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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
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-<table class="head">
- <tr>
- <td class="head-ltitle">DEV_CLONE(9)</td>
- <td class="head-vol">Kernel Developer's Manual</td>
- <td class="head-rtitle">DEV_CLONE(9)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">dev_clone</code>,
- <code class="Nm">drain_dev_clone_events</code> &#x2014;
- <span class="Nd">eventhandler for name-based device cloning in
- devfs</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<p class="Pp"><code class="In">#include
- &lt;<a class="In">sys/param.h</a>&gt;</code>
- <br/>
- <code class="In">#include &lt;<a class="In">sys/conf.h</a>&gt;</code></p>
-<p class="Pp"><var class="Ft">void</var>
- <br/>
- <code class="Fn">clone_handler</code>(<var class="Fa" style="white-space: nowrap;">void
- *arg</var>, <var class="Fa" style="white-space: nowrap;">struct ucred
- *cr</var>, <var class="Fa" style="white-space: nowrap;">char *name</var>,
- <var class="Fa" style="white-space: nowrap;">int namelen</var>,
- <var class="Fa" style="white-space: nowrap;">struct cdev **dev</var>);</p>
-<div class="Bd Pp Li">
-<pre>EVENTHANDLER_REGISTER(dev_clone, clone_handler, arg, priority);</pre>
-</div>
-<br/>
-<var class="Ft">void</var>
-<br/>
-<code class="Fn">drain_dev_clone_events</code>();
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<p class="Pp">A device driver may register a listener that will be notified each
- time a name lookup on the <a class="Xr">devfs(4)</a> mount point fails to
- find the vnode. A listener shall be registered for the
- <var class="Va">dev_clone</var> event. When called, it is supplied with the
- first argument <var class="Va">arg</var> that was specified at handler
- registration time, appropriate credentials <var class="Va">cr</var>, and a
- name <var class="Va">name</var> of length <var class="Va">namelen</var> that
- we look for. If the handler decides that the name is appropriate and wants
- to create the device that will be associated with the name, it should return
- it to devfs in the <var class="Va">dev</var> argument.</p>
-<p class="Pp" id="drain_dev_clone_events">The
- <a class="permalink" href="#drain_dev_clone_events"><code class="Fn">drain_dev_clone_events</code></a>()
- function is a barrier. It is guaranteed that all calls to eventhandlers for
- <code class="Nm">dev_clone</code> that were started before
- <code class="Fn">drain_dev_clone_events</code>() call, are finished before
- it returns control.</p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">devfs(4)</a>, <a class="Xr">namei(9)</a></p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">January 3, 2009</td>
- <td class="foot-os">FreeBSD 15.0</td>
- </tr>
-</table>