1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>snd_pcm_lib_alloc_vmalloc_buffer</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="ch02.html#idp1093485324" title="PCM Core"><link rel="prev" href="API-snd-pcm-gettime.html" title="snd_pcm_gettime"><link rel="next" href="API-snd-pcm-lib-alloc-vmalloc-32-buffer.html" title="snd_pcm_lib_alloc_vmalloc_32_buffer"></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_pcm_lib_alloc_vmalloc_buffer</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-snd-pcm-gettime.html">Prev</a>&#160;</td><th width="60%" align="center">PCM Core</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-snd-pcm-lib-alloc-vmalloc-32-buffer.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-snd-pcm-lib-alloc-vmalloc-buffer"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>snd_pcm_lib_alloc_vmalloc_buffer &#8212; 
2     allocate virtual DMA buffer
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">snd_pcm_lib_alloc_vmalloc_buffer </b>(</code></td><td>struct snd_pcm_substream * <var class="pdparam">substream</var>, </td></tr><tr><td>&#160;</td><td>size_t <var class="pdparam">size</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1094093188"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>substream</code></em></span></dt><dd><p>
4     the substream to allocate the buffer to
5    </p></dd><dt><span class="term"><em class="parameter"><code>size</code></em></span></dt><dd><p>
6     the requested buffer size, in bytes
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1094095780"></a><h2>Description</h2><p>
8   Allocates the PCM substream buffer using <code class="function">vmalloc</code>, i.e., the memory is
9   contiguous in kernel virtual space, but not in physical memory.  Use this
10   if the buffer is accessed by kernel code but not by device DMA.
11</p></div><div class="refsect1"><a name="idp1094096900"></a><h2>Return</h2><p>
12   1 if the buffer was changed, 0 if not changed, or a negative error
13   code.
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