chiark / gitweb /
Merge patches from Hleb Valoshka
[elogind.git] / man / sd_bus_creds_get_pid.xml
index 5a848576f3a87c3e113c9371112df410a6a17c94..ffc526ea6effc12dfe37e93d45d4cf776ba7dde7 100644 (file)
@@ -1,31 +1,31 @@
-<?xml version='1.0'?> <!--*-nxml-*-->
+<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
 <!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.
+  This file is part of elogind.
 
-Copyright 2014 Zbigniew Jędrzejewski-Szmek
+  Copyright 2014 Zbigniew Jędrzejewski-Szmek
 
-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.
+  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
-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.
+  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/>.
+  You should have received a copy of the GNU Lesser General Public License
+  along with elogind; If not, see <http://www.gnu.org/licenses/>.
 -->
 
-<refentry id="sd_bus_creds_get_pid" conditional="ENABLE_KDBUS">
+<refentry id="sd_bus_creds_get_pid">
 
   <refentryinfo>
     <title>sd_bus_creds_get_pid</title>
-    <productname>systemd</productname>
+    <productname>elogind</productname>
 
     <authorgroup>
       <author>
@@ -44,18 +44,22 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
 
   <refnamediv>
     <refname>sd_bus_creds_get_pid</refname>
-    <refname>sd_bus_creds_get_pid_starttime</refname>
+    <refname>sd_bus_creds_get_ppid</refname>
     <refname>sd_bus_creds_get_tid</refname>
     <refname>sd_bus_creds_get_uid</refname>
+    <refname>sd_bus_creds_get_euid</refname>
+    <refname>sd_bus_creds_get_suid</refname>
+    <refname>sd_bus_creds_get_fsuid</refname>
     <refname>sd_bus_creds_get_gid</refname>
+    <refname>sd_bus_creds_get_egid</refname>
+    <refname>sd_bus_creds_get_sgid</refname>
+    <refname>sd_bus_creds_get_fsgid</refname>
+    <refname>sd_bus_creds_get_supplementary_gids</refname>
     <refname>sd_bus_creds_get_comm</refname>
     <refname>sd_bus_creds_get_tid_comm</refname>
     <refname>sd_bus_creds_get_exe</refname>
     <refname>sd_bus_creds_get_cmdline</refname>
     <refname>sd_bus_creds_get_cgroup</refname>
-    <refname>sd_bus_creds_get_unit</refname>
-    <refname>sd_bus_creds_get_user_unit</refname>
-    <refname>sd_bus_creds_get_slice</refname>
     <refname>sd_bus_creds_get_session</refname>
     <refname>sd_bus_creds_get_owner_uid</refname>
     <refname>sd_bus_creds_has_effective_cap</refname>
@@ -65,15 +69,17 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
     <refname>sd_bus_creds_get_selinux_context</refname>
     <refname>sd_bus_creds_get_audit_session_id</refname>
     <refname>sd_bus_creds_get_audit_login_uid</refname>
+    <refname>sd_bus_creds_get_tty</refname>
     <refname>sd_bus_creds_get_unique_name</refname>
     <refname>sd_bus_creds_get_well_known_names</refname>
+    <refname>sd_bus_creds_get_description</refname>
 
     <refpurpose>Retrieve fields from a credentials object</refpurpose>
   </refnamediv>
 
   <refsynopsisdiv>
     <funcsynopsis>
-      <funcsynopsisinfo>#include &lt;systemd/sd-bus.h&gt;</funcsynopsisinfo>
+      <funcsynopsisinfo>#include &lt;elogind/sd-bus.h&gt;</funcsynopsisinfo>
 
       <funcprototype>
         <funcdef>int <function>sd_bus_creds_get_pid</function></funcdef>
@@ -82,9 +88,9 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
       </funcprototype>
 
