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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_open">
-
- <refentryinfo>
- <title>sd_journal_open</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_open</refentrytitle>
- <manvolnum>3</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>sd_journal_open</refname>
- <refname>sd_journal_open_directory</refname>
- <refname>sd_journal_close</refname>
- <refname>sd_journal</refname>
- <refname>SD_JOURNAL_LOCAL_ONLY</refname>
- <refname>SD_JOURNAL_RUNTIME_ONLY</refname>
- <refname>SD_JOURNAL_SYSTEM_ONLY</refname>
- <refpurpose>Open the system journal for reading</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcsynopsisinfo>#include &lt;systemd/sd-journal.h&gt;</funcsynopsisinfo>
-
- <funcprototype>
- <funcdef>int <function>sd_journal_open</function></funcdef>
- <paramdef>sd_journal** <parameter>ret</parameter></paramdef>
- <paramdef>int <parameter>flags</parameter></paramdef>
- </funcprototype>
-
- <funcprototype>
- <funcdef>int <function>sd_journal_open_directory</function></funcdef>
- <paramdef>sd_journal** <parameter>ret</parameter></paramdef>
- <paramdef>const char* <parameter>path</parameter></paramdef>
- <paramdef>int <parameter>flags</parameter></paramdef>
- </funcprototype>
-
- <funcprototype>
- <funcdef>int <function>sd_journal_close</function></funcdef>
- <paramdef>sd_journal* <parameter>j</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><function>sd_journal_open()</function> opens
- the log journal for reading. It will find all journal
- files automatically and interleave them automatically
- when reading. As first argument it takes a pointer to
- a <literal>sd_journal</literal> pointer, which on
- success will contain journal context object afterwards. The
- second argument is a flags field, which may consist of
- the following flags ORed together:
- <literal>SD_JOURNAL_LOCAL_ONLY</literal> makes sure
- only journal files generated on the local machine will
- be opened. <literal>SD_JOURNAL_RUNTIME_ONLY</literal>
- makes sure only volatile journal files will be opened,
- excluding those which are stored on persistent
- storage. <literal>SD_JOURNAL_SYSTEM_ONLY</literal>
- will ensure that only journal files of system services
- and the kernel (in opposition to user session processes) will
- be opened.</para>
-
- <para><function>sd_journal_open_directory()</function>
- is similar to <function>sd_journal_open()</function>
- but takes an absolute directory path as argument. All
- journal files in this directory will be opened and
- interleaved automatically. This call also takes a
- flags argument, but it must be passed as 0 as no flags
- are currently understood for this call.</para>
-
- <para><function>sd_journal_close()</function> will
- close the journal context allocated with
- <function>sd_journal_open()</function> or
- <function>sd_journal_open_directory()</function> and
- free its resources.</para>
-
- <para>When opening the journal only journal files
- accessible to the calling user will be opened. If
- journal files are not accessible to the caller this
- will be silently ignored.</para>
-
- <para>See
- <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- for an example how to iterate through the journal
- after opening it with
- <function>sd_journal_open()</function>.</para>
-
- <para>A journal context object returned by
- <function>sd_journal_open()</function> references a
- specific journal entry as <emphasis>current</emphasis> entry,
- similar to a file seek index in a classic file system
- file, but without absolute positions. It may be
- altered with
- <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- and
- <citerefentry><refentrytitle>sd_journal_seek_head</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- and related calls. The current entry position may be
- exported in <emphasis>cursor</emphasis> strings, as accessible
- via
- <citerefentry><refentrytitle>sd_journal_get_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>. Cursor
- strings may be used to globally identify a specific
- journal entry in a stable way and then later to seek
- to it (or if the specific entry is not available
- locally, to its closest entry in time)
- <citerefentry><refentrytitle>sd_journal_seek_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
-
- <para>Notification of journal changes is available via
- <function>sd_journal_get_fd()</function> and related
- calls.</para>
- </refsect1>
-
- <refsect1>
- <title>Return Value</title>
-
- <para>The <function>sd_journal_open()</function> and
- <function>sd_journal_open_directory()</function> calls
- return 0 on success or a negative errno-style error
- code. <function>sd_journal_close()</function> returns
- nothing.</para>
- </refsect1>
-
- <refsect1>
- <title>Notes</title>
-
- <para>The <function>sd_journal_open()</function>,
- <function>sd_journal_open_directory()</function> and
- <function>sd_journal_close()</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_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_journal_get_data</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>