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<?xml version='1.0'?> <!-- * - nxml - * -->
< !DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<!-- 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 < systemd/sd-bus.h>
#include < systemd/sd-bus-vtable.h>
#include < systemd/sd-bus-protocol.h>
#include < systemd/sd-daemon.h>
#include < systemd/sd-device.h>
#include < systemd/sd-event.h>
#include < systemd/sd-gpt.h>
#include < systemd/sd-hwdb.h>
#include < systemd/sd-id128.h>
#include < systemd/sd-journal.h>
#include < systemd/sd-login.h>
#include < systemd/sd-messages.h>
#include < systemd/sd-path.h>
</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>
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<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>
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</refsect1>
</refentry>