       <funcprototype>
-        <funcdef>int <function>sd_bus_creds_get_pid_starttime</function></funcdef>
+        <funcdef>int <function>sd_bus_creds_get_ppid</function></funcdef>
         <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
-        <paramdef>uint64_t *<parameter>usec</parameter></paramdef>
+        <paramdef>pid_t *<parameter>ppid</parameter></paramdef>
       </funcprototype>
 
       <funcprototype>
@@ -94,7 +100,25 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
       </funcprototype>
 
       <funcprototype>
-        <funcdef>int <function>sd_bus_creds_get_pid</function></funcdef>
+        <funcdef>int <function>sd_bus_creds_get_uid</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>uid_t *<parameter>uid</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_euid</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>uid_t *<parameter>uid</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_suid</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>uid_t *<parameter>uid</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_fsuid</function></funcdef>
         <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
         <paramdef>uid_t *<parameter>uid</parameter></paramdef>
       </funcprototype>
@@ -106,51 +130,57 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
       </funcprototype>
 
       <funcprototype>
-        <funcdef>int <function>sd_bus_creds_get_comm</function></funcdef>
+        <funcdef>int <function>sd_bus_creds_get_egid</function></funcdef>
         <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
-        <paramdef>const char **<parameter>comm</parameter></paramdef>
+        <paramdef>gid_t *<parameter>gid</parameter></paramdef>
       </funcprototype>
 
       <funcprototype>
-        <funcdef>int <function>sd_bus_creds_get_tid_comm</function></funcdef>
+        <funcdef>int <function>sd_bus_creds_get_sgid</function></funcdef>
         <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
-        <paramdef>const char **<parameter>comm</parameter></paramdef>
+        <paramdef>gid_t *<parameter>gid</parameter></paramdef>
       </funcprototype>
 
       <funcprototype>
-        <funcdef>int <function>sd_bus_creds_get_exe</function></funcdef>
+        <funcdef>int <function>sd_bus_creds_get_fsgid</function></funcdef>
         <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
-        <paramdef>const char **<parameter>exe</parameter></paramdef>
+        <paramdef>gid_t *<parameter>gid</parameter></paramdef>
       </funcprototype>
 
       <funcprototype>
-        <funcdef>int <function>sd_bus_creds_get_cmdline</function></funcdef>
+        <funcdef>int <function>sd_bus_creds_get_supplementary_gids</function></funcdef>
         <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
-        <paramdef>char ***<parameter>cmdline</parameter></paramdef>
+        <paramdef>const gid_t **<parameter>gids</parameter></paramdef>
       </funcprototype>
 
       <funcprototype>
-        <funcdef>int <function>sd_bus_creds_get_cgroup</function></funcdef>
+        <funcdef>int <function>sd_bus_creds_get_comm</function></funcdef>
         <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
-        <paramdef>const char **<parameter>cgroup</parameter></paramdef>
+        <paramdef>const char **<parameter>comm</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_tid_comm</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>const char **<parameter>comm</parameter></paramdef>
       </funcprototype>
 
       <funcprototype>
-        <funcdef>int <function>sd_bus_creds_get_unit</function></funcdef>
+        <funcdef>int <function>sd_bus_creds_get_exe</function></funcdef>
         <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
-        <paramdef>const char **<parameter>unit</parameter></paramdef>
+        <paramdef>const char **<parameter>exe</parameter></paramdef>
       </funcprototype>
 
       <funcprototype>
-        <funcdef>int <function>sd_bus_creds_get_user_unit</function></funcdef>
+        <funcdef>int <function>sd_bus_creds_get_cmdline</function></funcdef>
         <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
-        <paramdef>const char **<parameter>unit</parameter></paramdef>
+        <paramdef>char ***<parameter>cmdline</parameter></paramdef>
       </funcprototype>
 
       <funcprototype>
-        <funcdef>int <function>sd_bus_creds_get_slice</function></funcdef>
+        <funcdef>int <function>sd_bus_creds_get_cgroup</function></funcdef>
         <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
-        <paramdef>const char **<parameter>slice</parameter></paramdef>
+        <paramdef>const char **<parameter>cgroup</parameter></paramdef>
       </funcprototype>
 
