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[elogind.git] / man / sd_journal_get_catalog.xml
1 <?xml version='1.0'?> <!--*-nxml-*-->
2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
3   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
4
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8   Copyright 2012 Lennart Poettering
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23
24 <refentry id="sd_journal_get_catalog">
25
26   <refentryinfo>
27     <title>sd_journal_get_catalog</title>
28     <productname>systemd</productname>
29
30     <authorgroup>
31       <author>
32         <contrib>Developer</contrib>
33         <firstname>Lennart</firstname>
34         <surname>Poettering</surname>
35         <email>lennart@poettering.net</email>
36       </author>
37     </authorgroup>
38   </refentryinfo>
39
40   <refmeta>
41     <refentrytitle>sd_journal_get_catalog</refentrytitle>
42     <manvolnum>3</manvolnum>
43   </refmeta>
44
45   <refnamediv>
46     <refname>sd_journal_get_catalog</refname>
47     <refname>sd_journal_get_catalog_for_message_id</refname>
48     <refpurpose>Retrieve message catalog entry</refpurpose>
49   </refnamediv>
50
51   <refsynopsisdiv>
52     <funcsynopsis>
53       <funcsynopsisinfo>#include &lt;systemd/sd-journal.h&gt;</funcsynopsisinfo>
54
55       <funcprototype>
56         <funcdef>int <function>sd_journal_get_catalog</function></funcdef>
57         <paramdef>sd_journal *<parameter>j</parameter></paramdef>
58         <paramdef>char **<parameter>ret</parameter></paramdef>
59       </funcprototype>
60
61       <funcprototype>
62         <funcdef>int <function>sd_journal_get_catalog_for_message_id</function></funcdef>
63         <paramdef>sd_id128_t <parameter>id</parameter></paramdef>
64         <paramdef>char **<parameter>ret</parameter></paramdef>
65       </funcprototype>
66
67
68     </funcsynopsis>
69   </refsynopsisdiv>
70
71   <refsect1>
72     <title>Description</title>
73
74     <para><function>sd_journal_get_catalog()</function> retrieves a
75     message catalog entry for the current journal entry. This will
76     look up an entry in the message catalog by using the
77     <literal>MESSAGE_ID=</literal> field of the current journal entry.
78     Before returning the entry all journal field names in the catalog
79     entry text enclosed in "@" will be replaced by the respective
80     field values of the current entry. If a field name referenced in
81     the message catalog entry does not exist, in the current journal
82     entry, the "@" will be removed, but the field name otherwise left
83     untouched.</para>
84
85     <para><function>sd_journal_get_catalog_for_message_id()</function>
86     works similar to <function>sd_journal_get_catalog()</function> but
87     the entry is looked up by the specified message ID (no open
88     journal context is necessary for this), and no field substitution
89     is performed.</para>
90
91     <para>For more information about the journal message catalog
92     please refer to the <ulink
93     url="http://www.freedesktop.org/wiki/Software/systemd/catalog">Journal
94     Message Catalogs</ulink> documentation page.</para>
95   </refsect1>
96
97   <refsect1>
98     <title>Return Value</title>
99
100     <para><function>sd_journal_get_catalog()</function> and
101     <function>sd_journal_get_catalog_for_message_id()</function>
102     return 0 on success or a negative errno-style error code. If no
103     matching message catalog entry is found, -ENOENT is
104     returned.</para>
105
106     <para>On successful return, <parameter>ret</parameter> points to a
107     new string, which must be freed with
108     <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
109     </para>
110   </refsect1>
111
112   <refsect1>
113     <title>Notes</title>
114
115     <para>The <function>sd_journal_get_catalog()</function> and
116     <function>sd_journal_get_catalog_for_message_id()</function>
117     interfaces are available as a shared library, which can be
118     compiled and linked to with the
119     <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
120     file.</para>
121   </refsect1>
122
123   <refsect1>
124     <title>See Also</title>
125
126     <para>
127       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
128       <citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
129       <citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
130       <citerefentry><refentrytitle>sd_journal_open</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
131       <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
132       <citerefentry><refentrytitle>sd_journal_get_data</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
133       <citerefentry><refentrytitle>malloc</refentrytitle><manvolnum>3</manvolnum></citerefentry>
134     </para>
135   </refsect1>
136
137 </refentry>