mirror of
https://github.com/systemd/systemd.git
synced 2024-12-23 21:35:11 +03:00
fdbbee37d5
Docbook styles required those to be present, even though the templates that we use did not show those names anywhere. But something changed semi-recently (I would suspect docbook templates, but there was only a minor version bump in recent years, and the changelog does not suggest anything related), and builds now work without those entries. Let's drop this dead weight. Tested with F26-F29, debian unstable. $ perl -i -0pe 's/\s*<authorgroup>.*<.authorgroup>//gms' man/*xml
185 lines
7.8 KiB
XML
185 lines
7.8 KiB
XML
<?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">
|
|
|
|
<!--
|
|
SPDX-License-Identifier: LGPL-2.1+
|
|
-->
|
|
|
|
<refentry id="systemd-notify"
|
|
xmlns:xi="http://www.w3.org/2001/XInclude">
|
|
|
|
<refentryinfo>
|
|
<title>systemd-notify</title>
|
|
<productname>systemd</productname>
|
|
</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=</varname> is set for the service unit this command is called from.</para>
|
|
|
|
<para>Note that <function>sd_notify()</function> notifications may be attributed to units correctly only if either
|
|
the sending process is still around at the time PID 1 processes the message, or if the sending process is
|
|
explicitly runtime-tracked by the service manager. The latter is the case if the service manager originally forked
|
|
off the process, i.e. on all processes that match <varname>NotifyAccess=</varname><option>main</option> or
|
|
<varname>NotifyAccess=</varname><option>exec</option>. Conversely, if an auxiliary process of the unit sends an
|
|
<function>sd_notify()</function> message and immediately exits, the service manager might not be able to properly
|
|
attribute the message to the unit, and thus will ignore it, even if
|
|
<varname>NotifyAccess=</varname><option>all</option> is set for it.</para>
|
|
|
|
<para><command>systemd-notify</command> will first attempt to invoke <function>sd_notify()</function> pretending to
|
|
have the PID of the invoking process. This will only succeed when invoked with sufficient privileges. On failure,
|
|
it will then fall back to invoking it under its own PID. This behaviour is useful in order that when the tool is
|
|
invoked from a shell script the shell process — and not the <command>systemd-notify</command> process — appears as
|
|
sender of the message, which in turn is helpful if the shell process is the main process of a service, due to the
|
|
limitations of <varname>NotifyAccess=</varname><option>all</option> described above.</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>--uid=</option><replaceable>USER</replaceable></term>
|
|
|
|
<listitem><para>Set the user ID to send the notification from. Takes a UNIX user name or numeric UID. When
|
|
specified the notification message will be sent with the specified UID as sender, in place of the user the
|
|
command was invoked as. This option requires sufficient privileges in order to be able manipulate the user
|
|
identity of the process.</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 < /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>
|