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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!--
SPDX-License-Identifier: LGPL-2.1+
This file is part of systemd.
Copyright 2012 Lennart Poettering
-->
<refentry id="sd_journal_get_catalog">
<refentryinfo>
<title>sd_journal_get_catalog</title>
<productname>systemd</productname>
<authorgroup>
<author>
<contrib>Developer</contrib>
<firstname>Lennart</firstname>
<surname>Poettering</surname>
<email>lennart@poettering.net</email>
</author>
</authorgroup>
</refentryinfo>
<refmeta>
<refentrytitle>sd_journal_get_catalog</refentrytitle>
<manvolnum>3</manvolnum>
</refmeta>
<refnamediv>
<refname>sd_journal_get_catalog</refname>
<refname>sd_journal_get_catalog_for_message_id</refname>
<refpurpose>Retrieve message catalog entry</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcsynopsisinfo>#include <systemd/sd-journal.h></funcsynopsisinfo>
<funcprototype>
<funcdef>int <function>sd_journal_get_catalog</function></funcdef>
<paramdef>sd_journal *<parameter>j</parameter></paramdef>
<paramdef>char **<parameter>ret</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>int <function>sd_journal_get_catalog_for_message_id</function></funcdef>
<paramdef>sd_id128_t <parameter>id</parameter></paramdef>
<paramdef>char **<parameter>ret</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><function>sd_journal_get_catalog()</function> retrieves a
message catalog entry for the current journal entry. This will
look up an entry in the message catalog by using the
<literal>MESSAGE_ID=</literal> field of the current journal entry.
Before returning the entry all journal field names in the catalog
entry text enclosed in "@" will be replaced by the respective
field values of the current entry. If a field name referenced in
the message catalog entry does not exist, in the current journal
entry, the "@" will be removed, but the field name otherwise left
untouched.</para>
<para><function>sd_journal_get_catalog_for_message_id()</function>
works similar to <function>sd_journal_get_catalog()</function> but
the entry is looked up by the specified message ID (no open
journal context is necessary for this), and no field substitution
is performed.</para>
<para>For more information about the journal message catalog
please refer to the <ulink
url="https://www.freedesktop.org/wiki/Software/systemd/catalog">Journal
Message Catalogs</ulink> documentation page.</para>
</refsect1>
<refsect1>
<title>Return Value</title>
<para><function>sd_journal_get_catalog()</function> and
<function>sd_journal_get_catalog_for_message_id()</function>
return 0 on success or a negative errno-style error code. If no
matching message catalog entry is found, -ENOENT is
returned.</para>
<para>On successful return, <parameter>ret</parameter> points to a
new string, which must be freed with
<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
</para>
</refsect1>
<refsect1>
<title>Notes</title>
<para>Function <function>sd_journal_get_catalog()</function> is thread-agnostic and only a
single thread may operate on a given <structname>sd_journal</structname> object. Function
<function>sd_journal_get_catalog_for_message_id()</function> is thread-safe.</para>
<para>The <function>sd_journal_get_catalog()</function> and
<function>sd_journal_get_catalog_for_message_id()</function>
interfaces are available as a shared library, which can be
compiled and linked to with the
<constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
file.</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_open</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry><refentrytitle>sd_journal_get_data</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
<citerefentry project='man-pages'><refentrytitle>malloc</refentrytitle><manvolnum>3</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>
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