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-<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
-<!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 2015 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_event_now" xmlns:xi="http://www.w3.org/2001/XInclude">
-
- <refentryinfo>
- <title>sd_event_now</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_event_now</refentrytitle>
- <manvolnum>3</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>sd_event_now</refname>
-
- <refpurpose>Retrieve current event loop iteration timestamp</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcsynopsisinfo>#include &lt;systemd/sd-event.h&gt;</funcsynopsisinfo>
-
- <funcprototype>
- <funcdef>int <function>sd_event_now</function></funcdef>
- <paramdef>sd_event *<parameter>event</parameter></paramdef>
- <paramdef>clockid_t <parameter>clock</parameter></paramdef>
- <paramdef>uint64_t *<parameter>usec</parameter></paramdef>
- </funcprototype>
-
- </funcsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><function>sd_event_now()</function> returns the time when
- the most recent event loop iteration began. A timestamp
- is taken right after returning from the event sleep, and before
- dispatching any event sources. The <parameter>event</parameter>
- parameter specifies the event loop object to retrieve the timestamp
- from. The <parameter>clock</parameter> parameter specifies the clock to
- retrieve the timestamp for, and is one of
- <constant>CLOCK_REALTIME</constant> (or equivalently
- <constant>CLOCK_REALTIME_ALARM</constant>),
- <constant>CLOCK_MONOTONIC</constant>, or
- <constant>CLOCK_BOOTTIME</constant> (or equivalently
- <constant>CLOCK_BOOTTIME_ALARM</constant>), see
- <citerefentry project='man-pages'><refentrytitle>clock_gettime</refentrytitle><manvolnum>2</manvolnum></citerefentry>
- for more information on the various clocks. The retrieved
- timestamp is stored in the <parameter>usec</parameter> parameter,
- in µs since the clock's epoch. If this function is invoked before
- the first event loop iteration, the current time is returned, as
- reported by <function>clock_gettime()</function>. To distinguish
- this case from a regular invocation the return value will be
- positive, and zero when the returned timestamp refers to an actual
- event loop iteration.</para>
- </refsect1>
-
- <refsect1>
- <title>Return Value</title>
-
- <para>If the first event loop iteration has not run yet
- <function>sd_event_now()</function> writes current time to
- <parameter>usec</parameter> and returns a positive return value.
- Otherwise, it will write the requested timestamp to <parameter>usec</parameter>
- and return 0. On failure, the call returns a negative errno-style
- error code.</para>
- </refsect1>
-
- <refsect1>
- <title>Errors</title>
-
- <para>Returned values may indicate the following problems:</para>
-
- <variablelist>
- <varlistentry>
- <term><constant>-EINVAL</constant></term>
-
- <listitem><para>An invalid parameter was
- passed.</para></listitem>
-
- </varlistentry>
-
- <varlistentry>
- <term><constant>-EOPNOTSUPP</constant></term>
-
- <listitem><para>Unsupported clock type.
- </para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><constant>-ECHILD</constant></term>
-
- <listitem><para>The event loop object was created in a
- different process.</para></listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-
- <xi:include href="libsystemd-pkgconfig.xml" />
-
- <refsect1>
- <title>See Also</title>
-
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd-event</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_event_new</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_event_add_time</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry project='man-pages'><refentrytitle>clock_gettime</refentrytitle><manvolnum>2</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>