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<title>mdevd - A mdev-compatible Linux hotplug manager daemon</title>
<meta name="Description" content="mdevd - a mdev-compatible Linux hotplug manager daemon" />
<meta name="Keywords" content="mdevd mdev udevd udev Linux kernel hotplug event uevent administration root laurent bercot ska skarnet" />
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<p>
<a href="//skarnet.org/software/">Software</a><br />
<a href="//skarnet.org/">skarnet.org</a>
</p>
<h1> mdevd </h1>
<h2> What is it ? </h2>
<p>
mdevd is a small daemon managing kernel hotplug events, similarly to udevd.
</p>
<p>
It uses the same configuration file as
<a href="https://git.busybox.net/busybox/plain/docs/mdev.txt">mdev</a>,
which is a hotplug manager integrated in the
<a href="https://busybox.net/">Busybox</a> suite of tools.
However, mdev needs to be registered in
<tt>/proc/sys/kernel/hotplug</tt>, and the kernel forks
an instance of mdev for every event; by contrast, mdevd is a daemon
and does not fork.
</p>
<p>
The point of mdevd is to provide a drop-in replacement to mdev
that does not fork, so it can handle large influxes of events
at boot time without a performance drop. mdevd is designed to be
entirely compatible with advanced mdev usage such as
<a href="https://github.com/slashbeast/mdev-like-a-boss">mdev-like-a-boss</a>.
</p>
<hr />
<h2> Installation </h2>
<h3> Requirements </h3>
<ul>
<li> A Linux-based system with a standard C development environment.
The Linux kernel must be 2.6.10 or later. </li>
<li> GNU make, version 3.81 or later </li>
<li> <a href="//skarnet.org/software/skalibs/">skalibs</a> version
2.6.0.0 or later. It's a build-time requirement. It's also a run-time
requirement if you link against the shared version of the skalibs
library. </li>
</ul>
<h3> Licensing </h3>
<p>
mdevd is free software. It is available under the
<a href="http://opensource.org/licenses/ISC">ISC license</a>.
</p>
<h3> Download </h3>
<ul>
<li> The current released version of mdevd is
<a href="mdevd-0.0.1.0.tar.gz">0.0.1.0</a>. </li>
<li> Alternatively, you can checkout a copy of the
<a href="//git.skarnet.org/cgi-bin/cgit.cgi/mdevd/">mdevd
git repository</a>:
<pre> git clone git://git.skarnet.org/mdevd </pre> </li>
<li> There's also a
<a href="https://github.com/skarnet/mdevd">GitHub mirror</a>
of the mdevd git repository. </li>
</ul>
<h3> Compilation </h3>
<ul>
<li> See the enclosed INSTALL file for installation details. </li>
</ul>
<h3> Upgrade notes </h3>
<ul>
<li> <a href="upgrade.html">This page</a> lists the differences to be aware of between
the previous versions of mdevd and the current one. </li>
</ul>
<hr />
<h2> Reference </h2>
<h3> Commands </h3>
<ul>
<li><a href="mdevd.html">The <tt>mdevd</tt> program</a></li>
<li><a href="mdevd-netlink.html">The <tt>mdevd-netlink</tt> program</a></li>
<li><a href="mdevd-coldplug.html">The <tt>mdevd-coldplug</tt> program</a></li>
</ul>
<h2> Related resources </h2>
<ul>
<li> <tt>mdevd</tt> is discussed on the
<a href="//skarnet.org/lists.html#skaware">skaware</a> mailing-list. </li>
</ul>
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