       <funcprototype>
@@ -207,6 +237,12 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
         <paramdef>uid_t *<parameter>loginuid</parameter></paramdef>
       </funcprototype>
 
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_tty</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>const char **<parameter>tty</parameter></paramdef>
+      </funcprototype>
+
       <funcprototype>
         <funcdef>int <function>sd_bus_creds_get_unique_name</function></funcdef>
         <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
@@ -219,139 +255,164 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
         <paramdef>char ***<parameter>name</parameter></paramdef>
       </funcprototype>
 
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_description</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>const char **<parameter>name</parameter></paramdef>
+      </funcprototype>
+
     </funcsynopsis>
   </refsynopsisdiv>
 
   <refsect1>
     <title>Description</title>
 
-    <para>These functions return information from an
-    <parameter>sd_bus_creds</parameter> object. It may be created with
+    <para>These functions return credential information from an
+    <parameter>sd_bus_creds</parameter> object. Credential objects may
+    be created with
     <citerefentry><refentrytitle>sd_bus_creds_new_from_pid</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
-    in which case it will describe the specified process, or it may be
-    created by
-    <citerefentry><refentrytitle>sd_bus_get_peer_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
-    in which case it will describe the process at the other endpoint
-    of a connection.
-    </para>
-
-    <para><function>sd_bus_creds_get_pid</function> will retrieve the
-    PID (process identifier).</para>
-
-    <para><function>sd_bus_creds_get_pid_starttime</function> will
-    retrieve the time since the start of the epoch in microseconds
-    since the process was started.</para>
-
-    <para><function>sd_bus_creds_get_tid</function> will retrieve the
+    in which case they describe the credentials of the process
+    identified by the specified PID, with
+    <citerefentry><refentrytitle>sd_bus_get_name_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+    in which case they describe the credentials of a bus peer
+    identified by the specified bus name, with
+    <citerefentry><refentrytitle>sd_bus_get_owner_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+    in which case they describe the credentials of the creator of a
+    bus, or with
+    <citerefentry><refentrytitle>sd_bus_message_get_creds</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
+    in which case they describe the credentials of the sender of the
+    message.</para>
+
+    <para>Not all credential fields are part of every
+    <literal>sd_bus_creds</literal> object. Use
+    <citerefentry><refentrytitle>sd_bus_creds_get_mask</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    to determine the mask of fields available.</para>
+
+    <para><function>sd_bus_creds_get_pid()</function> will retrieve
+    the PID (process identifier). Similarly,
+    <function>sd_bus_creds_get_ppid()</function> will retrieve the
+    parent PID. Note that PID 1 has no parent process, in which case
+    -ENXIO is returned.</para>
+
+    <para><function>sd_bus_creds_get_tid()</function> will retrieve the
     TID (thread identifier).</para>
 
-    <para><function>sd_bus_creds_get_uid</function> will retrieve the
-    numeric UID (user identifier).</para>
+    <para><function>sd_bus_creds_get_uid()</function> will retrieve
+    the numeric UID (user identifier). Similarly,
+    <function>sd_bus_creds_get_euid()</function> returns the effective
+    UID, <function>sd_bus_creds_get_suid()</function> the saved UID
+    and <function>sd_bus_creds_get_fsuid()</function> the file system
+    UID.</para>
 
-    <para><function>sd_bus_creds_get_gid</function> will retrieve the
-    numeric GID (group identifier).</para>
+    <para><function>sd_bus_creds_get_gid()</function> will retrieve the
+    numeric GID (group identifier). Similarly,
+    <function>sd_bus_creds_get_egid()</function> returns the effective
+    GID, <function>sd_bus_creds_get_sgid()</function> the saved GID
+    and <function>sd_bus_creds_get_fsgid()</function> the file system
+    GID.</para>
 
