core: add "invocation ID" concept to service manager

[elogind.git] / man / sd_id128_get_machine.xml

diff --git a/man/sd_id128_get_machine.xml b/man/sd_id128_get_machine.xml
index 2ad1f8f728b3b54c8820b6e0c81d6a1e644467fd..cd6c39032c497b8995bd705dda38cf4b0b07f243 100644 (file)
--- a/man/sd_id128_get_machine.xml
+++ b/man/sd_id128_get_machine.xml
@@ -3,29 +3,29 @@
   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
 
 <!--
-  This file is part of systemd.
+  This file is part of elogind.
 
   Copyright 2012 Lennart Poettering
 
-  systemd is free software; you can redistribute it and/or modify it
+  elogind 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
+  elogind 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/>.
+  along with elogind; If not, see <http://www.gnu.org/licenses/>.
 -->
 
 <refentry id="sd_id128_get_machine">
 
   <refentryinfo>
     <title>sd_id128_get_machine</title>
-    <productname>systemd</productname>
+    <productname>elogind</productname>
 
     <authorgroup>
       <author>
@@ -45,12 +45,13 @@
   <refnamediv>
     <refname>sd_id128_get_machine</refname>
     <refname>sd_id128_get_boot</refname>
+    <refname>sd_id128_get_invocation</refname>
     <refpurpose>Retrieve 128-bit IDs</refpurpose>
   </refnamediv>
 
   <refsynopsisdiv>
     <funcsynopsis>
-      <funcsynopsisinfo>#include &lt;systemd/sd-id128.h&gt;</funcsynopsisinfo>
+      <funcsynopsisinfo>#include &lt;elogind/sd-id128.h&gt;</funcsynopsisinfo>
 
       <funcprototype>
         <funcdef>int <function>sd_id128_get_machine</function></funcdef>
@@ -62,6 +63,11 @@
         <paramdef>sd_id128_t *<parameter>ret</parameter></paramdef>
       </funcprototype>
 
+      <funcprototype>
+        <funcdef>int <function>sd_id128_get_invocation</function></funcdef>
+        <paramdef>sd_id128_t *<parameter>ret</parameter></paramdef>
+      </funcprototype>
+
     </funcsynopsis>
   </refsynopsisdiv>
 
@@ -83,11 +89,15 @@
     for more information. This function also internally caches the
     returned ID to make this call a cheap operation.</para>
 
-    <para>Note that <function>sd_id128_get_boot()</function> always
-    returns a UUID v4 compatible ID.
-    <function>sd_id128_get_machine()</function> will also return a
-    UUID v4-compatible ID on new installations but might not on older.
-    It is possible to convert the machine ID into a UUID v4-compatible
+    <para><function>sd_id128_get_invocation()</function> returns the invocation ID of the currently executed
+    service. In its current implementation, this reads and parses the <varname>$INVOCATION_ID</varname> environment
+    variable that the service manager sets when activating a service, see
+    <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details. The
+    ID is cached internally. In future a different mechanism to determine the invocation ID may be added.</para>
+
+    <para>Note that <function>sd_id128_get_boot()</function> and <function>sd_id128_get_invocation()</function> always
+    return UUID v4 compatible IDs.  <function>sd_id128_get_machine()</function> will also return a UUID v4-compatible
+    ID on new installations but might not on older.  It is possible to convert the machine ID into a UUID v4-compatible
     one. For more information, see
     <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
 
@@ -107,11 +117,10 @@
   <refsect1>
     <title>Notes</title>
 
-    <para>The <function>sd_id128_get_machine()</function> and
-    <function>sd_id128_get_boot()</function> interfaces are available
-    as a shared library, which can be compiled and linked to with the
-    <literal>libsystemd</literal> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
-    file.</para>
+    <para>The <function>sd_id128_get_machine()</function>, <function>sd_id128_get_boot()</function> and
+    <function>sd_id128_get_invocation()</function> interfaces are available as a shared library, which can be compiled
+    and linked to with the <literal>libsystemd</literal> <citerefentry
+    project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry> file.</para>
   </refsect1>
 
   <refsect1>
@@ -121,8 +130,9 @@
       <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
-      <citerefentry><refentrytitle>random</refentrytitle><manvolnum>4</manvolnum></citerefentry>,
-      <citerefentry><refentrytitle>sd_id128_randomize</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+      <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd_id128_randomize</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>random</refentrytitle><manvolnum>4</manvolnum></citerefentry>
     </para>
   </refsect1>