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<title>mdevd: the mdevd-coldplug program</title>
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<a href="index.html">mdevd</a><br />
<a href="//skarnet.org/software/">Software</a><br />
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<h1> The <tt>mdevd-coldplug</tt> program </h1>
<p>
<tt>mdevd-coldplug</tt> performs a <em>coldplug</em>: it scans
<tt>/sys</tt> for all registered devices an uevent manager would
want to perform actions on, and generates uevents for all these
devices.
</p>
<h2> Interface </h2>
<pre>
mdevd-coldplug [ -s <em>slashsys</em> ]
</pre>
<ul>
<li> mdevd-coldplug scans <tt>/sys</tt> for devices. </li>
<li> For every suitable device it finds, it generates an
uevent and writes it to its stdout, using the same format
as <a href="mdevd-netlink.html">mdevd-netlink</a>. </li>
<li> It exits when it has finished scanning. </li>
</ul>
<p>
This implies that the <tt>mdevd-coldplug | mdevd</tt> command line
will function as a coldplug manager, just like <tt>mdev -s</tt>.
</p>
<h2> Options </h2>
<ul>
<li> <tt>-s</tt> <em>slashsys</em> : assume the sysfs
pseudo-filesystem is mounted on <em>slashsys</em>. Default is <tt>/sys</tt>. </li>
</ul>
<h2> Exit codes </h2>
<ul>
<li> 0: success </li>
<li> 111: system call failed </li>
</ul>
<h2> Notes </h2>
<ul>
<li> mdevd-coldplug is a short-lived program, just like
<tt>mdev -s</tt>. </li>
<li> Unlike <tt>mdev -s</tt>, however, mdevd-coldplug does
not act on the uevents it generates. It simply prints them.
This allows for easy debugging. </li>
<li> To act on the uevents, simply pipe the output of
<tt>mdevd-coldplug</tt> into <a href="mdevd.html">mdevd</a>. </li>
</ul>
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