man/sd_booted.xml

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