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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 a uevent manager would
want to perform actions on, and tells the kernel to generate uevents
for all these devices.
</p>
<h2> Interface </h2>
<pre>
mdevd-coldplug [ -v <em>verbosity</em> ] [ -s <em>slashsys</em> ] [ -O <em>nlgroup</em> ] [ -b <em>kbufsize</em> ]
</pre>
<ul>
<li> mdevd-coldplug scans <tt>/sys</tt> for devices. </li>
<li> For every suitable device it finds, it tells the kernel
to generate an event. If a device manager such as
as <a href="mdevd.html">mdevd</a> is listening to the netlink
at this point, it will pick up the series of events. </li>
<li> mdevd-coldplug exits when it has finished scanning. </li>
</ul>
<h2> Options </h2>
<ul>
<li> <tt>-v</tt> <em>verbosity</em> : be more or less verbose.
Default verbosity is 1. 0 will only print fatal error messages, 3 or more
is seriously verbose debugging. </li>
<li> <tt>-s</tt> <em>slashsys</em> : assume the sysfs
pseudo-filesystem is mounted on <em>slashsys</em>. Default is <tt>/sys</tt>. </li>
<li> <tt>-O</tt> <em>nlgroup</em> : synchronous coldplug.
<tt>mdevd-coldplug</tt> will not exit until the last uevent it triggers
has been handled by <a href="mdevd.html">mdevd</a>. <em>nlgroup</em>
needs to be a netlink group that <a href="mdevd.html">mdevd</a> is
rebroadcasting handled events to. Note that this option can only work
if <a href="mdevd.html">mdevd</a> is running with a similar <tt>-O</tt>
option with a compatible value; else, <tt>mdevd-coldplug</tt> will wait
forever. </li>
<li> <tt>-b</tt> <em>kbufsz</em> : try and reserve a kernel buffer of
<em>kbufsz</em> bytes for the netlink queue. The default is 500 kB;
if you're getting "No buffer space available" errors, try increasing this number.
This option is only meaningful when paired with the <tt>-O</tt> option. </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> or <tt>udevadm trigger</tt>. </li>
</ul>
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