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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:43 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:55:43 -0400
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+<table class="head">
+ <tr>
+ <td class="head-ltitle">DEV_MODULE(9)</td>
+ <td class="head-vol">Kernel Developer's Manual</td>
+ <td class="head-rtitle">DEV_MODULE(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_MODULE</code> &#x2014;
+ <span class="Nd">device driver module declaration macro</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/kernel.h</a>&gt;</code>
+ <br/>
+ <code class="In">#include &lt;<a class="In">sys/module.h</a>&gt;</code>
+ <br/>
+ <code class="In">#include &lt;<a class="In">sys/conf.h</a>&gt;</code></p>
+<p class="Pp"><code class="Fn">DEV_MODULE</code>(<var class="Fa" style="white-space: nowrap;">name</var>,
+ <var class="Fa" style="white-space: nowrap;">modeventhand_t evh</var>,
+ <var class="Fa" style="white-space: nowrap;">void *arg</var>);</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
+<p class="Pp">The
+ <a class="permalink" href="#DEV_MODULE"><code class="Fn" id="DEV_MODULE">DEV_MODULE</code></a>()
+ macro declares a device driver kernel module. It fills in a
+ <var class="Vt">moduledata_t</var> structure and then calls
+ <a class="permalink" href="#DECLARE_MODULE"><code class="Fn" id="DECLARE_MODULE">DECLARE_MODULE</code></a>()
+ with the correct args, where <var class="Fa">name</var> is the name of the
+ module and <var class="Fa">evh</var> (with its argument
+ <var class="Fa">arg</var>) is the event handler for the module (refer to
+ <a class="Xr">DECLARE_MODULE(9)</a> for more information). The event handler
+ is supposed to create the device with
+ <a class="permalink" href="#make_dev"><code class="Fn" id="make_dev">make_dev</code></a>()
+ on load and to destroy it when it is unloaded using
+ <a class="permalink" href="#destroy_dev"><code class="Fn" id="destroy_dev">destroy_dev</code></a>().</p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="EXAMPLES"><a class="permalink" href="#EXAMPLES">EXAMPLES</a></h1>
+<div class="Bd Li">
+<pre>#include &lt;sys/module.h&gt;
+#include &lt;sys/conf.h&gt;
+
+static struct cdevsw foo_devsw = { ... };
+
+static struct cdev *sdev;
+
+static int
+foo_load(module_t mod, int cmd, void *arg)
+{
+ int err = 0;
+
+ switch (cmd) {
+ case MOD_LOAD:
+ sdev = make_dev(&amp;foo_devsw, 0, UID_ROOT, GID_WHEEL, 0600, &quot;foo&quot;);
+ break; /* Success*/
+
+ case MOD_UNLOAD:
+ case MOD_SHUTDOWN:
+ destroy_dev(sdev);
+ break; /* Success*/
+
+ default:
+ err = EINVAL;
+ break;
+ }
+
+ return(err);
+}
+
+DEV_MODULE(foo, foo_load, NULL);</pre>
+</div>
+</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">DECLARE_MODULE(9)</a>,
+ <a class="Xr">destroy_dev(9)</a>, <a class="Xr">make_dev(9)</a>,
+ <a class="Xr">module(9)</a></p>
+</section>
+<section class="Sh">
+<h1 class="Sh" id="AUTHORS"><a class="permalink" href="#AUTHORS">AUTHORS</a></h1>
+<p class="Pp">This manual page was written by <span class="An">Alexander
+ Langer</span>
+ &lt;<a class="Mt" href="mailto:alex@FreeBSD.org">alex@FreeBSD.org</a>&gt;.</p>
+</section>
+</div>
+<table class="foot">
+ <tr>
+ <td class="foot-date">January 19, 2012</td>
+ <td class="foot-os">FreeBSD 15.0</td>
+ </tr>
+</table>