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The only difference is that functions are not individually listed by name, but that seems completely pointless, since all functions that are documented are always exported, so the generic text tells the user all she or he needs to know.
132 lines
5.3 KiB
XML
132 lines
5.3 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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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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-->
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<refentry id="sd_journal_get_cutoff_realtime_usec" xmlns:xi="http://www.w3.org/2001/XInclude">
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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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<xi:include href="libsystemd-pkgconfig.xml" xpointer="pkgconfig-text"/>
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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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