mirror of
https://github.com/systemd/systemd.git
synced 2024-11-01 17:51:22 +03:00
bb31a4ac19
https://bugs.freedesktop.org/show_bug.cgi?id=55890
Fixed typos, serial comma, and removed "either" as there were more
than two options. Also did an extra rename of "system-shutdown"
to "systemd-shutdown" that was forgotten in commit
8bd3b8620c
179 lines
8.7 KiB
XML
179 lines
8.7 KiB
XML
<?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 <systemd/sd-journal.h></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
|
|
available 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 necessarily monotonic. If a
|
|
realtime timestamp is ambiguous it is not defined
|
|
which position is sought 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>. If
|
|
no entry matching the specified cursor is found the
|
|
call will seek to the next closest entry (in terms of
|
|
time) instead. To verify whether the newly selected
|
|
entry actually matches the cursor use
|
|
<citerefentry><refentrytitle>sd_journal_test_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 sought to. If
|
|
<citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
is used the closest following entry will be sought to,
|
|
if
|
|
<citerefentry><refentrytitle>sd_journal_previous</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
|
is used the closest preceding entry is sought
|
|
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>
|