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
   9 <refentry id="sd_booted"
  10   xmlns:xi="http://www.w3.org/2001/XInclude">
  11
  12   <refentryinfo>
  13     <title>sd_booted</title>
  14     <productname>systemd</productname>
  15   </refentryinfo>
  16
  17   <refmeta>
  18     <refentrytitle>sd_booted</refentrytitle>
  19     <manvolnum>3</manvolnum>
  20   </refmeta>
  21
  22   <refnamediv>
  23     <refname>sd_booted</refname>
  24     <refpurpose>Test whether the system is running the systemd init system</refpurpose>
  25   </refnamediv>
  26
  27   <refsynopsisdiv>
  28     <funcsynopsis>
  29       <funcsynopsisinfo>#include &lt;systemd/sd-daemon.h&gt;</funcsynopsisinfo>
  30
  31       <funcprototype>
  32         <funcdef>int <function>sd_booted</function></funcdef>
  33         <paramdef>void</paramdef>
  34       </funcprototype>
  35     </funcsynopsis>
  36   </refsynopsisdiv>
  37
  38   <refsect1>
  39     <title>Description</title>
  40     <para><function>sd_booted()</function> checks whether the system
  41     was booted up using the systemd init system.</para>
  42   </refsect1>
  43
  44   <refsect1>
  45     <title>Return Value</title>
  46
  47     <para>On failure, this call returns a negative errno-style error
  48     code. If the system was booted up with systemd as init system,
  49     this call returns a positive return value, zero otherwise.</para>
  50   </refsect1>
  51
  52   <refsect1>
  53     <title>Notes</title>
  54
  55     <xi:include href="libelogind-pkgconfig.xml" xpointer="pkgconfig-text"/>
  56
  57     <para>Internally, this function checks whether the directory
  58     <filename>/run/systemd/system/</filename> exists. A simple check
  59     like this can also be implemented trivially in shell or any other
  60     language.</para>
  61   </refsect1>
  62
  63   <refsect1>
  64     <title>See Also</title>
  65     <para>
  66       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
  67       <citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>
  68     </para>
  69   </refsect1>
  70
  71 </refentry>