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dee0fccc | 1 | <?xml version='1.0'?> |
3a54a157 | 2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" |
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3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
4 | <!-- SPDX-License-Identifier: LGPL-2.1+ --> | |
5 | ||
6 | <refentry id="sd_bus_slot_set_description" xmlns:xi="http://www.w3.org/2001/XInclude"> | |
7 | <refentryinfo> | |
8 | <title>sd_bus_slot_set_description</title> | |
9 | <productname>systemd</productname> | |
10 | </refentryinfo> | |
11 | ||
12 | <refmeta> | |
13 | <refentrytitle>sd_bus_slot_set_description</refentrytitle> | |
14 | <manvolnum>3</manvolnum> | |
15 | </refmeta> | |
16 | ||
17 | <refnamediv> | |
18 | <refname>sd_bus_slot_set_description</refname> | |
19 | <refname>sd_bus_slot_get_description</refname> | |
20 | ||
21 | <refpurpose>Set or query the description of bus slot objects</refpurpose> | |
22 | </refnamediv> | |
23 | ||
24 | <refsynopsisdiv> | |
25 | <funcsynopsis> | |
26 | <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo> | |
27 | ||
28 | <funcprototype> | |
29 | <funcdef>int <function>sd_bus_slot_set_description</function></funcdef> | |
30 | <paramdef>sd_bus_slot* <parameter>slot</parameter></paramdef> | |
31 | <paramdef>const char *<parameter>description</parameter></paramdef> | |
32 | </funcprototype> | |
33 | ||
34 | <funcprototype> | |
35 | <funcdef>int <function>sd_bus_slot_get_description</function></funcdef> | |
36 | <paramdef>sd_bus_slot* <parameter>bus</parameter></paramdef> | |
37 | <paramdef>const char **<parameter>description</parameter></paramdef> | |
38 | </funcprototype> | |
39 | </funcsynopsis> | |
40 | </refsynopsisdiv> | |
41 | ||
42 | <refsect1> | |
43 | <title>Description</title> | |
44 | ||
45 | <para><function>sd_bus_slot_set_description()</function> sets the description string | |
46 | that is used in logging to the specified string. The string is copied internally | |
47 | and freed when the bus slot object is deallocated. The | |
48 | <parameter>description</parameter> argument may be <constant>NULL</constant>, in | |
49 | which case the description is unset.</para> | |
50 | ||
51 | <para><function>sd_bus_slot_get_description()</function> returns a description string in | |
52 | <parameter>description</parameter>. If the string is not set, e.g. with | |
53 | <function>sd_bus_slot_set_description()</function>, and the slot is a bus match callback slot, | |
54 | the match string will be returned. Otherwise, <constant>-ENXIO</constant> is returned. | |
55 | </para> | |
56 | </refsect1> | |
57 | ||
58 | <refsect1> | |
59 | <title>Return Value</title> | |
60 | ||
61 | <para>On success, these functions return 0 or a positive integer. On failure, | |
62 | they return a negative errno-style error code.</para> | |
dee0fccc | 63 | |
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64 | <refsect2> |
65 | <title>Errors</title> | |
dee0fccc | 66 | |
b1de39de | 67 | <para>Returned errors may indicate the following problems:</para> |
dee0fccc | 68 | |
b1de39de ZJS |
69 | <variablelist> |
70 | <varlistentry> | |
71 | <term><constant>-EINVAL</constant></term> | |
dee0fccc | 72 | |
b1de39de ZJS |
73 | <listitem><para>An required argument is <constant>NULL</constant>.</para></listitem> |
74 | </varlistentry> | |
dee0fccc | 75 | |
b1de39de ZJS |
76 | <varlistentry> |
77 | <term><constant>-ENXIO</constant></term> | |
dee0fccc | 78 | |
b1de39de ZJS |
79 | <listitem><para>The bus slot object has no description.</para></listitem> |
80 | </varlistentry> | |
dee0fccc | 81 | |
b1de39de ZJS |
82 | <varlistentry> |
83 | <term><constant>-ENOMEM</constant></term> | |
dee0fccc | 84 | |
b1de39de ZJS |
85 | <listitem><para>Memory allocation failed.</para></listitem> |
86 | </varlistentry> | |
87 | </variablelist> | |
dee0fccc | 88 | |
b1de39de | 89 | </refsect2> |
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90 | </refsect1> |
91 | ||
92 | <xi:include href="libsystemd-pkgconfig.xml" /> | |
93 | ||
94 | <refsect1> | |
95 | <title>See Also</title> | |
96 | ||
97 | <para> | |
98 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
99 | <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
100 | <citerefentry><refentrytitle>sd_bus_slot_ref</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
101 | <citerefentry><refentrytitle>sd_bus_slot_set_userdata</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
102 | </para> | |
103 | </refsect1> | |
104 | ||
105 | </refentry> |