Adding upstream version 252.22.upstream/252.22upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 526 insertions, 0 deletions

diff --git a/man/sd_bus_creds_get_pid.xml b/man/sd_bus_creds_get_pid.xml
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+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="sd_bus_creds_get_pid" xmlns:xi="http://www.w3.org/2001/XInclude">
+
+  <refentryinfo>
+    <title>sd_bus_creds_get_pid</title>
+    <productname>systemd</productname>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>sd_bus_creds_get_pid</refentrytitle>
+    <manvolnum>3</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>sd_bus_creds_get_pid</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_slice</refname>
+    <refname>sd_bus_creds_get_user_unit</refname>
+    <refname>sd_bus_creds_get_user_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>
+    <refname>sd_bus_creds_has_permitted_cap</refname>
+    <refname>sd_bus_creds_has_inheritable_cap</refname>
+    <refname>sd_bus_creds_has_bounding_cap</refname>
+    <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>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_pid</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>pid_t *<parameter>pid</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_ppid</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>pid_t *<parameter>ppid</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_tid</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>pid_t *<parameter>tid</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <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>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_gid</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>gid_t *<parameter>gid</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_egid</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>gid_t *<parameter>gid</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_sgid</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>gid_t *<parameter>gid</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_fsgid</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>gid_t *<parameter>gid</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_supplementary_gids</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>const gid_t **<parameter>gids</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_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_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_exe</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>const char **<parameter>exe</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_cmdline</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>char ***<parameter>cmdline</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_cgroup</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>const char **<parameter>cgroup</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_unit</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>const char **<parameter>unit</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_slice</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>const char **<parameter>slice</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_user_unit</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>const char **<parameter>unit</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_user_slice</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>const char **<parameter>slice</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_session</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>const char **<parameter>slice</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_owner_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_has_effective_cap</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>int <parameter>capability</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_has_permitted_cap</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>int <parameter>capability</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_has_inheritable_cap</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>int <parameter>capability</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_has_bounding_cap</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>int <parameter>capability</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_selinux_context</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>const char **<parameter>context</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_audit_session_id</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <paramdef>uint32_t *<parameter>sessionid</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_audit_login_uid</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <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>
+        <paramdef>const char **<parameter>name</parameter></paramdef>
+      </funcprototype>
+
+      <funcprototype>
+        <funcdef>int <function>sd_bus_creds_get_well_known_names</function></funcdef>
+        <paramdef>sd_bus_creds *<parameter>c</parameter></paramdef>
+        <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 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 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). 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). 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_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
+    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 executable (as
+    stored in the <filename>/proc/<replaceable>pid</replaceable>/exe</filename> 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. Note that this property should not be used for more than explanatory
+    information, in particular it should not be used for security-relevant decisions. That's because the
+    executable might have been replaced or removed by the time the value can be processed. Moreover, the
+    kernel exports this information in an ambiguous way (i.e. a deleted executable cannot be safely
+    distinguished from one whose name suffix is <literal> (deleted)</literal>).</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 the control group path. See <ulink
+    url="https://docs.kernel.org/admin-guide/cgroup-v2.html">Control Groups v2</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 a part of. See
+    <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>. For
+    processes that are not part of a unit, returns -ENXIO.
+    </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 a part of. See
+    <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>. For
+    processes that are not part of a user unit, returns -ENXIO.
+    </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 a part of. See
+    <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>. Similarly,
+    <function>sd_bus_creds_get_user_slice()</function> retrieves the
+    systemd slice of the process, in the user instance of systemd.
+    </para>
+
+    <para><function>sd_bus_creds_get_session()</function> will
+    retrieve the identifier of the login session that the process is
+    a part of. Please note the login session may be limited to a stub
+    process or two.  User processes may instead be started from their
+    systemd user manager, e.g. GUI applications started using DBus
+    activation, as well as service processes which are shared between
+    multiple logins of the same user. 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 user unit or login session that the process is a part of. See
+    <citerefentry><refentrytitle>systemd-logind.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+    For processes that are not part of a user unit or session, returns
+    -ENXIO.
+    </para>
+
+    <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 it
+    was set, zero means that it was not set, and a negative return value indicates an error. See <citerefentry
+    project='man-pages'><refentrytitle>capabilities</refentrytitle><manvolnum>7</manvolnum></citerefentry> and the
+    <varname>AmbientCapabilities=</varname> and <varname>CapabilityBoundingSet=</varname> settings in
+    <citerefentry><refentrytitle>systemd.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>,
+    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>,
+    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>,
+    but will check the bounding capabilities mask.</para>
+
+    <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. Returns
+    -ENXIO for processes that are not part of an audit session.</para>
+
+    <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). Returns -ENXIO for
+    processes that are not part of an audit session.</para>
+
+    <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="https://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
+    retrieve the set of D-Bus well-known names. See <ulink
+    url="https://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 <constant>NUL</constant>-terminated string. It will be valid as long as
+    <parameter>c</parameter> remains valid, and should not be freed or
+    modified by the caller.</para>
+
+    <para>All functions that take a <parameter>char***</parameter>
+    parameter will store the answer there as an address of an array
+    of strings. Each individual string is <constant>NUL</constant>-terminated, and the
+    array is <constant>NULL</constant>-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>
+  </refsect1>
+
+  <refsect1>
+    <title>Return Value</title>
+
+    <para>On success, these calls return 0 or a positive integer. On
+    failure, these calls return a negative errno-style error code.
+    </para>
+
+    <refsect2>
+      <title>Errors</title>
+
+      <para>Returned errors may indicate the following problems:</para>
+
+      <variablelist>
+        <varlistentry>
+          <term><constant>-ENODATA</constant></term>
+
+          <listitem><para>The given field is not available in the credentials object
+          <parameter>c</parameter>.</para>
+          </listitem>
+        </varlistentry>
+
+        <varlistentry>
+          <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_creds_get_unit()</function>,
+          <function>sd_bus_creds_get_slice()</function>, <function>sd_bus_creds_get_user_unit()</function>,
+          <function>sd_bus_creds_get_user_slice()</function>, and
+          <function>sd_bus_creds_get_session()</function> if the process is not part of a systemd system
+          unit, systemd user unit, systemd slice, or logind session. It will be returned by
+          <function>sd_bus_creds_get_owner_uid()</function> if the process is not part of a systemd user unit
+          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><constant>-EINVAL</constant></term>
+
+          <listitem><para>Specified pointer parameter is <constant>NULL</constant>.</para></listitem>
+        </varlistentry>
+
+        <varlistentry>
+          <term><constant>-ENOMEM</constant></term>
+
+          <listitem><para>Memory allocation failed.</para></listitem>
+        </varlistentry>
+      </variablelist>
+    </refsect2>
+  </refsect1>
+
+  <xi:include href="libsystemd-pkgconfig.xml" />
+
+  <refsect1>
+    <title>See Also</title>
+
+    <para>
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</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.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>