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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>parport_wait_event</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux Device Drivers" /><link rel="up" href="ch03.html" title="Chapter 3. Parallel Port Devices" /><link rel="prev" href="re277.html" title="parport_yield_blocking" /><link rel="next" href="re279.html" title="parport_wait_peripheral" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>parport_wait_event</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re277.html">Prev</a> </td><th width="60%" align="center">Chapter 3. Parallel Port Devices</th><td width="20%" align="right"> <a accesskey="n" href="re279.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="parport_wait_event"><a id="API-parport-wait-event"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>parport_wait_event —
wait for an event on a parallel port
</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">parport_wait_event </b>(</code></td><td>struct parport * <var class="pdparam">port</var>, </td></tr><tr><td> </td><td>signed long <var class="pdparam">timeout</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2634229"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>port</code></em></span></dt><dd><p>
port to wait on
</p></dd><dt><span class="term"><em class="parameter"><code>timeout</code></em></span></dt><dd><p>
time to wait (in jiffies)
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2634273"></a><h2>Description</h2><p>
This function waits for up to <em class="parameter"><code>timeout</code></em> jiffies for an
interrupt to occur on a parallel port. If the port timeout is
set to zero, it returns immediately.
</p><p>
If an interrupt occurs before the timeout period elapses, this
function returns zero immediately. If it times out, it returns
one. An error code less than zero indicates an error (most
likely a pending signal), and the calling code should finish
what it's doing as soon as it can.
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