+
+ <para><function>sd_pid_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>If the <varname>pid</varname> parameter of any
+ of these functions is passed as 0 the operation is
+ executed for the calling process.</para>