man/sd_booted.xml

   1 <?xml version='1.0'?> <!--*-nxml-*-->
   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
   3   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
   4
   5 <!--
   6   SPDX-License-Identifier: LGPL-2.1+
   7
   8   Copyright 2010 Lennart Poettering
   9 -->
  10
  11 <refentry id="sd_booted"
  12   xmlns:xi="http://www.w3.org/2001/XInclude">
  13
  14   <refentryinfo>
  15     <title>sd_booted</title>
  16     <productname>systemd</productname>
  17
  18     <authorgroup>
  19       <author>
  20         <contrib>Developer</contrib>
  21         <firstname>Lennart</firstname>
  22         <surname>Poettering</surname>
  23         <email>lennart@poettering.net</email>
  24       </author>
  25     </authorgroup>
  26   </refentryinfo>
  27
  28   <refmeta>
  29     <refentrytitle>sd_booted</refentrytitle>
  30     <manvolnum>3</manvolnum>
  31   </refmeta>
  32
  33   <refnamediv>
  34     <refname>sd_booted</refname>
  35     <refpurpose>Test whether the system is running the systemd init system</refpurpose>
  36   </refnamediv>
  37
  38   <refsynopsisdiv>
  39     <funcsynopsis>
  40       <funcsynopsisinfo>#include &lt;systemd/sd-daemon.h&gt;</funcsynopsisinfo>
  41
  42       <funcprototype>
  43         <funcdef>int <function>sd_booted</function></funcdef>
  44         <paramdef>void</paramdef>
  45       </funcprototype>
  46     </funcsynopsis>
  47   </refsynopsisdiv>
  48
  49   <refsect1>
  50     <title>Description</title>
  51     <para><function>sd_booted()</function> checks whether the system
  52     was booted up using the systemd init system.</para>
  53   </refsect1>
  54
  55   <refsect1>
  56     <title>Return Value</title>
  57
  58     <para>On failure, this call returns a negative errno-style error
  59     code. If the system was booted up with systemd as init system,
  60     this call returns a positive return value, zero otherwise.</para>
  61   </refsect1>
  62
  63   <refsect1>
  64     <title>Notes</title>
  65
  66     <xi:include href="libelogind-pkgconfig.xml" xpointer="pkgconfig-text"/>
  67
  68     <para>Internally, this function checks whether the directory
  69     <filename>/run/systemd/system/</filename> exists. A simple check
  70     like this can also be implemented trivially in shell or any other
  71     language.</para>
  72   </refsect1>
  73
  74   <refsect1>
  75     <title>See Also</title>
  76     <para>
  77       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  78       <citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>
  79     </para>
  80   </refsect1>
  81
  82 </refentry>