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| e735f4d4 | 22 | <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 219</span><hr><div class="refentry"><a name="systemd-udevd.service"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>systemd-udevd.service, systemd-udevd-control.socket, systemd-udevd-kernel.socket, systemd-udevd — Device event managing daemon</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">systemd-udevd.service</code></p><p><code class="filename">systemd-udevd-control.socket</code></p><p><code class="filename">systemd-udevd-kernel.socket</code></p><div class="cmdsynopsis"><p><code class="command">/usr/lib/systemd/systemd-udevd</code> [<code class="option">--daemon</code>] [<code class="option">--debug</code>] [<code class="option">--children-max=</code>] [<code class="option">--exec-delay=</code>] [<code class="option">--event-timeout=</code>] [<code class="option">--resolve-names=early|late|never</code>] [<code class="option">--version</code>] [<code class="option">--help</code>]</p></div></div><div class="refsect1"><a name="idm140413858842720"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><span class="command"><strong>systemd-udevd</strong></span> listens to kernel uevents. |
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23 | For every event, systemd-udevd executes matching instructions |
| 24 | specified in udev rules. See <a href="udev.html"><span class="citerefentry"><span class="refentrytitle">udev</span>(7)</span></a>.</p><p>The behavior of the daemon can be configured using | |
| 25 | <a href="udev.conf.html"><span class="citerefentry"><span class="refentrytitle">udev.conf</span>(5)</span></a>, | |
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26 | its command line options, environment variables, and on the kernel |
| 27 | command line, or changed dynamically with <span class="command"><strong>udevadm | |
| 5eef597e | 28 | control</strong></span>. |
| e735f4d4 | 29 | </p></div><div class="refsect1"><a name="idm140413858837824"></a><h2 id="Options">Options<a class="headerlink" title="Permalink to this headline" href="#Options">¶</a></h2><div class="variablelist"><dl class="variablelist"><dt id="--daemon"><span class="term"><code class="option">--daemon</code></span><a class="headerlink" title="Permalink to this term" href="#--daemon">¶</a></dt><dd><p>Detach and run in the background.</p></dd><dt id="--debug"><span class="term"><code class="option">--debug</code></span><a class="headerlink" title="Permalink to this term" href="#--debug">¶</a></dt><dd><p>Print debug messages to standard error.</p></dd><dt id="--children-max="><span class="term"><code class="option">--children-max=</code></span><a class="headerlink" title="Permalink to this term" href="#--children-max=">¶</a></dt><dd><p>Limit the number of events executed in parallel.</p></dd><dt id="--exec-delay="><span class="term"><code class="option">--exec-delay=</code></span><a class="headerlink" title="Permalink to this term" href="#--exec-delay=">¶</a></dt><dd><p>Delay the execution of <code class="varname">RUN</code> |
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30 | instructions by the given number of seconds. This option |
| 31 | might be useful when debugging system crashes during | |
| 32 | coldplug caused by loading non-working kernel | |
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33 | modules.</p></dd><dt id="--event-timeout="><span class="term"><code class="option">--event-timeout=</code></span><a class="headerlink" title="Permalink to this term" href="#--event-timeout=">¶</a></dt><dd><p>Set the number of seconds to wait for events to finish. After |
| 34 | this time the event will be terminated. The default is 30 seconds.</p></dd><dt id="--resolve-names="><span class="term"><code class="option">--resolve-names=</code></span><a class="headerlink" title="Permalink to this term" href="#--resolve-names=">¶</a></dt><dd><p>Specify when systemd-udevd should resolve names of users and groups. | |
| 60f067b4 | 35 | When set to <code class="option">early</code> (the default), names will be |
| 663996b3 | 36 | resolved when the rules are parsed. When set to |
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37 | <code class="option">late</code>, names will be resolved for every event. |
| 38 | When set to <code class="option">never</code>, names will never be resolved | |
| 39 | and all devices will be owned by root.</p></dd><dt id="--help"><span class="term"><code class="option">--help</code></span><a class="headerlink" title="Permalink to this term" href="#--help">¶</a></dt><dd><p><a name="help-text"></a>Print a short help text and exit. | |
| e735f4d4 | 40 | </p></dd><dt id="--version"><span class="term"><code class="option">--version</code></span><a class="headerlink" title="Permalink to this term" href="#--version">¶</a></dt><dd><p><a name="version-text"></a>Print a short version string and exit.</p></dd></dl></div></div><div class="refsect1"><a name="idm140413862538864"></a><h2 id="Kernel command line">Kernel command line<a class="headerlink" title="Permalink to this headline" href="#Kernel%20command%20line">¶</a></h2><div class="variablelist"><p>Parameters starting with "rd." will be read when |
| f47781d8 | 41 | <span class="command"><strong>systemd-udevd</strong></span> is used in an initrd.</p><dl class="variablelist"><dt id="udev.log-priority="><span class="term"><code class="varname">udev.log-priority=</code>, </span><span class="term"><code class="varname">rd.udev.log-priority=</code></span><a class="headerlink" title="Permalink to this term" href="#udev.log-priority=">¶</a></dt><dd><p>Set the log level.</p></dd><dt id="udev.children-max="><span class="term"><code class="varname">udev.children-max=</code>, </span><span class="term"><code class="varname">rd.udev.children-max=</code></span><a class="headerlink" title="Permalink to this term" href="#udev.children-max=">¶</a></dt><dd><p>Limit the number of events executed in parallel.</p></dd><dt id="udev.exec-delay="><span class="term"><code class="varname">udev.exec-delay=</code>, </span><span class="term"><code class="varname">rd.udev.exec-delay=</code></span><a class="headerlink" title="Permalink to this term" href="#udev.exec-delay=">¶</a></dt><dd><p>Delay the execution of <code class="varname">RUN</code> instructions by the given |
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42 | number of seconds. This option might be useful when |
| 43 | debugging system crashes during coldplug caused by loading | |
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44 | non-working kernel modules.</p></dd><dt id="udev.event-timeout="><span class="term"><code class="varname">udev.event-timeout=</code>, </span><span class="term"><code class="varname">rd.udev.event-timeout=</code></span><a class="headerlink" title="Permalink to this term" href="#udev.event-timeout=">¶</a></dt><dd><p>Wait for events to finish up to the given number |
| 45 | of seconds. This option might be useful if events are | |
| 46 | terminated due to kernel drivers taking too long to initialize.</p></dd><dt id="net.ifnames="><span class="term"><code class="varname">net.ifnames=</code></span><a class="headerlink" title="Permalink to this term" href="#net.ifnames=">¶</a></dt><dd><p>Network interfaces are renamed to give them predictable names | |
| e735f4d4 | 47 | when possible. It is enabled by default; specifying 0 disables it.</p></dd></dl></div></div><div class="refsect1"><a name="idm140413862516928"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p> |
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48 | <a href="udev.conf.html"><span class="citerefentry"><span class="refentrytitle">udev.conf</span>(5)</span></a>, |
| 49 | <a href="udev.html"><span class="citerefentry"><span class="refentrytitle">udev</span>(7)</span></a>, | |
| 50 | <a href="udevadm.html"><span class="citerefentry"><span class="refentrytitle">udevadm</span>(8)</span></a> | |
| 51 | </p></div></div></body></html> |