve-buf.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-snd-dma-get-reserved-buf"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>snd_dma_get_reserved_buf &#8212; 
     get the reserved buffer for the given device
 </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">size_t <strong class="fsfunc">snd_dma_get_reserved_buf </strong>(</code></td><td>struct snd_dma_buffer * <var class="pdparam">dmab</var>, </td></tr><tr><td>&#160;</td><td>unsigned int <var class="pdparam">id</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a id="idm140249671050272"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>dmab</code></em></span></dt><dd><p>
     the buffer allocation record to store
    </p></dd><dt><span class="term"><em class="parameter"><code>id</code></em></span></dt><dd><p>
     the buffer id
    </p></dd></dl></div></div><div class="refsect1"><a id="idm140249671045312"></a><h2>Description</h2><p>
   Looks for the reserved-buffer list and re-uses if the same buffer
   is found in the list.  When the buffer is found, it's removed from the free list.
</p></div><div class="refsect1"><a id="idm140249671043984"></a><h2>Return</h2><p>
   The size of buffer if the buffer is found, or zero if not found.
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