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<?xml version='1.0'?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1+ -->
<refentry id="sd_bus_slot_set_description" xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>sd_bus_slot_set_description</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>sd_bus_slot_set_description</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>sd_bus_slot_set_description</refname>
<refname>sd_bus_slot_get_description</refname>
<refpurpose>Set or query the description of bus slot objects</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
<funcprototype>
<funcdef>int <function>sd_bus_slot_set_description</function></funcdef>
<paramdef>sd_bus_slot* <parameter>slot</parameter></paramdef>
<paramdef>const char *<parameter>description</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>int <function>sd_bus_slot_get_description</function></funcdef>
<paramdef>sd_bus_slot* <parameter>bus</parameter></paramdef>
<paramdef>const char **<parameter>description</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><function>sd_bus_slot_set_description()</function> sets the description string
that is used in logging to the specified string. The string is copied internally
and freed when the bus slot object is deallocated. The
<parameter>description</parameter> argument may be <constant>NULL</constant>, in
which case the description is unset.</para>
<para><function>sd_bus_slot_get_description()</function> returns a description string in
<parameter>description</parameter>. If the string is not set, e.g. with
<function>sd_bus_slot_set_description()</function>, and the slot is a bus match callback slot,
the match string will be returned. Otherwise, <constant>-ENXIO</constant> is returned.
</para>
</refsect1>
<refsect1>
<title>Return Value</title>
<para>On success, these functions return 0 or a positive integer. On failure,
they return a negative errno-style error code.</para>
</refsect1>
<refsect1>
<title>Errors</title>
<para>Returned errors may indicate the following problems:</para>
<variablelist>
<varlistentry>
<term><constant>-EINVAL</constant></term>
<listitem><para>An required argument is <constant>NULL</constant>.</para></listitem>
</varlistentry>
</variablelist>
<variablelist>
<varlistentry>
<term><constant>-ENXIO</constant></term>
<listitem><para>The bus slot object has no description.</para></listitem>
</varlistentry>
</variablelist>
<variablelist>
<varlistentry>
<term><constant>-ENOMEM</constant></term>
<listitem><para>Memory allocation failed.</para></listitem>
</varlistentry>
</variablelist>
</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_slot_ref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_bus_slot_set_userdata</refentrytitle><manvolnum>3</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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