1<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>dvb_ringbuffer_pkt_read</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Device Drivers"><link rel="up" href="ch06s02.html" title="Digital TV (DVB) devices"><link rel="prev" href="API-dvb-ringbuffer-pkt-read-user.html" title="dvb_ringbuffer_pkt_read_user"><link rel="next" href="API-dvb-ringbuffer-pkt-dispose.html" title="dvb_ringbuffer_pkt_dispose"></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">dvb_ringbuffer_pkt_read</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-dvb-ringbuffer-pkt-read-user.html">Prev</a> </td><th width="60%" align="center">Digital TV (DVB) devices</th><td width="20%" align="right"> <a accesskey="n" href="API-dvb-ringbuffer-pkt-dispose.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-dvb-ringbuffer-pkt-read"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>dvb_ringbuffer_pkt_read — 
2     Read from a packet in the ringbuffer.
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">ssize_t <b class="fsfunc">dvb_ringbuffer_pkt_read </b>(</code></td><td>struct dvb_ringbuffer * <var class="pdparam">rbuf</var>, </td></tr><tr><td> </td><td>size_t <var class="pdparam">idx</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">offset</var>, </td></tr><tr><td> </td><td>u8 * <var class="pdparam">buf</var>, </td></tr><tr><td> </td><td>size_t <var class="pdparam">len</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="id-1.8.3.23.5"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>rbuf</code></em></span></dt><dd><p>
4     Ringbuffer concerned.
5    </p></dd><dt><span class="term"><em class="parameter"><code>idx</code></em></span></dt><dd><p>
6     Packet index as returned by <code class="function"><a class="link" href="API-dvb-ringbuffer-pkt-next.html" title="dvb_ringbuffer_pkt_next">dvb_ringbuffer_pkt_next</a></code>.
7    </p></dd><dt><span class="term"><em class="parameter"><code>offset</code></em></span></dt><dd><p>
8     Offset into packet to read from.
9    </p></dd><dt><span class="term"><em class="parameter"><code>buf</code></em></span></dt><dd><p>
10     Destination buffer for data.
11    </p></dd><dt><span class="term"><em class="parameter"><code>len</code></em></span></dt><dd><p>
12     Size of destination buffer.
13    </p></dd></dl></div></div><div class="refsect1"><a name="id-1.8.3.23.6"></a><h2>Note</h2><p>
14   unlike <code class="function">dvb_ringbuffer_read_user</code>, this DOES update the read pointer
15   in the ringbuffer.
16</p></div><div class="refsect1"><a name="id-1.8.3.23.7"></a><h2>Description</h2><p>
17   returns Number of bytes read, or -EFAULT.
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