-    <para><function>sd_bus_creds_get_comm</function> will retrieve the
+    <para><function>sd_bus_creds_get_supplementary_gids()</function>
+    will retrieve the supplementary GIDs list.</para>
+
+    <para><function>sd_bus_creds_get_comm()</function> will retrieve the
     comm field (truncated name of the executable, as stored in
     <filename>/proc/<replaceable>pid</replaceable>/comm</filename>).
     </para>
 
-    <para><function>sd_bus_creds_get_tid_comm</function> will retrieve
+    <para><function>sd_bus_creds_get_tid_comm()</function> will retrieve
     the comm field of the thread (as stored in
     <filename>/proc/<replaceable>pid</replaceable>/task/<replaceable>tid</replaceable>/comm</filename>).
     </para>
 
-    <para><function>sd_bus_creds_get_exe</function> will retrieve the
-    path to the program (as stored in the
+    <para><function>sd_bus_creds_get_exe()</function> will retrieve
+    the path to the program executable (as stored in the
     <filename>/proc/<replaceable>pid</replaceable>/exe</filename>
-    link, but with <literal> (deleted)</literal> suffix removed).
-    </para>
+    link, but with the <literal> (deleted)</literal> suffix removed). Note
+    that kernel threads do not have an executable path, in which case
+    -ENXIO is returned.</para>
 
-    <para><function>sd_bus_creds_get_cmdline</function> will retrieve
-    an array of command-line arguments (as stored in
-    <filename>/proc/<replaceable>pid</replaceable>/cmdline</filename>).
-    </para>
+    <para><function>sd_bus_creds_get_cmdline()</function> will
+    retrieve an array of command line arguments (as stored in
+    <filename>/proc/<replaceable>pid</replaceable>/cmdline</filename>). Note
+    that kernel threads do not have a command line, in which case
+    -ENXIO is returned.</para>
 
-    <para><function>sd_bus_creds_get_cgroup</function> will retrieve
+    <para><function>sd_bus_creds_get_cgroup()</function> will retrieve
     the cgroup path. See <ulink
     url="https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt">cgroups.txt</ulink>.
     </para>
 
-    <para><function>sd_bus_creds_get_unit</function> will retrieve the
-    systemd unit name (in the system instance of systemd) that the
-    process is part of. See
-    <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
-    </para>
-
-    <para><function>sd_bus_creds_get_user_unit</function> will
-    retrieve the systemd unit name (in the user instance of systemd)
-    that the process is part of. See
-    <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
-    </para>
-
-    <para><function>sd_bus_creds_get_slice</function> will retrieve
-    the systemd slice (a unit in the system instance of systemd) that
-    the process is part of. See
-    <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
-    </para>
-
-    <para><function>sd_bus_creds_get_session</function> will retrieve
-    the logind session that the process is part of. See
-    <citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+    <para><function>sd_bus_creds_get_session()</function> will
+    retrieve the identifier of the login session that the process is
+    a part of. See
+    <citerefentry><refentrytitle>elogind-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>. For
+    processes that are not part of a session, returns -ENXIO.
     </para>
 
-    <para><function>sd_bus_creds_get_owner_uid</function> will retrieve
-    the numeric UID (user identifier) of the user who owns the slice
-    that the process is part of. See
-    <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>
-    <!-- and
-    <citerefentry><refentrytitle>systemd-user-sessions.service</refentrytitle><manvolnum>8</manvolnum></citerefentry> -->.
+    <para><function>sd_bus_creds_get_owner_uid()</function> will
+    retrieve the numeric UID (user identifier) of the user who owns
+    the login session that the process is a part of. See
+    <citerefentry><refentrytitle>elogind-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+    For processes that are not part of a session, returns -ENXIO.
     </para>
 
