5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
219 lines
9.5 KiB
XML
219 lines
9.5 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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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-notify">
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<refentryinfo>
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<title>systemd-notify</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>systemd-notify</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-notify</refname>
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<refpurpose>Notify init system about start-up completion and other daemon status changes</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-notify <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="opt" rep="repeat">VARIABLE=VALUE</arg></command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>systemd-notify</command> may be
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called by daemon scripts to notify the init system
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about status changes. It can be used to send arbitrary
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information, encoded in an environment-block-like list
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of strings. Most importantly it can be used for
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start-up completion notification.</para>
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<para>This is mostly just a wrapper around
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<function>sd_notify()</function> and makes this
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functionality available to shell scripts. For details
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see
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<citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
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<para>The command line may carry a list of
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environment variables to send as part of the status
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update.</para>
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<para>Note that systemd will refuse reception of
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status updates from this command unless
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<varname>NotifyAccess=all</varname> is set for the
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service unit this command is called from.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>--h</option></term>
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<term><option>--help</option></term>
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<listitem><para>Prints a short help
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text and exits.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--version</option></term>
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<listitem><para>Prints a short version
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string and exits.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--ready</option></term>
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<listitem><para>Inform the init system
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about service start-up
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completion. This is equivalent to
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<command>systemd-notify
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READY=1</command>. For details about
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the semantics of this option see
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<citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--pid=</option></term>
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<listitem><para>Inform the init system
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about the main PID of the
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daemon. Takes a PID as argument. If
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the argument is omitted the PID of the
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process that invoked
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<command>systemd-notify</command> is
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used. This is equivalent to
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<command>systemd-notify
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MAINPID=$PID</command>. For details
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about the semantics of this option see
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<citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--status=</option></term>
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<listitem><para>Send a free-form
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status string for the daemon to the
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init systemd. This option takes the
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status string as argument. This is
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equivalent to <command>systemd-notify
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STATUS=...</command>. For details
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about the semantics of this option see
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<citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--booted</option></term>
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<listitem><para>Returns 0 if the
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system was booted up with systemd,
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non-zero otherwise. If this option is
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passed no message is sent. This option
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is hence unrelated to the other
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options. For details about the
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semantics of this option see
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<citerefentry><refentrytitle>sd_booted</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--readahead=</option></term>
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<listitem><para>Controls disk
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read-ahead operations. The argument
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must be a string, and either "cancel",
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"done" or "noreplay". For details
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about the semantics of this option see
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<citerefentry><refentrytitle>sd_readahead</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success 0 is returned, a non-zero failure
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code otherwise.</para>
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</refsect1>
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<refsect1>
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<title>Example</title>
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<example>
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<title>Start-up Notification and Status Updates</title>
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<para>A simple shell daemon that sends
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start-up notifications after having set up its
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communication channel. During runtime it sends
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further status updates to the init
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system:</para>
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<programlisting>#!/bin/bash
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mkfifo /tmp/waldo
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systemd-notify --ready --status="Waiting for data..."
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while : ; do
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read a < /tmp/waldo
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systemd-notify --status="Processing $a"
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# Do something with $a ...
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systemd-notify --status="Waiting for data..."
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done</programlisting>
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</example>
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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>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_booted</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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