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+<?xml version='1.0'?> <!--*-nxml-*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="sd_booted">
+
+ <refentryinfo>
+ <title>sd_booted</title>
+ <productname>systemd</productname>
+
+ <authorgroup>
+ <author>
+ <contrib>Developer</contrib>
+ <firstname>Lennart</firstname>
+ <surname>Poettering</surname>
+ <email>lennart@poettering.net</email>
+ </author>
+ </authorgroup>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_booted</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_booted</refname>
+ <refpurpose>Test whether the system is running the systemd init system</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include &lt;systemd/sd-daemon.h&gt;</funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>int <function>sd_booted</function></funcdef>
+ <paramdef>void</paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+ <para><function>sd_booted()</function> checks whether
+ the system was booted up using the systemd init system.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para>On failure, this call returns a negative
+ errno-style error code. If the system was booted up
+ with systemd as init system, this call returns a
+ positive return value, zero otherwise.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Notes</title>
+
+ <para>This function is provided by the reference
+ implementation of APIs for new-style daemons and
+ distributed with the systemd package. The algorithm it
+ implements is simple, and can easily be reimplemented
+ in daemons if it is important to support this
+ interface without using the reference
+ implementation.</para>
+
+ <para>Internally, this function checks whether the
+ <filename>/sys/fs/cgroup/systemd</filename> virtual file
+ system is mounted, by comparing the st_dev value of
+ the <function>stat()</function> data of
+ <filename>/sys/fs/cgroup</filename> and
+ <filename>/sys/fs/cgroup/systemd</filename>.</para>
+
+ <para>For details about the algorithm check the
+ liberally licensed reference implementation sources:
+ <ulink url="http://cgit.freedesktop.org/systemd/systemd/plain/src/libsystemd-daemon/sd-daemon.c"/>
+ and <ulink
+ url="http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-daemon.h"/></para>
+
+ <para><function>sd_booted()</function> is implemented
+ in the reference implementation's
+ <filename>sd-daemon.c</filename> and
+ <filename>sd-daemon.h</filename> files. These
+ interfaces are available as shared library, which can
+ be compiled and linked to with the
+ <literal>libsystemd-daemon</literal>
+ <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ file. Alternatively, applications consuming these APIs
+ may copy the implementation into their source
+ tree. For more details about the reference
+ implementation see
+ <citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
+
+ <para>If the reference implementation is used as
+ drop-in files and -DDISABLE_SYSTEMD is set during
+ compilation this function will always return 0 and
+ otherwise become a NOP.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>