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112 lines
3.8 KiB
XML
112 lines
3.8 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="sd_bus_slot_set_description" xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>sd_bus_slot_set_description</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_bus_slot_set_description</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_bus_slot_set_description</refname>
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<refname>sd_bus_slot_get_description</refname>
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<refpurpose>Set or query the description of bus slot objects</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_bus_slot_set_description</function></funcdef>
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<paramdef>sd_bus_slot* <parameter>slot</parameter></paramdef>
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<paramdef>const char *<parameter>description</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_bus_slot_get_description</function></funcdef>
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<paramdef>sd_bus_slot* <parameter>bus</parameter></paramdef>
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<paramdef>const char **<parameter>description</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_bus_slot_set_description()</function> sets the description string
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that is used in logging to the specified string. The string is copied internally
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and freed when the bus slot object is deallocated. The
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<parameter>description</parameter> argument may be <constant>NULL</constant>, in
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which case the description is unset.</para>
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<para><function>sd_bus_slot_get_description()</function> returns a description string in
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<parameter>description</parameter>. If the string is not set, e.g. with
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<function>sd_bus_slot_set_description()</function>, and the slot is a bus match callback slot,
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the match string will be returned. Otherwise, <constant>-ENXIO</constant> is returned.
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</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para>On success, these functions return 0 or a positive integer. On failure,
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they return a negative errno-style error code.</para>
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<refsect2>
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<title>Errors</title>
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<para>Returned errors may indicate the following problems:</para>
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<variablelist>
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<varlistentry>
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<term><constant>-EINVAL</constant></term>
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<listitem><para>An required argument is <constant>NULL</constant>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENXIO</constant></term>
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<listitem><para>The bus slot object has no description.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>-ENOMEM</constant></term>
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<listitem><para>Memory allocation failed.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect2>
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</refsect1>
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<xi:include href="libsystemd-pkgconfig.xml" />
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<refsect1>
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<title>History</title>
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<para><function>sd_bus_slot_set_description()</function> and
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<function>sd_bus_slot_get_description()</function> were added in version 240.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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<citerefentry><refentrytitle>sd_bus_slot_ref</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_bus_slot_set_userdata</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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