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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->

<refentry id="libsystemd"
  xmlns:xi="http://www.w3.org/2001/XInclude">

  <refentryinfo>
    <title>libsystemd</title>
    <productname>systemd</productname>
  </refentryinfo>

  <refmeta>
    <refentrytitle>libsystemd</refentrytitle>
    <manvolnum>3</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>libsystemd</refname>
    <refpurpose>Functions for implementing services and interacting with systemd</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <programlisting>
#include &lt;systemd/sd-bus.h&gt;
#include &lt;systemd/sd-bus-vtable.h&gt;
#include &lt;systemd/sd-bus-protocol.h&gt;
#include &lt;systemd/sd-daemon.h&gt;
#include &lt;systemd/sd-device.h&gt;
#include &lt;systemd/sd-event.h&gt;
#include &lt;systemd/sd-gpt.h&gt;
#include &lt;systemd/sd-hwdb.h&gt;
#include &lt;systemd/sd-id128.h&gt;
#include &lt;systemd/sd-journal.h&gt;
#include &lt;systemd/sd-login.h&gt;
#include &lt;systemd/sd-messages.h&gt;
#include &lt;systemd/sd-path.h&gt;
    </programlisting>

    <cmdsynopsis>
      <command>pkg-config --cflags --libs libsystemd</command>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para>The <filename>libsystemd</filename> library provides functions that allow interacting with various
    interfaces provided by the
    <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry> service
    manager, as well as various other functions and constants useful for implementing services in
    general.</para>

    <para>See
    <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
    <citerefentry><refentrytitle>sd-bus-errors</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
    <citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
    <citerefentry><refentrytitle>sd-device</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
    <citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
    <citerefentry><refentrytitle>sd-hwdb</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
    <citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
    <citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
    and
    <citerefentry><refentrytitle>sd-login</refentrytitle><manvolnum>3</manvolnum></citerefentry>
    for information about different parts of the library interface.</para>
  </refsect1>

  <refsect1>
    <title>Interface stability</title>

    <para>Strict backwards-compatibility is maintained for the API (application programming interface) and
    ABI (application binary interface). Symbol versioning is used, with symbols only added and never removed.
    </para>
  </refsect1>

  <xi:include href="libsystemd-pkgconfig.xml" />

  <refsect1>
    <title>See Also</title>
    <para><simplelist type="inline">
      <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
      <member><citerefentry><refentrytitle>libudev</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
      <member><citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
      <member><ulink url="https://systemd.io/PORTABILITY_AND_STABILITY/">Interface Portability and Stability Promise</ulink></member>
    </simplelist></para>
  </refsect1>

</refentry>