<varlistentry>
<term><varname>$LISTEN_FDS</varname></term>
<term><varname>$LISTEN_PID</varname></term>
+ <term><varname>$LISTEN_FDNAMES</varname></term>
<listitem><para>Information about file descriptors passed to a
service for socket activation. See
</varlistentry>
<varlistentry>
+ <term><varname>$NOTIFY_SOCKET</varname></term>
+
+ <listitem><para>The socket
+ <function>sd_notify()</function> talks to. See
+ <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>$WATCHDOG_PID</varname></term>
+ <term><varname>$WATCHDOG_USEC</varname></term>
+
+ <listitem><para>Information about watchdog keep-alive notifications. See
+ <citerefentry><refentrytitle>sd_watchdog_enabled</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
<term><varname>$TERM</varname></term>
<listitem><para>Terminal type, set only for units connected to
<para>Additional variables may be configured by the following
means: for processes spawned in specific units, use the
- <varname>Environment=</varname> and
- <varname>EnvironmentFile=</varname> options above; to specify
+ <varname>Environment=</varname>, <varname>EnvironmentFile=</varname>
+ and <varname>PassEnvironment=</varname> options above; to specify
variables globally, use <varname>DefaultEnvironment=</varname>
(see
<citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>)