1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>cmf_read</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Writing s390 channel device drivers"><link rel="up" href="cmf.html" title="The channel-measurement facility"><link rel="prev" href="API-disable-cmf.html" title="disable_cmf"><link rel="next" href="API-cmf-readall.html" title="cmf_readall"></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">cmf_read</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-disable-cmf.html">Prev</a>&#160;</td><th width="60%" align="center">The channel-measurement facility</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-cmf-readall.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-cmf-read"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>cmf_read &#8212; 
2     read one value from the current channel measurement block
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">u64 <b class="fsfunc">cmf_read </b>(</code></td><td>struct ccw_device * <var class="pdparam">cdev</var>, </td></tr><tr><td>&#160;</td><td>int <var class="pdparam">index</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1124488164"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>cdev</code></em></span></dt><dd><p>
4     the channel to be read
5    </p></dd><dt><span class="term"><em class="parameter"><code>index</code></em></span></dt><dd><p>
6     the index of the value to be read
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1124490740"></a><h2>Description</h2><p>
8   Returns the value read or <code class="constant">0</code> if the value cannot be read.
9</p></div><div class="refsect1"><a name="idp1124491588"></a><h2>Context</h2><p>
10   any
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