a seat, if there is any. Returns the session
identifier and the user identifier of the Unix user
the session is belonging to. Either the session or the
- user identifier parameter can be passed NULL, in
- case only one of the parameters shall be queried. The
- returned string needs to be freed with the libc
+ user identifier parameter can be passed
+ <constant>NULL</constant>, in case only one of the
+ parameters shall be queried. The returned string needs
+ to be freed with the libc
<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
call after use.</para>