-    <para><function>sd_bus_creds_has_effective_cap</function> will
+    <para><function>sd_bus_creds_has_effective_cap()</function> will
     check whether the capability specified by
     <parameter>capability</parameter> was set in the effective
     capabilities mask. A positive return value means that is was
     set, zero means that it was not set, and a negative return
-    value signifies an error. See
+    value indicates an error. See
     <citerefentry project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry>
     and <varname>Capabilities=</varname> and
     <varname>CapabilityBoundingSet=</varname> settings in
-    <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+    <citerefentry><refentrytitle>elogind.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
     </para>
 
-    <para><function>sd_bus_creds_has_permitted_cap</function> is
-    similar to <function>sd_bus_creds_has_effective_cap</function>,
+    <para><function>sd_bus_creds_has_permitted_cap()</function> is
+    similar to <function>sd_bus_creds_has_effective_cap()</function>,
     but will check the permitted capabilities mask.</para>
 
-    <para><function>sd_bus_creds_has_inheritable_cap</function> is
-    similar to <function>sd_bus_creds_has_effective_cap</function>,
+    <para><function>sd_bus_creds_has_inheritable_cap()</function> is
+    similar to <function>sd_bus_creds_has_effective_cap()</function>,
     but will check the inheritable capabilities mask.</para>
 
-    <para><function>sd_bus_creds_has_bounding_cap</function> is
-    similar to <function>sd_bus_creds_has_effective_cap</function>,
+    <para><function>sd_bus_creds_has_bounding_cap()</function> is
+    similar to <function>sd_bus_creds_has_effective_cap()</function>,
     but will check the bounding capabilities mask.</para>
 
-    <para><function>sd_bus_creds_get_selinux_context</function> will
+    <para><function>sd_bus_creds_get_selinux_context()</function> will
     retrieve the SELinux security context (label) of the process.</para>
 
-    <para><function>sd_bus_creds_get_audit_session_id</function> will
-    retrieve the audit session identifier of the process.</para>
+    <para><function>sd_bus_creds_get_audit_session_id()</function>
+    will retrieve the audit session identifier of the process. Returns
+    -ENXIO for processes that are not part of an audit session.</para>
 
-    <para><function>sd_bus_creds_get_audit_login_uid</function> will
+    <para><function>sd_bus_creds_get_audit_login_uid()</function> will
     retrieve the audit user login identifier (the identifier of the
-    user who is "responsible" for the session).</para>
+    user who is "responsible" for the session). Returns -ENXIO for
+    processes that are not part of an audit session.</para>
 
-    <para><function>sd_bus_creds_get_unique_name</function> will
+    <para><function>sd_bus_creds_get_tty()</function> will retrieve
+    the controlling TTY, without the prefixing "/dev/". Returns -ENXIO
+    for processes that have no controlling TTY.</para>
+
+    <para><function>sd_bus_creds_get_unique_name()</function> will
     retrieve the D-Bus unique name. See <ulink
     url="http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-bus">The
     D-Bus specification</ulink>.</para>
 
-    <para><function>sd_bus_creds_get_well_known_names</function> will
+    <para><function>sd_bus_creds_get_well_known_names()</function> will
     retrieve the set of D-Bus well-known names. See <ulink
     url="http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-bus">The
     D-Bus specification</ulink>.</para>
 
+    <para><function>sd_bus_creds_get_description()</function> will
+    retrieve a descriptive name of the bus connection of the
+    peer. This name is useful to discern multiple bus connections by
+    the same peer, and may be altered by the peer with the
+    <citerefentry><refentrytitle>sd_bus_set_description</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+    call.</para>
+
     <para>All functions that take a <parameter>const
     char**</parameter> parameter will store the answer there as an
     address of a NUL-terminated string. It will be valid as long as
@@ -359,8 +420,8 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
     modified by the caller.</para>
 
     <para>All functions that take a <parameter>char***</parameter>
-    parameter will store the answer there as an address of a an array
-    of strings. Each invidividual string is NUL-terminated, and the
+    parameter will store the answer there as an address of an array
+    of strings. Each individual string is NUL-terminated, and the
     array is NULL-terminated as a whole. It will be valid as long as
     <parameter>c</parameter> remains valid, and should not be freed or
     modified by the caller.</para>
@@ -381,44 +442,44 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
 
