+
+ <para><function>sd_session_get_service()</function>
+ may be used to determine the name of the service (as
+ passed during PAM session setup) that registered the
+ session identified by the specified session
+ identifier. 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_session_get_type()</function> may
+ be used to determine the type of the session
+ identified by the specified session identifier. The
+ returned string is one of <literal>x11</literal>,
+ <literal>tty</literal> or
+ <literal>unspecified</literal> and needs to be freed
+ with the libc
+ <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ call after use.</para>
+
+ <para><function>sd_session_get_class()</function> may
+ be used to determine the class of the session
+ identified by the specified session identifier. The
+ returned string is one of <literal>user</literal>,
+ <literal>greeter</literal>,
+ <literal>lock-screen</literal>, or
+ <literal>background</literal> and needs to be freed
+ with the libc
+ <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ call after use.</para>
+
+ <para><function>sd_session_get_display()</function>
+ may be used to determine the X11 display of the
+ session identified by the specified session
+ identifier. 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_session_get_tty()</function>
+ may be used to determine the TTY device of the
+ session identified by the specified session
+ identifier. 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>session</varname> parameter of
+ any of these functions is passed as
+ <constant>NULL</constant> the operation is executed
+ for the session the calling process is a member of, if
+ there is any.</para>