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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>comedi_command</title><link rel="stylesheet" type="text/css" href="comedilib.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Comedi"><link rel="up" href="functionreference.html#idp74615328" title="5.4.2.&#160;Asynchronous commands"><link rel="prev" href="func-ref-comedi-cancel.html" title="comedi_cancel"><link rel="next" href="func-ref-comedi-command-test.html" title="comedi_command_test"></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">comedi_command</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="func-ref-comedi-cancel.html">Prev</a>&#160;</td><th width="60%" align="center">5.4.2.&#160;Asynchronous commands</th><td width="20%" align="right">&#160;<a accesskey="n" href="func-ref-comedi-command-test.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="func-ref-comedi-command"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>comedi_command &#8212; start streaming input/output</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include &lt;comedilib.h&gt;</pre><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">comedi_command</b>(</code></td><td>comedi_t * <var class="pdparam">device</var>, </td></tr><tr><td>&#160;</td><td>comedi_cmd * <var class="pdparam">command</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp74588256"></a><h2>
      Description
    </h2><p>
The function <code class="function">comedi_command</code> starts a streaming input
or output.  The
command structure pointed to by <em class="parameter"><code>command</code></em> specifies
settings for the
acquisition.  The command must be able to pass
<code class="function"><a class="link" href="func-ref-comedi-command-test.html" title="comedi_command_test">comedi_command_test</a></code>
with a return value of <code class="literal">0</code>, or
<code class="function">comedi_command</code> will fail.
For input subdevices, sample values are read using the
function <code class="function">read</code> on the device file.  For output subdevices,
sample values are written using the function <code class="function">write</code>.
    </p></div><div class="refsect1"><a name="idp74583008"></a><h2>
      Return value
    </h2><p>
If successful, <code class="literal">0</code> is returned, otherwise
<code class="literal">-1</code>.
</p><p>
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