     <variablelist>
       <varlistentry>
-        <term><varname>-ENODATA</varname></term>
+        <term><constant>-ENODATA</constant></term>
 
-        <listitem><para>Given field is not available in
-        <parameter>c</parameter>.</para>
+        <listitem><para>The given field is not available in the
+        credentials object <parameter>c</parameter>.</para>
         </listitem>
       </varlistentry>
 
       <varlistentry>
-        <term><varname>-ENOENT</varname></term>
-
-        <listitem><para>Given field is not specified for the sender.
-        This will be returned by <function>sd_bus_get_unit</function>,
-        <function>sd_bus_get_user_unit</function>,
-        <function>sd_bus_get_slice</function>,
-        <function>sd_bus_get_session</function>, and
-        <function>sd_bus_get_owner_uid</function> if the sender is not
-        part of a systemd system unit, systemd user unit, systemd
-        slice, logind session, or a systemd user session.</para>
+        <term><constant>-ENXIO</constant></term>
+
+        <listitem><para>The given field is not specified for the described
+        process or peer. This will be returned by
+        <function>sd_bus_get_session()</function>, and
+        <function>sd_bus_get_owner_uid()</function> if the process is
+        not part of a elogind system unit, systemd user unit, systemd
+        slice, or logind session. It will also be returned by
+        <function>sd_bus_creds_get_exe()</function> and
+        <function>sd_bus_creds_get_cmdline()</function> for kernel
+        threads (since these are not started from an executable binary,
+        nor have a command line), and by
+        <function>sd_bus_creds_get_audit_session_id()</function> and
+        <function>sd_bus_creds_get_audit_login_uid()</function> when
+        the process is not part of an audit session, and
+        <function>sd_bus_creds_get_tty()</function> if the process has
+        no controlling TTY.
+        </para>
         </listitem>
       </varlistentry>
 
       <varlistentry>
-        <term><varname>-ENXIO</varname></term>
-
-        <listitem><para>An error occured in parsing cgroup paths.
-        <filename>libsystemd</filename> might be out of sync with
-        the running systemd version.</para></listitem>
-      </varlistentry>
-
-      <varlistentry>
-        <term><varname>-EINVAL</varname></term>
+        <term><constant>-EINVAL</constant></term>
 
         <listitem><para>Specified pointer parameter is <constant>NULL</constant>.
         </para></listitem>
       </varlistentry>
 
       <varlistentry>
-        <term><varname>-ENOMEM</varname></term>
+        <term><constant>-ENOMEM</constant></term>
 
         <listitem><para>Memory allocation failed.</para></listitem>
       </varlistentry>
@@ -428,10 +489,11 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
   <refsect1>
     <title>Notes</title>
 
-    <para><function>sd_bus_open_user()</function> and other functions
-    described here are available as a shared library, which can be
-    compiled and linked to with the
-    <constant>libsystemd</constant> <citerefentry project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+    <para><function>sd_bus_creds_get_pid()</function> and the other
+    functions described here are available as a shared library, which
+    can be compiled and linked to with the
+    <constant>libelogind</constant> <citerefentry
+    project='die-net'><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
     file.</para>
   </refsect1>
 
@@ -439,14 +501,15 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>.
     <title>See Also</title>
 
     <para>
-      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>elogind</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
       <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
-      <citerefentry><refentrytitle>fork</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
-      <citerefentry><refentrytitle>execve</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd_bus_creds_new_from_pid</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>fork</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>execve</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
       <citerefentry project='man-pages'><refentrytitle>credentials</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
       <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
       <citerefentry project='man-pages'><refentrytitle>proc</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
-      <citerefentry><refentrytitle>systemd.journald-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>
+      <citerefentry><refentrytitle>elogind.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>
     </para>
   </refsect1>