1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>usb_interface_claimed</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The Linux-USB Host Side API"><link rel="up" href="hostside.html" title="Chapter&#160;4.&#160;Host-Side Data Types and Macros"><link rel="prev" href="API-usb-hub-for-each-child.html" title="usb_hub_for_each_child"><link rel="next" href="API-usb-make-path.html" title="usb_make_path"></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">usb_interface_claimed</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-usb-hub-for-each-child.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;4.&#160;Host-Side Data Types and Macros</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-usb-make-path.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-usb-interface-claimed"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_interface_claimed &#8212; 
2     returns true iff an interface is claimed
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">usb_interface_claimed </b>(</code></td><td>struct usb_interface * <var class="pdparam">iface</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1115649932"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>iface</code></em></span></dt><dd><p>
4     the interface being checked
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1115651508"></a><h2>Return</h2><p>
6   <code class="constant">true</code> (nonzero) iff the interface is claimed, else <code class="constant">false</code>
7   (zero).
8</p></div><div class="refsect1"><a name="idp1115652524"></a><h2>Note</h2><p>
9   Callers must own the driver model's usb bus readlock.  So driver
10   <code class="function">probe</code> entries don't need extra locking, but other call contexts
11   may need to explicitly claim that lock.
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