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+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="sd_bus_slot_ref" xmlns:xi="http://www.w3.org/2001/XInclude">
+ <refentryinfo>
+ <title>sd_bus_slot_ref</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_bus_slot_ref</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_bus_slot_ref</refname>
+ <refname>sd_bus_slot_unref</refname>
+ <refname>sd_bus_slot_unrefp</refname>
+
+ <refpurpose>Create and destroy references to a bus slot object</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>sd_bus_slot *<function>sd_bus_slot_ref</function></funcdef>
+ <paramdef>sd_bus_slot *<parameter>slot</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>sd_bus_slot *<function>sd_bus_slot_unref</function></funcdef>
+ <paramdef>sd_bus_slot *<parameter>slot</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>void <function>sd_bus_slot_unrefp</function></funcdef>
+ <paramdef>sd_bus_slot **<parameter>slotp</parameter></paramdef>
+ </funcprototype>
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><function>sd_bus_slot_ref()</function> increases the internal reference counter of
+ <parameter>slot</parameter> by one.</para>
+
+ <para><function>sd_bus_slot_unref()</function> decreases the internal reference counter of
+ <parameter>slot</parameter> by one. Once the reference count has dropped to zero, slot object is
+ destroyed and cannot be used anymore, so further calls to <function>sd_bus_slot_ref()</function>
+ or <function>sd_bus_slot_unref()</function> are illegal.</para>
+
+ <para><function>sd_bus_slot_unrefp()</function> is similar to
+ <function>sd_bus_slot_unref()</function> but takes a pointer to a pointer to an
+ <type>sd_bus_slot</type> object. This call is useful in conjunction with GCC's and LLVM's <ulink
+ url="https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html">Clean-up Variable
+ Attribute</ulink>. See
+ <citerefentry><refentrytitle>sd_bus_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ for an example how to use the cleanup attribute.</para>
+
+ <para><function>sd_bus_slot_ref()</function> and <function>sd_bus_slot_unref()</function>
+ execute no operation if the passed in bus object address is
+ <constant>NULL</constant>. <function>sd_bus_slot_unrefp()</function> will first dereference
+ its argument, which must not be <constant>NULL</constant>, and will execute no operation if
+ <emphasis>that</emphasis> is <constant>NULL</constant>.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para><function>sd_bus_slot_ref()</function> always returns the argument.</para>
+
+ <para><function>sd_bus_slot_unref()</function> always returns <constant>NULL</constant>.</para>
+ </refsect1>
+
+ <xi:include href="libsystemd-pkgconfig.xml" />
+
+ <refsect1>
+ <title>See Also</title>
+
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_bus_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_bus_message_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_bus_call_method_async</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>