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<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 &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://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>
