<?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_get_realtime_usec">
-
- <refentryinfo>
- <title>sd_journal_get_realtime_usec</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_get_realtime_usec</refentrytitle>
- <manvolnum>3</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>sd_journal_get_realtime_usec</refname>
- <refname>sd_journal_get_monotonic_usec</refname>
- <refpurpose>Read timestamps from the current journal entry</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcsynopsisinfo>#include <systemd/sd-journal.h></funcsynopsisinfo>
-
- <funcprototype>
- <funcdef>int <function>sd_journal_get_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_get_monotonic_usec</function></funcdef>
- <paramdef>sd_journal* <parameter>j</parameter></paramdef>
- <paramdef>uint64_t* <parameter>usec</parameter></paramdef>
- <paramdef>sd_id128_t* <parameter>boot_id</parameter></paramdef>
- </funcprototype>
-
- </funcsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><function>sd_journal_get_realtime_usec()</function>
- gets the realtime (wallclock) timestamp of the
- current journal entry. It takes two arguments: the
- journal context object and a pointer to a 64-bit
- unsigned integer to store the timestamp in. The
- timestamp is in microseconds since the epoch,
- i.e. <constant>CLOCK_REALTIME</constant>.</para>
-
- <para><function>sd_journal_get_monotonic_usec()</function>
- gets the monotonic timestamp of the current journal
- entry. It takes three arguments: the journal context
- object, a pointer to a 64-bit unsigned integer to
- store the timestamp in, as well as a 128-bit ID buffer
- to store the boot ID of the monotonic timestamp.
- The timestamp is in microseconds since boot-up of
- the specific boot,
- i.e. <constant>CLOCK_MONOTONIC</constant>. Since the
- monotonic clock begins new with every reboot, it only
- defines a well-defined point in time when used
- together with an identifier identifying the boot. See
- <citerefentry><refentrytitle>sd_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- for more information. If the boot ID parameter is
- passed <constant>NULL</constant>, the function will
- fail if the monotonic timestamp of the current entry
- is not of the current system boot.</para>
-
- <para>Note that these functions will not work before
- <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- (or related call) has been called at least
- once, in order to position the read pointer at a valid entry.</para>
- </refsect1>
-
- <refsect1>
- <title>Return Value</title>
-
- <para><function>sd_journal_get_realtime_usec()</function>
- and
- <function>sd_journal_get_monotonic_usec()</function>
- returns 0 on success or a negative errno-style error
- code. If the boot ID parameter was passed <constant>NULL</constant> and the
- monotonic timestamp of the current journal entry is
- not of the current system boot, -ESTALE is returned by <function>sd_journal_get_monotonic_usec()</function>.</para>
- </refsect1>
-
- <refsect1>
- <title>Notes</title>
-
- <para>The
- <function>sd_journal_get_realtime_usec()</function>
- and
- <function>sd_journal_get_monotonic_usec()</function>
- interfaces are available as a shared library, which can
- be compiled and linked to with the
- <constant>libsystemd</constant> <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_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>clock_gettime</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_journal_get_cutoff_realtime_usec</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- </para>
- </refsect1>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
+
+<refentry id="sd_journal_get_realtime_usec"
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <refentryinfo>
+ <title>sd_journal_get_realtime_usec</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>sd_journal_get_realtime_usec</refentrytitle>
+ <manvolnum>3</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>sd_journal_get_realtime_usec</refname>
+ <refname>sd_journal_get_monotonic_usec</refname>
+ <refpurpose>Read timestamps from the current journal entry</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <funcsynopsis>
+ <funcsynopsisinfo>#include <systemd/sd-journal.h></funcsynopsisinfo>
+
+ <funcprototype>
+ <funcdef>int <function>sd_journal_get_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_get_monotonic_usec</function></funcdef>
+ <paramdef>sd_journal *<parameter>j</parameter></paramdef>
+ <paramdef>uint64_t *<parameter>usec</parameter></paramdef>
+ <paramdef>sd_id128_t *<parameter>boot_id</parameter></paramdef>
+ </funcprototype>
+
+ </funcsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para><function>sd_journal_get_realtime_usec()</function> gets the
+ realtime (wallclock) timestamp of the current journal entry. It
+ takes two arguments: the journal context object and a pointer to a
+ 64-bit unsigned integer to store the timestamp in. The timestamp
+ is in microseconds since the epoch, i.e.
+ <constant>CLOCK_REALTIME</constant>.</para>
+
+ <para><function>sd_journal_get_monotonic_usec()</function> gets
+ the monotonic timestamp of the current journal entry. It takes
+ three arguments: the journal context object, a pointer to a 64-bit
+ unsigned integer to store the timestamp in, as well as a 128-bit
+ ID buffer to store the boot ID of the monotonic timestamp. The
+ timestamp is in microseconds since boot-up of the specific boot,
+ i.e. <constant>CLOCK_MONOTONIC</constant>. Since the monotonic
+ clock begins new with every reboot, it only defines a well-defined
+ point in time when used together with an identifier identifying
+ the boot. See
+ <citerefentry><refentrytitle>sd_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ for more information. If the boot ID parameter is passed
+ <constant>NULL</constant>, the function will fail if the monotonic
+ timestamp of the current entry is not of the current system
+ boot.</para>
+
+ <para>Note that these functions will not work before
+ <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ (or related call) has been called at least
+ once, in order to position the read pointer at a valid entry.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Return Value</title>
+
+ <para><function>sd_journal_get_realtime_usec()</function> and
+ <function>sd_journal_get_monotonic_usec()</function> returns 0 on
+ success or a negative errno-style error code. If the boot ID
+ parameter was passed <constant>NULL</constant> and the monotonic
+ timestamp of the current journal entry is not of the current
+ system boot, <constant>-ESTALE</constant> is returned by
+ <function>sd_journal_get_monotonic_usec()</function>.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>Notes</title>
+
+ <xi:include href="threads-aware.xml" xpointer="strict"/>
+
+ <xi:include href="libsystemd-pkgconfig.xml" xpointer="pkgconfig-text"/>
+ </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_id128_get_boot</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>clock_gettime</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>sd_journal_get_cutoff_realtime_usec</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ </para>
+ </refsect1>
</refentry>
projects / thirdparty / systemd.git / blobdiff