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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>sk_wait_data</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux Networking and Network Devices APIs" /><link rel="up" href="ch01s02.html" title="Socket Buffer Functions" /><link rel="prev" href="re98.html" title="sk_alloc" /><link rel="next" href="re100.html" title="__sk_mem_schedule" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>sk_wait_data</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re98.html">Prev</a> </td><th width="60%" align="center">Socket Buffer Functions</th><td width="20%" align="right"> <a accesskey="n" href="re100.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="sk_wait_data"><a id="API-sk-wait-data"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sk_wait_data —
wait for data to arrive at sk_receive_queue
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">int <b class="fsfunc">sk_wait_data </b>(</code></td><td>struct sock * <var class="pdparam">sk</var>, </td></tr><tr><td> </td><td>long * <var class="pdparam">timeo</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2732903"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>sk</code></em></span></dt><dd><p>
sock to wait on
</p></dd><dt><span class="term"><em class="parameter"><code>timeo</code></em></span></dt><dd><p>
for how long
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2732946"></a><h2>Description</h2><p>
Now socket state including sk->sk_err is changed only under lock,
hence we may omit checks after joining wait queue.
We check receive queue before <code class="function">schedule</code> only as optimization;
it is very likely that <code class="function">release_sock</code> added new data.
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