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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 | 6 | SPDX-License-Identifier: LGPL-2.1+ |
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7 | --> |
8 | ||
9 | <refentry id="sd_bus_error_add_map"> | |
10 | ||
11 | <refentryinfo> | |
12 | <title>sd_bus_error_add_map</title> | |
13 | <productname>systemd</productname> | |
14 | ||
15 | <authorgroup> | |
16 | <author> | |
17 | <contrib>Developer</contrib> | |
18 | <firstname>Lennart</firstname> | |
19 | <surname>Poettering</surname> | |
20 | <email>lennart@poettering.net</email> | |
21 | </author> | |
22 | </authorgroup> | |
23 | </refentryinfo> | |
24 | ||
25 | <refmeta> | |
26 | <refentrytitle>sd_bus_error_add_map</refentrytitle> | |
27 | <manvolnum>3</manvolnum> | |
28 | </refmeta> | |
29 | ||
30 | <refnamediv> | |
31 | <refname>sd_bus_error_add_map</refname> | |
32 | <refname>sd_bus_error_map</refname> | |
33 | <refname>SD_BUS_ERROR_MAP</refname> | |
34 | <refname>SD_BUS_ERROR_END</refname> | |
35 | ||
36 | <refpurpose>Additional sd-dbus error mappings</refpurpose> | |
37 | </refnamediv> | |
38 | ||
39 | <refsynopsisdiv> | |
40 | <funcsynopsis> | |
41 | <funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo> | |
42 | ||
43 | <funcsynopsisinfo>typedef struct { | |
44 | const char *name; | |
45 | int code; | |
1eecafb8 | 46 | … |
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47 | } sd_bus_error_map;</funcsynopsisinfo> |
48 | ||
49 | </funcsynopsis> | |
50 | ||
51 | <para> | |
52 | <constant>SD_BUS_ERROR_MAP(<replaceable>name</replaceable>, <replaceable>code</replaceable>)</constant> | |
53 | </para> | |
54 | <para> | |
55 | <constant>SD_BUS_ERROR_MAP_END</constant> | |
56 | </para> | |
57 | ||
58 | <funcprototype> | |
59 | <funcdef>int <function>sd_bus_error_add_map</function></funcdef> | |
60 | <paramdef>const sd_bus_map *<parameter>map</parameter></paramdef> | |
61 | </funcprototype> | |
62 | ||
63 | </refsynopsisdiv> | |
64 | ||
65 | <refsect1> | |
66 | <title>Description</title> | |
67 | ||
68 | <para>The <function>sd_bus_error_add_map()</function> call may be | |
69 | used to register additional mappings for converting D-Bus errors | |
70 | to Linux <varname>errno</varname>-style errors. The mappings | |
71 | defined with this call are consulted by calls such as | |
72 | <citerefentry><refentrytitle>sd_bus_error_set</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
73 | or | |
74 | <citerefentry><refentrytitle>sd_bus_error_get_errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>. By | |
b938cb90 | 75 | default, a number of generic, standardized mappings are known, as |
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76 | documented in |
77 | <citerefentry><refentrytitle>sd-bus-errors</refentrytitle><manvolnum>3</manvolnum></citerefentry>. Use | |
78 | this call to add further, application-specific mappings.</para> | |
79 | ||
80 | <para>The function takes a pointer to an array of | |
81 | <structname>sd_bus_error_map</structname> structures. A reference | |
82 | to the specified array is added to the lookup tables for error | |
a8eaaee7 | 83 | mappings. Note that the structure is not copied, and that it is hence |
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84 | essential that the array stays available and constant during the |
85 | entire remaining runtime of the process.</para> | |
86 | ||
87 | <para>The mapping array should be put together with a series of | |
b938cb90 | 88 | <constant>SD_BUS_ERROR_MAP()</constant> macro invocations that |
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89 | take a literal name string and a (positive) |
90 | <varname>errno</varname>-style error number. The last entry of the | |
91 | array should be an invocation of the | |
92 | <constant>SD_BUS_ERROR_MAP_END</constant> macro. The array should not be | |
93 | put together without use of these two macros.</para> | |
94 | ||
95 | <para>Note that the call is idempotent: it is safe to invoke it | |
96 | multiple times with the parameter, which will only add the passed | |
97 | mapping array once.</para> | |
98 | ||
99 | <para>Note that the memory allocated by this call is not intended | |
100 | to be freed during the lifetime of the process. It should not be | |
101 | freed explicitly.</para> | |
102 | </refsect1> | |
103 | ||
104 | <refsect1> | |
105 | <title>Return Value</title> | |
106 | ||
107 | <para><function>sd_bus_error_add_map()</function> returns a | |
108 | positive value when the new array was added to the lookup | |
109 | tables. It returns zero when the same array was already added | |
110 | before. On error, a negative <varname>errno</varname>-style error | |
111 | code is returned. See below for known error codes.</para> | |
112 | </refsect1> | |
113 | ||
114 | <refsect1> | |
115 | <title>Errors</title> | |
116 | ||
117 | <para>Returned errors may indicate the following problems:</para> | |
118 | ||
119 | <variablelist> | |
120 | ||
121 | <varlistentry> | |
122 | <term><constant>-EINVAL</constant></term> | |
123 | ||
124 | <listitem><para>The specified mapping array is invalid.</para></listitem> | |
125 | </varlistentry> | |
126 | ||
127 | <varlistentry> | |
128 | <term><constant>-ENOMEM</constant></term> | |
129 | ||
130 | <listitem><para>Memory allocation failed.</para></listitem> | |
131 | </varlistentry> | |
132 | </variablelist> | |
133 | </refsect1> | |
134 | ||
135 | <refsect1> | |
136 | <title>Notes</title> | |
137 | ||
138 | <para>The various error definitions described here are available | |
139 | as a shared library, which can be compiled and linked to with the | |
140 | <constant>libsystemd</constant> <citerefentry | |
141 | project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
142 | file.</para> | |
143 | </refsect1> | |
144 | ||
145 | <refsect1> | |
146 | <title>See Also</title> | |
147 | ||
148 | <para> | |
149 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
150 | <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
151 | <citerefentry><refentrytitle>sd_bus_error</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
152 | <citerefentry><refentrytitle>sd-bus-errors</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
153 | <citerefentry project='man-pages'><refentrytitle>errno</refentrytitle><manvolnum>3</manvolnum></citerefentry>, | |
154 | <citerefentry project='die-net'><refentrytitle>strerror_r</refentrytitle><manvolnum>3</manvolnum></citerefentry> | |
155 | </para> | |
156 | </refsect1> | |
157 | ||
158 | </refentry> |