systemd/man/sd_journal_get_catalog.xml

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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
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<refentry id="sd_journal_get_catalog" xmlns:xi="http://www.w3.org/2001/XInclude">

  <refentryinfo>
    <title>sd_journal_get_catalog</title>
    <productname>systemd</productname>
  </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 &lt;systemd/sd-journal.h&gt;</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://systemd.io/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 object at any given time. Multiple independent objects may be used from different
    threads in parallel.</para>

    <para>Function <function>sd_journal_get_catalog_for_message_id()</function> is thread-safe and may be
    called from multiple threads in parallel.</para>

    <xi:include href="libsystemd-pkgconfig.xml" xpointer="pkgconfig-text"/>
  </refsect1>

  <refsect1>
    <title>History</title>
    <para><function>sd_journal_get_catalog()</function> and
    <function>sd_journal_get_catalog_for_message_id()</function> were added in version 196.</para>
  </refsect1>

  <refsect1>
    <title>See Also</title>

    <para><simplelist type="inline">
      <member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
      <member><citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry></member>
      <member><citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
      <member><citerefentry><refentrytitle>sd_journal_open</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
      <member><citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
      <member><citerefentry><refentrytitle>sd_journal_get_data</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
      <member><citerefentry project='man-pages'><refentrytitle>malloc</refentrytitle><manvolnum>3</manvolnum></citerefentry></member>
    </simplelist></para>
  </refsect1>

</refentry>