1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>usb_for_each_dev</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="usbcore.html" title="Chapter&#160;5.&#160;USB Core APIs"><link rel="prev" href="API-usb-find-interface.html" title="usb_find_interface"><link rel="next" href="API-usb-alloc-dev.html" title="usb_alloc_dev"></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_for_each_dev</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-usb-find-interface.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;5.&#160;USB Core APIs</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-usb-alloc-dev.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-usb-for-each-dev"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_for_each_dev &#8212; 
2     iterate over all USB devices in the system
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_for_each_dev </b>(</code></td><td>void * <var class="pdparam">data</var>, </td></tr><tr><td>&#160;</td><td>int (*<var class="pdparam">fn</var>)
4     <code>(</code>struct usb_device *, void *<code>)</code><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1116496212"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p>
5     data pointer that will be handed to the callback function
6    </p></dd><dt><span class="term"><em class="parameter"><code>fn</code></em></span></dt><dd><p>
7     callback function to be called for each USB device
8    </p></dd></dl></div></div><div class="refsect1"><a name="idp1116498844"></a><h2>Description</h2><p>
9   Iterate over all USB devices and call <em class="parameter"><code>fn</code></em> for each, passing it <em class="parameter"><code>data</code></em>. If it
10   returns anything other than 0, we break the iteration prematurely and return
11   that value.
12</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-usb-find-interface.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="usbcore.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-usb-alloc-dev.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">usb_find_interface</span>&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<span class="phrase">usb_alloc_dev</span></td></tr></table></div></body></html>
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