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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">
+
+<!--
+  This file is part of systemd.
+
+  Copyright 2012 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="sd_journal_query_unique">
+
+  <refentryinfo>
+    <title>sd_journal_query_unique</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_query_unique</refentrytitle>
+    <manvolnum>3</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>sd_journal_query_unique</refname>
+    <refname>sd_journal_enumerate_unique</refname>
+    <refname>sd_journal_restart_unique</refname>
+    <refname>SD_JOURNAL_FOREACH_UNIQUE</refname>
+    <refpurpose>Read unique data fields from the journal</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <funcsynopsis>
+      <funcsynopsisinfo>#include &lt;systemd/sd-journal.h&gt;</funcsynopsisinfo>
+
+      <funcprototype>
+        <funcdef>int <function>sd_journal_query_unique</function></funcdef>
+        <paramdef>sd_journal *<parameter>j</parameter></paramdef>
+        <paramdef>const char *<parameter>field</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_journal_enumerate_unique</function></funcdef>
+        <paramdef>sd_journal *<parameter>j</parameter></paramdef>
+        <paramdef>const void **<parameter>data</parameter></paramdef>
+        <paramdef>size_t *<parameter>length</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>void <function>sd_journal_restart_unique</function></funcdef>
+        <paramdef>sd_journal *<parameter>j</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef><function>SD_JOURNAL_FOREACH_UNIQUE</function></funcdef>
+        <paramdef>sd_journal *<parameter>j</parameter></paramdef>
+        <paramdef>const void *<parameter>data</parameter></paramdef>
+        <paramdef>size_t <parameter>length</parameter></paramdef>
+      </funcprototype>
+
+    </funcsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><function>sd_journal_query_unique()</function> queries the
+    journal for all unique values the specified field can take. It
+    takes two arguments: the journal to query and the field name to
+    look for. Well-known field names are listed on
+    <citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>.
+    Field names must be specified without a trailing '='. After this
+    function has been executed successfully the field values may be
+    queried using <function>sd_journal_enumerate_unique()</function>.
+    Invoking this call a second time will change the field name being
+    queried and reset the enumeration index to the first field value
+    that matches.</para>
+
+    <para><function>sd_journal_enumerate_unique()</function> may be
+    used to iterate through all data fields which match the previously
+    selected field name as set with
+    <function>sd_journal_query_unique()</function>. On each invocation
+    the next field data matching the field name is returned. The order
+    of the returned data fields is not defined. It takes three
+    arguments: the journal context object, plus a pair of pointers to
+    pointer/size variables where the data object and its size shall be
+    stored in. The returned data is in a read-only memory map and is
+    only valid until the next invocation of
+    <function>sd_journal_enumerate_unique()</function>. Note that the
+    data returned will be prefixed with the field name and '='. Note
+    that this call is subject to the data field size threshold as
+    controlled by
+    <function>sd_journal_set_data_threshold()</function>.</para>
+
+    <para><function>sd_journal_restart_unique()</function> resets the
+    data enumeration index to the beginning of the list. The next
+    invocation of <function>sd_journal_enumerate_unique()</function>
+    will return the first field data matching the field name
+    again.</para>
+
+    <para>Note that the
+    <function>SD_JOURNAL_FOREACH_UNIQUE()</function> macro may be used
+    as a handy wrapper around
+    <function>sd_journal_restart_unique()</function> and
+    <function>sd_journal_enumerate_unique()</function>.</para>
+
+    <para>Note that these functions currently are not influenced by
+    matches set with <function>sd_journal_add_match()</function> but
+    this might change in a later version of this software.</para>
+
+    <para>To enumerate all field names currently in use (and thus all suitable field parameters for
+    <function>sd_journal_query_unique()</function>), use the
+    <citerefentry><refentrytitle>sd_journal_enumerate_fields</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    call.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Return Value</title>
+
+    <para><function>sd_journal_query_unique()</function> returns 0 on
+    success or a negative errno-style error code.
+    <function>sd_journal_enumerate_unique()</function> returns a
+    positive integer if the next field data has been read, 0 when no
+    more fields are known, or a negative errno-style error code.
+    <function>sd_journal_restart_unique()</function> returns
+    nothing.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>Notes</title>
+
+    <para>All functions listed here are thread-agnostic and only a single thread may operate
+    on a given <structname>sd_journal</structname> object.</para>
+
+    <para>The <function>sd_journal_query_unique()</function>,
+    <function>sd_journal_enumerate_unique()</function> and
+    <function>sd_journal_restart_unique()</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>Examples</title>
+
+    <para>Use the <function>SD_JOURNAL_FOREACH_UNIQUE</function> macro
+    to iterate through all values a field of the journal can take. The
+    following example lists all unit names referenced in the
+    journal:</para>
+
+    <programlisting>#include &lt;stdio.h&gt;
+#include &lt;string.h&gt;
+#include &lt;systemd/sd-journal.h&gt;
+
+int main(int argc, char *argv[]) {
+        sd_journal *j;
+        const void *d;
+        size_t l;
+        int r;
+
+        r = sd_journal_open(&amp;j, SD_JOURNAL_LOCAL_ONLY);
+        if (r &lt; 0) {
+                fprintf(stderr, "Failed to open journal: %s\n", strerror(-r));
+                return 1;
+        }
+        r = sd_journal_query_unique(j, "_SYSTEMD_UNIT");
+        if (r &lt; 0) {
+                fprintf(stderr, "Failed to query journal: %s\n", strerror(-r));
+                return 1;
+        }
+        SD_JOURNAL_FOREACH_UNIQUE(j, d, l)
+                printf("%.*s\n", (int) l, (const char*) d);
+        sd_journal_close(j);
+        return 0;
+}</programlisting>
+
+  </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_enumerate_fields</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd_journal_get_data</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd_journal_add_match</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>