+ <para><function>sd_pid_get_machine_name()</function>
+ may be used to determine the name of the VM or
+ container is a member of. The machine name is a short
+ string, suitable for usage in file system paths. The
+ returned string needs to be freed with the libc
+ <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ call after use.</para>
+
+ <para><function>sd_pid_get_slice()</function> may be
+ used to determine the slice unit the process is a
+ member of. See
+ <citerefentry><refentrytitle>systemd.slice</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for details about slices. The returned string needs to
+ be freed with the libc
+ <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ call after use.</para>
+
+ <para>If the <varname>pid</varname> parameter of any