<para><function>sd_get_seats()</function> may be used
to determine all currently available local
- seats. Returns a NULL terminated array of seat
+ seats. Returns a <constant>NULL</constant> terminated array of seat
identifiers. The returned array and all strings it
references need to be freed with the libc
<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
call after use. Note that instead of an empty array
- NULL may be returned and should be considered
+ <constant>NULL</constant> may be returned and should be considered
equivalent to an empty array.</para>
<para>Similar, <function>sd_get_sessions()</function> may
<function>sd_get_machine_names()</function> interfaces
are available as shared library, which can be compiled
and linked to with the
- <literal>libsystemd-login</literal>
- <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ <constant>libsystemd-login</constant> <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
file.</para>
</refsect1>