currently active (> 0), where the user is currently
online but possibly inactive (= 0), or
logged in at all but possibly closing the session (< 0). The call returns a
- NULL terminated string array of session identifiers in
+ <constant>NULL</constant> terminated string array of session identifiers in
<parameter>sessions</parameter> which needs to be
freed by the caller with the libc
<citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
call after use, including all the strings
referenced. If the string array parameter is passed as
- NULL the array will not be filled in, but the return
+ <constant>NULL</constant> the array will not be filled in, but the return
code still indicates the number of current
- sessions. Note that instead of an empty array NULL may
+ sessions. Note that instead of an empty array <constant>NULL</constant> may
be returned and should be considered equivalent to an
empty array.</para>
<function>sd_uid_get_sessions()</function>, and
<function>sd_uid_get_seats()</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>
+ linked to with the <constant>libsystemd-login</constant> <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
file.</para>
</refsect1>