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man: document the expanded catalogue of session classes
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<varlistentry>
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<term><varname>class=</varname></term>
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<listitem><para>Takes a string argument which sets the session class. The <varname>XDG_SESSION_CLASS</varname>
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environment variable (see below) takes precedence. One of <literal>user</literal>, <literal>greeter</literal>,
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<literal>lock-screen</literal> or <literal>background</literal>. See
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<citerefentry><refentrytitle>sd_session_get_class</refentrytitle><manvolnum>3</manvolnum></citerefentry> for
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details about the session class.</para>
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<listitem><para>Takes a string argument which sets the session class. The
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<varname>XDG_SESSION_CLASS</varname> environment variable (see below) takes precedence. See
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<citerefentry><refentrytitle>sd_session_get_class</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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for a way to query the class of a session. The following session classes are defined:</para>
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<table>
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<title>Session Classes</title>
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<tgroup cols='2' align='left' colsep='1' rowsep='1'>
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<colspec colname="name" />
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<colspec colname="explanation" />
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<thead>
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<row>
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<entry>Name</entry>
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<entry>Explanation</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><constant>user</constant></entry>
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<entry>A regular interactive user session. This is the default class for sessions for which a TTY or X display is known at session registration time.</entry>
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</row>
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<row>
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<entry><constant>user-early</constant></entry>
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<entry>Similar to <literal>user</literal> but sessions of this class are not ordered after <filename>systemd-user-sessions.service</filename>, i.e. may be started before regular sessions are allowed to be established. This session class is the default for sessions of the root user that would otherwise qualify for the <constant>user</constant> class, see above. (Added in v256.)</entry>
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</row>
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<row>
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<entry><constant>greeter</constant></entry>
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<entry>Similar to <literal>user</literal> but for sessions that are spawned by a display manager ephemerally and which prompt the user for login credentials.</entry>
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</row>
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<row>
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<entry><constant>lock-screen</constant></entry>
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<entry>Similar to <literal>user</literal> but for sessions that are spawned by a display manager ephemerally and which show a lock screen that can be used to unlock locked user accounts or sessions.</entry>
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</row>
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<row>
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<entry><constant>background</constant></entry>
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<entry>Used for background sessions, such as those invoked by <command>cron</command> and similar tools. This is the default class for sessions for which no TTY or X display is known at session registration time.</entry>
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</row>
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<row>
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<entry><constant>background-light</constant></entry>
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<entry>Similar to <constant>background</constant>, but sessions of this class will not pull in the <filename>user@.service</filename> of the user, and thus possibly have no services of the user running. (Added in v256.)</entry>
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</row>
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<row>
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<entry><constant>manager</constant></entry>
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<entry>The <filename>user@.service</filename> service of the user is registered under this session class. (Added in v256.)</entry>
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</row>
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<row>
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<entry><constant>manager-early</constant></entry>
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<entry>Similar to <constant>manager</constant>, but for the root user. Compare with the <constant>user</constant> vs. <constant>user-early</constant> situation. (Added in v256.)</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<xi:include href="version-info.xml" xpointer="v197"/></listitem>
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</varlistentry>
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@ -214,14 +214,13 @@
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<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use.</para>
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<para><function>sd_session_get_class()</function> may be used to
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determine the class of the session identified by the specified
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session identifier. The returned string is one of
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<literal>user</literal>, <literal>greeter</literal>,
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<literal>lock-screen</literal>, or <literal>background</literal>
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and needs to be freed with the libc
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<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call after use.</para>
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<para><function>sd_session_get_class()</function> may be used to determine the class of the session
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identified by the specified session identifier. The returned string is one of <literal>user</literal>,
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<literal>user-early</literal>, <literal>greeter</literal>, <literal>lock-screen</literal>,
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<literal>background</literal>, <literal>background-light</literal>, <literal>manager</literal> or
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<literal>manager-early</literal> and needs to be freed with the libc <citerefentry
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project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry> call after
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use.</para>
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<para><function>sd_session_get_desktop()</function> may be used to
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determine the brand of the desktop running on the session
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