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1 | <?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*--> |
2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" | |
3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> | |
4 | ||
5 | <!-- | |
572eb058 ZJS |
6 | SPDX-License-Identifier: LGPL-2.1+ |
7 | ||
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8 | This file is part of systemd. |
9 | ||
10 | Copyright 2015 Lennart Poettering | |
11 | ||
12 | systemd is free software; you can redistribute it and/or modify it | |
13 | under the terms of the GNU Lesser General Public License as published by | |
14 | the Free Software Foundation; either version 2.1 of the License, or | |
15 | (at your option) any later version. | |
16 | ||
17 | systemd is distributed in the hope that it will be useful, but | |
18 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
20 | Lesser General Public License for more details. | |
21 | ||
22 | You should have received a copy of the GNU Lesser General Public License | |
23 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
24 | --> | |
25 | ||
26 | <refentry id="sd_bus_error_add_map"> | |
27 | ||
28 | <refentryinfo> | |
29 | <title>sd_bus_error_add_map</title> | |
30 | <productname>systemd</productname> | |
31 | ||
32 | <authorgroup> | |
33 | <author> | |
34 | <contrib>Developer</contrib> | |
35 | <firstname>Lennart</firstname> | |
36 | <surname>Poettering</surname> | |
37 | <email>lennart@poettering.net</email> | |
38 | </author> | |
39 | </authorgroup> | |
40 | </refentryinfo> | |
41 | ||
42 | <refmeta> | |
43 | <refentrytitle>sd_bus_error_add_map</refentrytitle> | |
44 | <manvolnum>3</manvolnum> | |
45 | </refmeta> | |
46 | ||
47 | <refnamediv> | |
48 | <refname>sd_bus_error_add_map</refname> | |
49 | <refname>sd_bus_error_map</refname> | |
50 | <refname>SD_BUS_ERROR_MAP</refname> | |
51 | <refname>SD_BUS_ERROR_END</refname> | |
52 | ||
53 | <refpurpose>Additional sd-dbus error mappings</refpurpose> | |
54 | </refnamediv> | |
55 | ||
56 | <refsynopsisdiv> | |
57 | <funcsynopsis> | |
58 | <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo> | |
59 | ||
60 | <funcsynopsisinfo>typedef struct { | |
61 | const char *name; | |
62 | int code; | |
1eecafb8 | 63 | … |
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64 | } sd_bus_error_map;</funcsynopsisinfo> |
65 | ||
66 | </funcsynopsis> | |
67 | ||
68 | <para> | |
69 | <constant>SD_BUS_ERROR_MAP(<replaceable>name</replaceable>, <replaceable>code</replaceable>)</constant> | |
70 | </para> | |
71 | <para> | |
72 | <constant>SD_BUS_ERROR_MAP_END</constant> | |
73 | </para> | |
74 | ||
75 | <funcprototype> | |
76 | <funcdef>int <function>sd_bus_error_add_map</function></funcdef> | |
77 | <paramdef>const sd_bus_map *<parameter>map</parameter></paramdef> | |
78 | </funcprototype> | |
79 | ||
80 | </refsynopsisdiv> | |
81 | ||
82 | <refsect1> | |
83 | <title>Description</title> | |
84 | ||
85 | <para>The <function>sd_bus_error_add_map()</function> call may be | |
86 | used to register additional mappings for converting D-Bus errors | |
87 | to Linux <varname>errno</varname>-style errors. The mappings | |
88 | defined with this call are consulted by calls such as | |
89 | <citerefentry><refentrytitle>sd_bus_error_set</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
90 | or | |
91 | <citerefentry><refentrytitle>sd_bus_error_get_errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>. By | |
b938cb90 | 92 | default, a number of generic, standardized mappings are known, as |
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93 | documented in |
94 | <citerefentry><refentrytitle>sd-bus-errors</refentrytitle><manvolnum>3</manvolnum></citerefentry>. Use | |
95 | this call to add further, application-specific mappings.</para> | |
96 | ||
97 | <para>The function takes a pointer to an array of | |
98 | <structname>sd_bus_error_map</structname> structures. A reference | |
99 | to the specified array is added to the lookup tables for error | |
a8eaaee7 | 100 | mappings. Note that the structure is not copied, and that it is hence |
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101 | essential that the array stays available and constant during the |
102 | entire remaining runtime of the process.</para> | |
103 | ||
104 | <para>The mapping array should be put together with a series of | |
b938cb90 | 105 | <constant>SD_BUS_ERROR_MAP()</constant> macro invocations that |
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106 | take a literal name string and a (positive) |
107 | <varname>errno</varname>-style error number. The last entry of the | |
108 | array should be an invocation of the | |
109 | <constant>SD_BUS_ERROR_MAP_END</constant> macro. The array should not be | |
110 | put together without use of these two macros.</para> | |
111 | ||
112 | <para>Note that the call is idempotent: it is safe to invoke it | |
113 | multiple times with the parameter, which will only add the passed | |
114 | mapping array once.</para> | |
115 | ||
116 | <para>Note that the memory allocated by this call is not intended | |
117 | to be freed during the lifetime of the process. It should not be | |
118 | freed explicitly.</para> | |
119 | </refsect1> | |
120 | ||
121 | <refsect1> | |
122 | <title>Return Value</title> | |
123 | ||
124 | <para><function>sd_bus_error_add_map()</function> returns a | |
125 | positive value when the new array was added to the lookup | |
126 | tables. It returns zero when the same array was already added | |
127 | before. On error, a negative <varname>errno</varname>-style error | |
128 | code is returned. See below for known error codes.</para> | |
129 | </refsect1> | |
130 | ||
131 | <refsect1> | |
132 | <title>Errors</title> | |
133 | ||
134 | <para>Returned errors may indicate the following problems:</para> | |
135 | ||
136 | <variablelist> | |
137 | ||
138 | <varlistentry> | |
139 | <term><constant>-EINVAL</constant></term> | |
140 | ||
141 | <listitem><para>The specified mapping array is invalid.</para></listitem> | |
142 | </varlistentry> | |
143 | ||
144 | <varlistentry> | |
145 | <term><constant>-ENOMEM</constant></term> | |
146 | ||
147 | <listitem><para>Memory allocation failed.</para></listitem> | |
148 | </varlistentry> | |
149 | </variablelist> | |
150 | </refsect1> | |
151 | ||
152 | <refsect1> | |
153 | <title>Notes</title> | |
154 | ||
155 | <para>The various error definitions described here are available | |
156 | as a shared library, which can be compiled and linked to with the | |
157 | <constant>libsystemd</constant> <citerefentry | |
158 | project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
159 | file.</para> | |
160 | </refsect1> | |
161 | ||
162 | <refsect1> | |
163 | <title>See Also</title> | |
164 | ||
165 | <para> | |
166 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
167 | <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
168 | <citerefentry><refentrytitle>sd_bus_error</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
169 | <citerefentry><refentrytitle>sd-bus-errors</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
170 | <citerefentry project='man-pages'><refentrytitle>errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
171 | <citerefentry project='die-net'><refentrytitle>strerror_r</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
172 | </para> | |
173 | </refsect1> | |
174 | ||
175 | </refentry> |