projects / systemd.git / blame
| Commit | Line | Data |
|---|---|---|
| 663996b3 MS |
1 | <html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>systemd-halt.service</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><style> |
| 2 | a.headerlink { | |
| 3 | color: #c60f0f; | |
| 4 | font-size: 0.8em; | |
| 5 | padding: 0 4px 0 4px; | |
| 6 | text-decoration: none; | |
| 7 | visibility: hidden; | |
| 8 | } | |
| 9 | ||
| 10 | a.headerlink:hover { | |
| 11 | background-color: #c60f0f; | |
| 12 | color: white; | |
| 13 | } | |
| 14 | ||
| 15 | h1:hover > a.headerlink, h2:hover > a.headerlink, h3:hover > a.headerlink, dt:hover > a.headerlink { | |
| 16 | visibility: visible; | |
| 17 | } | |
| 18 | </style><a href="index.html">Index </a>· | |
| 19 | <a href="systemd.directives.html">Directives </a>· | |
| 20 | <a href="../python-systemd/index.html">Python </a>· | |
| 21 | <a href="../libudev/index.html">libudev </a>· | |
| 60f067b4 | 22 | <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 214</span><hr><div class="refentry"><a name="systemd-halt.service"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>systemd-halt.service, systemd-poweroff.service, systemd-reboot.service, systemd-kexec.service, systemd-shutdown — System shutdown logic</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">systemd-halt.service</code></p><p><code class="filename">systemd-poweroff.service</code></p><p><code class="filename">systemd-reboot.service</code></p><p><code class="filename">systemd-kexec.service</code></p><p><code class="filename">/usr/lib/systemd/systemd-shutdown</code></p></div><div class="refsect1"><a name="idm214170881184"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="filename">systemd-halt.service</code> is a |
| 663996b3 MS |
23 | system service that is pulled in by |
| 24 | <code class="filename">halt.target</code> and is responsible | |
| 60f067b4 | 25 | for the actual system halt. Similarly, |
| 663996b3 MS |
26 | <code class="filename">systemd-poweroff.service</code> is |
| 27 | pulled in by <code class="filename">poweroff.target</code>, | |
| 28 | <code class="filename">systemd-reboot.service</code> by | |
| 29 | <code class="filename">reboot.target</code> and | |
| 30 | <code class="filename">systemd-kexec.service</code> by | |
| 31 | <code class="filename">kexec.target</code> to execute the | |
| 60f067b4 | 32 | respective actions.</p><p>When these services are run, they ensure that PID |
| 663996b3 MS |
33 | 1 is replaced by the |
| 34 | <code class="filename">/usr/lib/systemd/systemd-shutdown</code> | |
| 35 | tool which is then responsible for the actual | |
| 60f067b4 | 36 | shutdown. Before shutting down, this binary will try to |
| 663996b3 MS |
37 | unmount all remaining file systems, disable all |
| 38 | remaining swap devices, detach all remaining storage | |
| 60f067b4 JS |
39 | devices and kill all remaining processes.</p><p>It is necessary to have this code in a separate binary |
| 40 | because otherwise rebooting after an upgrade might be broken — | |
| 41 | the running PID 1 could still depend on libraries which are not | |
| 42 | available any more, thus keeping the file system busy, which | |
| 43 | then cannot be re-mounted read-only.</p><p>Immediately before executing the actual system | |
| 663996b3 MS |
44 | halt/poweroff/reboot/kexec |
| 45 | <code class="filename">systemd-shutdown</code> will run all | |
| 46 | executables in | |
| 47 | <code class="filename">/usr/lib/systemd/system-shutdown/</code> | |
| 48 | and pass one arguments to them: either | |
| 49 | "<code class="literal">halt</code>", | |
| 50 | "<code class="literal">poweroff</code>", | |
| 51 | "<code class="literal">reboot</code>" or | |
| 52 | "<code class="literal">kexec</code>", depending on the chosen | |
| 53 | action. All executables in this directory are executed | |
| 54 | in parallel, and execution of the action is not | |
| 55 | continued before all executables finished.</p><p>Note that | |
| 56 | <code class="filename">systemd-halt.service</code> (and the | |
| 57 | related units) should never be executed | |
| 58 | directly. Instead, trigger system shutdown with a | |
| 59 | command such as "<code class="literal">systemctl halt</code>" or | |
| 60f067b4 | 60 | suchlike.</p></div><div class="refsect1"><a name="idm214167153872"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p> |
| 663996b3 MS |
61 | <a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>, |
| 62 | <a href="systemctl.html"><span class="citerefentry"><span class="refentrytitle">systemctl</span>(1)</span></a>, | |
| 63 | <a href="systemd.special.html"><span class="citerefentry"><span class="refentrytitle">systemd.special</span>(7)</span></a>, | |
| 64 | <a href="reboot.html"><span class="citerefentry"><span class="refentrytitle">reboot</span>(2)</span></a>, | |
| 65 | <a href="systemd-suspend.service.html"><span class="citerefentry"><span class="refentrytitle">systemd-suspend.service</span>(8)</span></a> | |
| 66 | </p></div></div></body></html> |