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authorLennart Poettering <lennart@poettering.net>2012-07-13 22:39:02 +0200
committerLennart Poettering <lennart@poettering.net>2012-07-13 22:39:02 +0200
commit639a6a2529dd5a3109b998ccb44fb75b97525e13 (patch)
tree030332132f59727041702d076cc7de5dc33c87fe
parentf4e761c4fc7fb43040d3ac66825fe02c33564592 (diff)
man: document sd_journal_seek_head()
-rw-r--r--Makefile.am13
-rw-r--r--man/sd_journal_seek_head.xml173
2 files changed, 184 insertions, 2 deletions
diff --git a/Makefile.am b/Makefile.am
index b9353f07b9..8e91e4977c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -508,7 +508,8 @@ MANPAGES = \
man/sd_journal_get_cutoff_realtime_usec.3 \
man/sd_journal_get_cursor.3 \
man/sd_journal_get_fd.3 \
- man/sd_journal_add_match.3
+ man/sd_journal_add_match.3 \
+ man/sd_journal_seek_head.3
MANPAGES_ALIAS = \
man/reboot.8 \
@@ -564,7 +565,11 @@ MANPAGES_ALIAS = \
man/sd_journal_process.3 \
man/sd_journal_wait.3 \
man/sd_journal_add_disjunction.3 \
- man/sd_journal_flush_matches.3
+ man/sd_journal_flush_matches.3 \
+ man/sd_journal_seek_tail.3 \
+ man/sd_journal_seek_monotonic_usec.3 \
+ man/sd_journal_seek_realtime_usec.3 \
+ man/sd_journal_seek_cursor.3
man/reboot.8: man/halt.8
man/poweroff.8: man/halt.8
@@ -620,6 +625,10 @@ man/sd_journal_process.3: man/sd_journal_get_fd.3
man/sd_journal_wait.3: man/sd_journal_get_fd.3
man/sd_journal_add_disjunction.3: man/sd_journal_add_match.3
man/sd_journal_flush_matches.3: man/sd_journal_add_match.3
+man/sd_journal_seek_tail.3: man/sd_journal_seek_head.3
+man/sd_journal_seek_monotonic_usec.3: man/sd_journal_seek_head.3
+man/sd_journal_seek_realtime_usec.3: man/sd_journal_seek_head.3
+man/sd_journal_seek_cursor.3: man/sd_journal_seek_head.3
XML_FILES = \
${patsubst %.1,%.xml,${patsubst %.3,%.xml,${patsubst %.5,%.xml,${patsubst %.7,%.xml,${patsubst %.8,%.xml,$(MANPAGES)}}}}}
diff --git a/man/sd_journal_seek_head.xml b/man/sd_journal_seek_head.xml
new file mode 100644
index 0000000000..b6a9a731c1
--- /dev/null
+++ b/man/sd_journal_seek_head.xml
@@ -0,0 +1,173 @@
+<?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_seek_head">
+
+ <refentryinfo>
+ <title>sd_journal_seek_head</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_seek_head</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_journal_seek_head</refname>
+ <refname>sd_journal_seek_tail</refname>
+ <refname>sd_journal_seek_monotonic_usec</refname>
+ <refname>sd_journal_seek_realtime_usec</refname>
+ <refname>sd_journal_seek_cursor</refname>
+ <refpurpose>Seek to a position in the
+ journal</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include &lt;systemd/sd-journal.h&gt;</funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>int <function>sd_journal_seek_head</function></funcdef>
+ <paramdef>sd_journal* <parameter>j</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_journal_seek_tail</function></funcdef>
+ <paramdef>sd_journal* <parameter>j</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_journal_seek_monotonic_usec</function></funcdef>
+ <paramdef>sd_journal* <parameter>j</parameter></paramdef>
+ <paramdef>sd_id128_t <parameter>boot_id</parameter></paramdef>
+ <paramdef>uint64_t <parameter>usec</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_journal_seek_realtime_usec</function></funcdef>
+ <paramdef>sd_journal* <parameter>j</parameter></paramdef>
+ <paramdef>uint64_t <parameter>usec</parameter></paramdef>
+ </funcprototype>
+
+ <funcprototype>
+ <funcdef>int <function>sd_journal_seek_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_seek_head()</function>
+ seeks to the beginning of the journal, i.e. the oldest
+ avilable entry.</para>
+
+ <para>Similar,
+ <function>sd_journal_seek_tail()</function> may be
+ used to seek to the end of the journal, i.e. the most
+ recent available entry.</para>
+
+ <para><function>sd_journal_seek_monotonic_usec()</function>
+ seeks to the entry with the specified monotonic
+ timestamp, i.e. CLOCK_MONOOTONIC. Since monotonic time
+ restarts on every reboot a boot ID needs to be
+ specified as well.</para>
+
+ <para><function>sd_journal_seek_realtime_usec()</function>
+ seeks to the entry with the specified realtime
+ (wallclock) timestamp, i.e. CLOCK_REALTIME. Note that
+ the realtime clock is not necessary monotonic. If a
+ realtime timestamp is ambiguous it is not defined
+ which position is seeked to.</para>
+
+ <para><function>sd_journal_seek_cursor()</function>
+ seeks to the entry located at the specified cursor
+ string. For details on cursors see
+ <citerefentry><refentrytitle>sd_journal_get_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
+
+ <para>Note that these calls do not actually make any
+ entry the new current entry, this needs to be done in
+ a separate step with a subsequent
+ <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ invocation (or a similar call). Only then entry data
+ may be retrieved via
+ <citerefentry><refentrytitle>sd_journal_get_data</refentrytitle><manvolnum>3</manvolnum></citerefentry>. If
+ no entry exists that matches exactly the specified
+ seek address the next closest is seeked to. If
+ <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ is used the closest following entry will be seeked to,
+ if
+ <citerefentry><refentrytitle>sd_journal_previous</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ is used the closest preceeding entry is seeked
+ to.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para>The functions return 0 on success or a negative
+ errno-style error code.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Notes</title>
+
+ <para>The <function>sd_journal_seek_head()</function>,
+ <function>sd_journal_seek_tail()</function>,
+ <function>sd_journal_seek_monotonic_usec()</function>,
+ <function>sd_journal_seek_realtime_usec()</function>,
+ and <function>sd_journal_seek_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_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_journal_get_data</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_journal_get_cursor</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_journal_get_realtime_usec</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>