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