1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>seq_open</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Filesystems API"><link rel="up" href="other_functions.html" title="Other Functions"><link rel="prev" href="API-bioset-create-nobvec.html" title="bioset_create_nobvec"><link rel="next" href="API-seq-read.html" title="seq_read"></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">seq_open</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-bioset-create-nobvec.html">Prev</a>&#160;</td><th width="60%" align="center">Other Functions</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-seq-read.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-seq-open"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>seq_open &#8212; 
2  initialize sequential file
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">seq_open </b>(</code></td><td>struct file * <var class="pdparam">file</var>, </td></tr><tr><td>&#160;</td><td>const struct seq_operations * <var class="pdparam">op</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1102563020"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>file</code></em></span></dt><dd><p>
4     file we initialize
5    </p></dd><dt><span class="term"><em class="parameter"><code>op</code></em></span></dt><dd><p>
6     method table describing the sequence
7    </p></dd></dl></div></div><div class="refsect1"><a name="idp1102565660"></a><h2>Description</h2><p>
8   <code class="function">seq_open</code> sets <em class="parameter"><code>file</code></em>, associating it with a sequence described
9   by <em class="parameter"><code>op</code></em>.  <em class="parameter"><code>op</code></em>-&gt;<code class="function">start</code> sets the iterator up and returns the first
10   element of sequence. <em class="parameter"><code>op</code></em>-&gt;<code class="function">stop</code> shuts it down.  <em class="parameter"><code>op</code></em>-&gt;<code class="function">next</code>
11   returns the next element of sequence.  <em class="parameter"><code>op</code></em>-&gt;<code class="function">show</code> prints element
12   into the buffer.  In case of error -&gt;<code class="function">start</code> and -&gt;<code class="function">next</code> return
13   ERR_PTR(error).  In the end of sequence they return <code class="constant">NULL</code>. -&gt;<code class="function">show</code>
14   returns 0 in case of success and negative number in case of error.
15   Returning SEQ_SKIP means <span class="quote">&#8220;<span class="quote">discard this element and move on</span>&#8221;</span>.
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