<?xml version='1.0'?> <!--*-nxml-*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
-<!--
- 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_add_match">
+<refentry id="sd_journal_add_match" xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>sd_journal_add_match</title>
<productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
</refentryinfo>
<refmeta>
<citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>
and
<citerefentry><refentrytitle>sd_journal_get_data</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
- Matches are of the form <literal>FIELD=value</literal>, where the
- field part is a short uppercase string consisting only of 0–9, A–Z
- and the underscore. It may not begin with two underscores or be
- the empty string. The value part may be any value, including
- binary. If a match is applied, only entries with this field set
+ Parameter <parameter>data</parameter> must be of the form
+ <literal><replaceable>FIELD</replaceable>=<replaceable>value</replaceable></literal>,
+ where the <replaceable>FIELD</replaceable> part is a short uppercase string consisting only
+ of 0–9, A–Z and the underscore; it may not begin with two underscores or be the empty
+ string. The <replaceable>value</replaceable> part may be anything, including binary. Parameter
+ <parameter>size</parameter> specifies the number of bytes in <parameter>data</parameter>
+ (i.e. the length of <replaceable>FIELD</replaceable>, plus one, plus the length of
+ <replaceable>value</replaceable>). Parameter <parameter>size</parameter> may also be
+ specified as <constant>0</constant>, in which case <parameter>data</parameter>
+ must be a <constant>NUL</constant>-terminated string, and the bytes before the terminating
+ zero are used as the match.</para>
+
+ <para>If a match is applied, only entries with this field set
will be iterated. Multiple matches may be active at the same time:
If they apply to different fields, only entries with both fields
set like this will be iterated. If they apply to the same fields,
returns nothing.</para>
</refsect1>
- <refsect1>
- <title>Notes</title>
-
- <para>The <function>sd_journal_add_match()</function>,
- <function>sd_journal_add_disjunction()</function>,
- <function>sd_journal_add_conjunction()</function> and
- <function>sd_journal_flush_matches()</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>
+ <xi:include href="libsystemd-pkgconfig.xml" />
<refsect1>
<title>Examples</title>
message ID 03bb1dab98ab4ecfbf6fff2738bdd964 coming from any
service (this example lacks the necessary error checking):</para>
- <programlisting>...
+ <programlisting>…
int add_matches(sd_journal *j) {
sd_journal_add_match(j, "_SYSTEMD_UNIT=avahi-daemon.service", 0);
sd_journal_add_match(j, "PRIORITY=0", 0);
sd_journal_add_disjunction(j);
sd_journal_add_match(j, "MESSAGE_ID=03bb1dab98ab4ecfbf6fff2738bdd964", 0);
}</programlisting>
-
</refsect1>
<refsect1>