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120 lines
4.9 KiB
XML
120 lines
4.9 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
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<refentry id="sd_journal_get_catalog" xmlns:xi="http://www.w3.org/2001/XInclude">
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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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</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
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a single specific thread may operate on a given object during its entire lifetime. It's safe to allocate multiple
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independent objects and use each from a specific thread in parallel. However, it's not safe to allocate such an
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object in one thread, and operate or free it from any other, even if locking is used to ensure these threads don't
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operate on it at the very same time.</para>
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<para>Function <function>sd_journal_get_catalog_for_message_id()</function> is are thread-safe and may be called in
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parallel from multiple threads.</para>
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<xi:include href="libsystemd-pkgconfig.xml" xpointer="pkgconfig-text"/>
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</refsect1>
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<refsect1>
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<title>History</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> were added in version 196.</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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