1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>relay_switch_subbuf</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The Linux Kernel API"><link rel="up" href="relayfs.html#idp1125442764" title="relay interface"><link rel="prev" href="API-relay-open.html" title="relay_open"><link rel="next" href="API-relay-subbufs-consumed.html" title="relay_subbufs_consumed"></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">relay_switch_subbuf</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-relay-open.html">Prev</a>&#160;</td><th width="60%" align="center">relay interface</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-relay-subbufs-consumed.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-relay-switch-subbuf"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>relay_switch_subbuf &#8212; 
2     switch to a new sub-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">size_t <b class="fsfunc">relay_switch_subbuf </b>(</code></td><td>struct rchan_buf * <var class="pdparam">buf</var>, </td></tr><tr><td>&#160;</td><td>size_t <var class="pdparam">length</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1125478308"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>buf</code></em></span></dt><dd><p>
4     channel buffer
5    </p></dd><dt><span class="term"><em class="parameter"><code>length</code></em></span></dt><dd><p>
6     size of current event
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1125480924"></a><h2>Description</h2><p>
8   Returns either the length passed in or 0 if full.
9   </p><p>
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11   Performs sub-buffer-switch tasks such as invoking callbacks,
12   updating padding counts, waking up readers, etc.
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