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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_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>