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man/sd_booted.html
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  <a href="systemd.directives.html">Directives </a>·
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  <a href="../python-systemd/index.html">Python </a>·
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  <a href="../libudev/index.html">libudev </a>·
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  <a href="../libudev/index.html">gudev </a><hr><div class="refentry"><a name="sd_booted"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sd_booted — Test whether the system is running the systemd init system</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include &lt;systemd/sd-daemon.h&gt;</pre><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_booted</b>(</code></td><td>void<code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idp3967296"></a><h2>Description</h2><p><code class="function">sd_booted()</code> checks whether
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                the system was booted up using the systemd init system.</p></div><div class="refsect1"><a name="idp3969040"></a><h2>Return Value</h2><p>On failure, this call returns a negative
 
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  <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 202</span><hr><div class="refentry"><a name="sd_booted"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sd_booted — Test whether the system is running the systemd init system</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><pre class="funcsynopsisinfo">#include &lt;systemd/sd-daemon.h&gt;</pre><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">sd_booted</b>(</code></td><td>void<code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a name="idp194000"></a><h2>Description</h2><p><code class="function">sd_booted()</code> checks whether
 
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                the system was booted up using the systemd init system.</p></div><div class="refsect1"><a name="idp196672"></a><h2>Return Value</h2><p>On failure, this call returns a negative
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                errno-style error code. If the system was booted up
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                with systemd as init system, this call returns a
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                positive return value, zero otherwise.</p></div><div class="refsect1"><a name="idp3970464"></a><h2>Notes</h2><p>This function is provided by the reference
 
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                positive return value, zero otherwise.</p></div><div class="refsect1"><a name="idp124960"></a><h2>Notes</h2><p>This function is provided by the reference
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                implementation of APIs for new-style daemons and
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                distributed with the systemd package. The algorithm it
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                implements is simple, and can easily be reimplemented
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                in daemons if it is important to support this
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                interface without using the reference
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                implementation.</p><p>Internally, this function checks whether the
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                <code class="filename">/sys/fs/cgroup/systemd</code> virtual file
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                system is mounted, by comparing the st_dev value of
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                the <code class="function">stat()</code> data of
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                <code class="filename">/sys/fs/cgroup</code> and
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                <code class="filename">/sys/fs/cgroup/systemd</code>.</p><p>For details about the algorithm check the
 
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                directory <code class="filename">/run/systemd/system/</code>
 
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                exists. A simple check like this can also be
 
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                implemented trivially in shell or any other
 
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                language.</p><p>For details about the algorithm check the
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                liberally licensed reference implementation sources:
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                <a class="ulink" href="http://cgit.freedesktop.org/systemd/systemd/plain/src/libsystemd-daemon/sd-daemon.c" target="_top">http://cgit.freedesktop.org/systemd/systemd/plain/src/libsystemd-daemon/sd-daemon.c</a>
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                and <a class="ulink" href="http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-daemon.h" target="_top">http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-daemon.h</a></p><p><code class="function">sd_booted()</code> is implemented
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                <a href="sd-daemon.html"><span class="citerefentry"><span class="refentrytitle">sd-daemon</span>(3)</span></a>.</p><p>If the reference implementation is used as
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                drop-in files and -DDISABLE_SYSTEMD is set during
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                compilation this function will always return 0 and
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                otherwise become a NOP.</p></div><div class="refsect1"><a name="idp26128"></a><h2>See Also</h2><p>
 
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                otherwise become a NOP.</p></div><div class="refsect1"><a name="idp3971152"></a><h2>See Also</h2><p>
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                        <a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
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                        <a href="sd-daemon.html"><span class="citerefentry"><span class="refentrytitle">sd-daemon</span>(3)</span></a>
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                </p></div></div></body></html>