chiark / gitweb /
sd-login: add a public accessor for the VT number
[elogind.git] / man / sd_notify.xml
index 9d9ea4132f9b787b5807c45ca6177f441afb5216..fc0f2f69273f0377cf56f2f8cf62f49857e692f5 100644 (file)
@@ -8,16 +8,16 @@
   Copyright 2010 Lennart Poettering
 
   systemd is free software; you can redistribute it and/or modify it
   Copyright 2010 Lennart Poettering
 
   systemd is free software; you can redistribute it and/or modify it
-  under the terms of the GNU General Public License as published by
-  the Free Software Foundation; either version 2 of the License, or
+  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
   (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
-  General Public License for more details.
+  Lesser General Public License for more details.
 
 
-  You should have received a copy of the GNU General Public License
+  You should have received a copy of the GNU Lesser General Public License
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 -->
 
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 -->
 
@@ -45,7 +45,7 @@
         <refnamediv>
                 <refname>sd_notify</refname>
                 <refname>sd_notifyf</refname>
         <refnamediv>
                 <refname>sd_notify</refname>
                 <refname>sd_notifyf</refname>
-                <refpurpose>Notify init system about start-up completion and other daemon status changes</refpurpose>
+                <refpurpose>Notify service manager about start-up completion and other daemon status changes</refpurpose>
         </refnamediv>
 
         <refsynopsisdiv>
         </refnamediv>
 
         <refsynopsisdiv>
@@ -87,7 +87,7 @@
                 processes.</para>
 
                 <para>The <parameter>state</parameter> parameter
                 processes.</para>
 
                 <para>The <parameter>state</parameter> parameter
-                should contain an newline-separated list of variable
+                should contain a newline-separated list of variable
                 assignments, similar in style to an environment
                 block. A trailing newline is implied if none is
                 specified. The string may contain any kind of variable
                 assignments, similar in style to an environment
                 block. A trailing newline is implied if none is
                 specified. The string may contain any kind of variable
                                 definition file has Type=notify
                                 set. The passed argument is a boolean
                                 "1" or "0". Since there is little
                                 definition file has Type=notify
                                 set. The passed argument is a boolean
                                 "1" or "0". Since there is little
-                                value in signalling non-readiness, the
+                                value in signaling non-readiness, the
                                 only value daemons should send is
                                 "READY=1".</para></listitem>
                         </varlistentry>
                                 only value daemons should send is
                                 "READY=1".</para></listitem>
                         </varlistentry>
                                 <term>WATCHDOG=1</term>
 
                                 <listitem><para>Tells systemd to
                                 <term>WATCHDOG=1</term>
 
                                 <listitem><para>Tells systemd to
-                                update the watchdog timestamp.
-                                Services using this feature should do
-                                this in regular intervals. A watchdog
-                                framework can use the timestamps to
-                                detect failed
-                                services.</para></listitem>
+                                update the watchdog timestamp. This is
+                                the keep-alive ping that services need
+                                to issue in regular intervals if
+                                <varname>WatchdogSec=</varname> is
+                                enabled for it. See
+                                <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+                                for details. It is recommended to send
+                                this message if the
+                                <varname>WATCHDOG_USEC=</varname>
+                                environment variable has been set for
+                                the service process, in every half the
+                                time interval that is specified in the
+                                variable.</para></listitem>
                         </varlistentry>
                 </variablelist>
 
                         </varlistentry>
                 </variablelist>
 
                 the status was sent these functions return with a
                 positive return value. In order to support both, init
                 systems that implement this scheme and those which
                 the status was sent these functions return with a
                 positive return value. In order to support both, init
                 systems that implement this scheme and those which
-                don't, it is generally recommended to ignore the return
+                do not, it is generally recommended to ignore the return
                 value of this call.</para>
         </refsect1>
 
                 value of this call.</para>
         </refsect1>
 
 
                 <para>Internally, these functions send a single
                 datagram with the state string as payload to the
 
                 <para>Internally, these functions send a single
                 datagram with the state string as payload to the
-                AF_UNIX socket referenced in the
+                <constant>AF_UNIX</constant> socket referenced in the
                 <varname>$NOTIFY_SOCKET</varname> environment
                 variable. If the first character of
                 <varname>$NOTIFY_SOCKET</varname> environment
                 variable. If the first character of
-                <varname>$NOTIFY_SOCKET</varname> is @ the string is
+                <varname>$NOTIFY_SOCKET</varname> is <literal>@</literal> the string is
                 understood as Linux abstract namespace socket. The
                 datagram is accompanied by the process credentials of
                 the sending daemon, using SCM_CREDENTIALS.</para>
 
                 <para>For details about the algorithms check the
                 liberally licensed reference implementation sources:
                 understood as Linux abstract namespace socket. The
                 datagram is accompanied by the process credentials of
                 the sending daemon, using SCM_CREDENTIALS.</para>
 
                 <para>For details about the algorithms check the
                 liberally licensed reference implementation sources:
-                <ulink url="http://cgit.freedesktop.org/systemd/systemd/plain/src/sd-daemon.c"/>
-                resp. <ulink
+                <ulink url="http://cgit.freedesktop.org/systemd/systemd/plain/src/libsystemd-daemon/sd-daemon.c"/>
+                and <ulink
                 url="http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-daemon.h"/></para>
 
                 <para><function>sd_notify()</function> and
                 url="http://cgit.freedesktop.org/systemd/systemd/plain/src/systemd/sd-daemon.h"/></para>
 
                 <para><function>sd_notify()</function> and
                 <filename>sd-daemon.h</filename> files. These
                 interfaces are available as shared library, which can
                 be compiled and linked to with the
                 <filename>sd-daemon.h</filename> files. These
                 interfaces are available as shared library, which can
                 be compiled and linked to with the
-                <literal>libsystemd-daemon</literal>
-                <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+                <constant>libsystemd-daemon</constant> <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
                 file. Alternatively, applications consuming these APIs
                 may copy the implementation into their source tree. For
                 more details about the reference implementation see
                 file. Alternatively, applications consuming these APIs
                 may copy the implementation into their source tree. For
                 more details about the reference implementation see
-                <citerefentry><refentrytitle>sd_daemon</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
+                <citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
 
                 <para>If the reference implementation is used as
                 drop-in files and -DDISABLE_SYSTEMD is set during
 
                 <para>If the reference implementation is used as
                 drop-in files and -DDISABLE_SYSTEMD is set during
         <refsect1>
                 <title>Environment</title>
 
         <refsect1>
                 <title>Environment</title>
 
-                <variablelist>
+                <variablelist class='environment-variables'>
                         <varlistentry>
                                 <term><varname>$NOTIFY_SOCKET</varname></term>
 
                         <varlistentry>
                                 <term><varname>$NOTIFY_SOCKET</varname></term>
 
                 <title>See Also</title>
                 <para>
                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
                 <title>See Also</title>
                 <para>
                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
-                        <citerefentry><refentrytitle>sd_daemon</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+                        <citerefentry><refentrytitle>sd-daemon</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>daemon</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
                 </para>
                         <citerefentry><refentrytitle>daemon</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
                         <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>
                 </para>