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authorLuke Shumaker <lukeshu@sbcglobal.net>2016-09-13 16:41:31 -0400
committerLuke Shumaker <lukeshu@sbcglobal.net>2016-09-13 16:41:31 -0400
commitd3f2bd38c85b5e9484dbe55094e53a561fb46b6e (patch)
treefda125cd5c1243c0750dc814f4cc0b0adcdaf28d /man/systemd-notify.xml
parent85ac1aeee9bfd78f017f4f2bf73629c3456f2775 (diff)
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-<?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 2010 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="systemd-notify"
- xmlns:xi="http://www.w3.org/2001/XInclude">
-
- <refentryinfo>
- <title>systemd-notify</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>systemd-notify</refentrytitle>
- <manvolnum>1</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>systemd-notify</refname>
- <refpurpose>Notify service manager about start-up completion and other daemon status changes</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <cmdsynopsis>
- <command>systemd-notify <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="opt" rep="repeat">VARIABLE=VALUE</arg></command>
- </cmdsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><command>systemd-notify</command> may be called by daemon
- scripts to notify the init system about status changes. It can be
- used to send arbitrary information, encoded in an
- environment-block-like list of strings. Most importantly, it can be
- used for start-up completion notification.</para>
-
- <para>This is mostly just a wrapper around
- <function>sd_notify()</function> and makes this functionality
- available to shell scripts. For details see
- <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
- </para>
-
- <para>The command line may carry a list of environment variables
- to send as part of the status update.</para>
-
- <para>Note that systemd will refuse reception of status updates
- from this command unless <varname>NotifyAccess=all</varname> is
- set for the service unit this command is called from.</para>
-
- </refsect1>
-
- <refsect1>
- <title>Options</title>
-
- <para>The following options are understood:</para>
-
- <variablelist>
- <varlistentry>
- <term><option>--ready</option></term>
-
- <listitem><para>Inform the init system about service start-up
- completion. This is equivalent to <command>systemd-notify
- READY=1</command>. For details about the semantics of this
- option see
- <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>--pid=</option></term>
-
- <listitem><para>Inform the init system about the main PID of
- the daemon. Takes a PID as argument. If the argument is
- omitted, the PID of the process that invoked
- <command>systemd-notify</command> is used. This is equivalent
- to <command>systemd-notify MAINPID=$PID</command>. For details
- about the semantics of this option see
- <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>--status=</option></term>
-
- <listitem><para>Send a free-form status string for the daemon
- to the init systemd. This option takes the status string as
- argument. This is equivalent to <command>systemd-notify
- STATUS=...</command>. For details about the semantics of this
- option see
- <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem>
- </varlistentry>
-
- <varlistentry>
- <term><option>--booted</option></term>
-
- <listitem><para>Returns 0 if the system was booted up with
- systemd, non-zero otherwise. If this option is passed, no
- message is sent. This option is hence unrelated to the other
- options. For details about the semantics of this option, see
- <citerefentry><refentrytitle>sd_booted</refentrytitle><manvolnum>3</manvolnum></citerefentry>. An
- alternate way to check for this state is to call
- <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
- with the <command>is-system-running</command> command. It will
- return <literal>offline</literal> if the system was not booted
- with systemd. </para></listitem>
- </varlistentry>
-
- <xi:include href="standard-options.xml" xpointer="help" />
- <xi:include href="standard-options.xml" xpointer="version" />
- </variablelist>
-
- </refsect1>
-
- <refsect1>
- <title>Exit status</title>
-
- <para>On success, 0 is returned, a non-zero failure code
- otherwise.</para>
- </refsect1>
-
- <refsect1>
- <title>Example</title>
-
- <example>
- <title>Start-up Notification and Status Updates</title>
-
- <para>A simple shell daemon that sends start-up notifications
- after having set up its communication channel. During runtime it
- sends further status updates to the init system:</para>
-
- <programlisting>#!/bin/bash
-
-mkfifo /tmp/waldo
-systemd-notify --ready --status="Waiting for data..."
-
-while : ; do
- read a &lt; /tmp/waldo
- systemd-notify --status="Processing $a"
-
- # Do something with $a ...
-
- systemd-notify --status="Waiting for data..."
-done</programlisting>
- </example>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd_booted</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>