149 lines
6.2 KiB
XML
149 lines
6.2 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="sd_journal_get_cutoff_realtime_usec">
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<refentryinfo>
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<title>sd_journal_get_cutoff_realtime_usec</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>sd_journal_get_cutoff_realtime_usec</refentrytitle>
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<manvolnum>3</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>sd_journal_get_cutoff_realtime_usec</refname>
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<refname>sd_journal_get_cutoff_monotonic_usec</refname>
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<refpurpose>Read cut-off timestamps from the current journal entry</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<funcsynopsis>
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<funcsynopsisinfo>#include <systemd/sd-journal.h></funcsynopsisinfo>
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<funcprototype>
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<funcdef>int <function>sd_journal_get_cutoff_realtime_usec</function></funcdef>
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<paramdef>sd_journal *<parameter>j</parameter></paramdef>
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<paramdef>uint64_t *<parameter>from</parameter></paramdef>
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<paramdef>uint64_t *<parameter>to</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>int <function>sd_journal_get_cutoff_monotonic_usec</function></funcdef>
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<paramdef>sd_journal *<parameter>j</parameter></paramdef>
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<paramdef>sd_id128_t <parameter>boot_id</parameter></paramdef>
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<paramdef>uint64_t *<parameter>from</parameter></paramdef>
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<paramdef>uint64_t *<parameter>to</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><function>sd_journal_get_cutoff_realtime_usec()</function>
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retrieves the realtime (wallclock) timestamps of the first and
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last entries accessible in the journal. It takes three arguments:
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the journal context object <parameter>j</parameter> and two
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pointers <parameter>from</parameter> and <parameter>to</parameter>
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pointing at 64-bit unsigned integers to store the timestamps in.
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The timestamps are in microseconds since the epoch, i.e.
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<constant>CLOCK_REALTIME</constant>. Either one of the two
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timestamp arguments may be passed as <constant>NULL</constant> in
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case the timestamp is not needed, but not both.</para>
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<para><function>sd_journal_get_cutoff_monotonic_usec()</function>
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retrieves the monotonic timestamps of the first and last entries
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accessible in the journal. It takes three arguments: the journal
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context object <parameter>j</parameter>, a 128-bit identifier for
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the boot <parameter>boot_id</parameter>, and two pointers to
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64-bit unsigned integers to store the timestamps,
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<parameter>from</parameter> and <parameter>to</parameter>. The
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timestamps are in microseconds since boot-up of the specific boot,
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i.e. <constant>CLOCK_MONOTONIC</constant>. Since the monotonic
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clock begins new with every reboot it only defines a well-defined
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point in time when used together with an identifier identifying
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the boot, see
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<citerefentry><refentrytitle>sd_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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for more information. The function will return the timestamps for
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the boot identified by the passed boot ID. Either one of the two
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timestamp arguments may be passed as <constant>NULL</constant> in
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case the timestamp is not needed, but not both.</para>
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</refsect1>
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<refsect1>
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<title>Return Value</title>
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<para><function>sd_journal_get_cutoff_realtime_usec()</function>
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and <function>sd_journal_get_cutoff_monotonic_usec()</function>
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return 1 on success, 0 if not suitable entries are in the journal
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or a negative errno-style error code.</para>
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<para>Locations pointed to by parameters
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<parameter>from</parameter> and <parameter>to</parameter> will be
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set only if the return value is positive, and obviously, the
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parameters are non-null.</para>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>All functions listed here are thread-agnostic and only a single thread may operate
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on a given <structname>sd_journal</structname> object.</para>
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<para>The
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<function>sd_journal_get_cutoff_realtime_usec()</function> and
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<function>sd_journal_get_cutoff_monotonic_usec()</function>
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interfaces are available as a shared library, which can be
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compiled and linked to with the
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<constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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file.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_journal_open</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_journal_get_realtime_usec</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>clock_gettime</refentrytitle><manvolnum>2</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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