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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_get_cursor">
-
- <refentryinfo>
- <title>sd_journal_get_cursor</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_cursor</refentrytitle>
- <manvolnum>3</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>sd_journal_get_cursor</refname>
- <refname>sd_journal_test_cursor</refname>
- <refpurpose>Get cursor string for or test cursor string against the current journal entry</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcsynopsisinfo>#include &lt;systemd/sd-journal.h&gt;</funcsynopsisinfo>
-
- <funcprototype>
- <funcdef>int <function>sd_journal_get_cursor</function></funcdef>
- <paramdef>sd_journal* <parameter>j</parameter></paramdef>
- <paramdef>char ** <parameter>cursor</parameter></paramdef>
- </funcprototype>
-
- <funcprototype>
- <funcdef>int <function>sd_journal_test_cursor</function></funcdef>
- <paramdef>sd_journal* <parameter>j</parameter></paramdef>
- <paramdef>const char * <parameter>cursor</parameter></paramdef>
- </funcprototype>
-
- </funcsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><function>sd_journal_get_cursor()</function>
- returns a cursor string for the current journal
- entry. A cursor is a serialization of the current
- journal position formatted as text. The string only
- contains printable characters and can be passed around
- in text form. The cursor identifies a journal entry
- globally and in a stable way and may be used to later
- seek to it via
- <citerefentry><refentrytitle>sd_journal_seek_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>. The
- cursor string should be considered opaque and not be
- parsed by clients. Seeking to a cursor position
- without the specific entry being available locally
- will seek to the next closest (in terms of time)
- available entry. The call takes two arguments: a
- journal context object and a pointer to a string
- pointer where the cursor string will be placed. The
- string is allocated via libc
- <citerefentry><refentrytitle>malloc</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- and should be freed after use with
- <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
-
- <para>Note that
- <function>sd_journal_get_cursor()</function> will not
- work before
- <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- (or related call) has been called at least once, in
- order to position the read pointer at a valid
- entry.</para>
-
- <para><function>sd_journal_test_cursor()</function>
- may be used to check whether the current position in
- the journal matches the specified cursor. This is
- useful since cursor strings do not uniquely identify
- an entry: the same entry might be referred to by
- multiple different cursor strings, and hence string
- comparing cursors is not possible. Use this call to
- verify after an invocation of
- <citerefentry><refentrytitle>sd_journal_seek_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- whether the entry being seeked to was actually found
- in the journal or the next closest entry was used
- instead.</para>
- </refsect1>
-
- <refsect1>
- <title>Return Value</title>
-
- <para><function>sd_journal_get_cursor()</function>
- returns 0 on success or a negative errno-style error
- code. <function>sd_journal_test_cursor()</function>
- returns positive if the current entry matches the
- specified cursor, 0 if it doesn't match the specified
- cursor or a negative errno-style error code on
- failure.</para>
- </refsect1>
-
- <refsect1>
- <title>Notes</title>
-
- <para>The <function>sd_journal_get_cursor()</function>
- and <function>sd_journal_test_cursor()</function>
- interfaces are available as shared library, which can
- be compiled and linked to with the
- <literal>libsystemd-journal</literal>
- <citerefentry><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>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_journal_open</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_journal_seek_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>