+ <refsect1>
+ <title>Signals</title>
+
+ <variablelist>
+ <varlistentry>
+ <term>SIGTERM</term>
+
+ <listitem><para>Upon receiving this
+ signal the systemd system manager
+ serializes its state, reexecutes
+ itself and deserializes the saved
+ state again. This is mostly equivalent
+ to <command>systemctl
+ daemon-reexec</command>.</para>
+
+ <para>systemd session managers will
+ start the
+ <filename>exit.target</filename> unit
+ when this signal is received. This is
+ mostly equivalent to
+ <command>systemctl --session start
+ exit.target</command>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>SIGINT</term>
+
+ <listitem><para>Upon receiving this
+ signal the systemd system manager will
+ start the
+ <filename>ctrl-alt-del.target</filename> unit. This
+ is mostly equivalent to
+ <command>systemctl start
+ ctl-alt-del.target</command>.</para>
+
+ <para>systemd session managers
+ treat this signal the same way as
+ SIGTERM.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>SIGWINCH</term>
+
+ <listitem><para>When this signal is
+ received the systemd system manager
+ will start the
+ <filename>kbrequest.target</filename>
+ unit. This is mostly equivalent to
+ <command>systemctl start
+ kbrequest.target</command>.</para>
+
+ <para>This signal is ignored by
+ systemd session
+ managers.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>SIGPWR</term>
+
+ <listitem><para>When this signal is
+ received the systemd manager
+ will start the
+ <filename>sigpwr.target</filename>
+ unit. This is mostly equivalent to
+ <command>systemctl start
+ sigpwr.target</command>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>SIGUSR1</term>
+
+ <listitem><para>When this signal is
+ received the systemd manager will try
+ to reconnect to the D-Bus
+ bus.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>SIGUSR2</term>
+
+ <listitem><para>When this signal is
+ received the systemd manager will log
+ its complete state in human readable
+ form. The data logged is the same as
+ printed by <command>systemctl
+ dump</command>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>SIGHUP</term>
+
+ <listitem><para>Reloads the complete
+ daemon configuration. This is mostly
+ equivalent to <command>systemctl
+ daemon-reload</command>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>SIGRTMIN+0</term>
+
+ <listitem><para>Enters default mode, starts the
+ <filename>default.target</filename>
+ unit. This is mostly equivalent to
+ <command>systemctl start
+ default.target</command>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>SIGRTMIN+1</term>
+
+ <listitem><para>Enters rescue mode,
+ starts the
+ <filename>rescue.target</filename>
+ unit. This is mostly equivalent to
+ <command>systemctl isolate
+ rescue.target</command>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>SIGRTMIN+2</term>
+
+ <listitem><para>Enters emergency mode,
+ starts the
+ <filename>emergency.service</filename>
+ unit. This is mostly equivalent to
+ <command>systemctl isolate
+ emergency.service</command>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>SIGRTMIN+3</term>
+
+ <listitem><para>Halts the machine,
+ starts the
+ <filename>halt.target</filename>
+ unit. This is mostly equivalent to
+ <command>systemctl start
+ halt.target</command>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>SIGRTMIN+4</term>
+
+ <listitem><para>Powers off the machine,
+ starts the
+ <filename>poweroff.target</filename>
+ unit. This is mostly equivalent to
+ <command>systemctl start
+ poweroff.target</command>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>SIGRTMIN+5</term>
+
+ <listitem><para>Reboots the machine,
+ starts the
+ <filename>reboot.target</filename>
+ unit. This is mostly equivalent to
+ <command>systemctl start
+ reboot.target</command>.</para></listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>Environment</title>
+
+ <variablelist>
+ <varlistentry>
+ <term><varname>$SYSTEMD_LOG_LEVEL</varname></term>
+ <listitem><para>systemd reads the
+ log level from this environment
+ variable. This can be overridden with
+ <option>--log-level=</option>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>$SYSTEMD_LOG_TARGET</varname></term>
+ <listitem><para>systemd reads the
+ log target from this environment
+ variable. This can be overridden with
+ <option>--log-target=</option>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>$SYSTEMD_LOG_COLOR</varname></term>
+ <listitem><para>Controls whether
+ systemd highlights important log
+ messages. This can be overridden with
+ <option>--log-color=</option>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>$SYSTEMD_LOG_LOCATION</varname></term>
+ <listitem><para>Controls whether
+ systemd prints the code location along
+ with log messages. This can be
+ overridden with
+ <option>--log-location=</option>.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>$XDG_CONFIG_HOME</varname></term>
+ <term><varname>$XDG_CONFIG_DIRS</varname></term>
+ <term><varname>$XDG_DATA_HOME</varname></term>
+ <term><varname>$XDG_DATA_DIRS</varname></term>
+
+ <listitem><para>The systemd session
+ manager uses these variables in
+ accordance to the <ulink
+ url="http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html">XDG
+ Base Directory specification</ulink>
+ to find its configuration.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>$SYSTEMD_UNIT_PATH</varname></term>
+
+ <listitem><para>Controls where systemd
+ looks for unit
+ files.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>$SYSTEMD_SYSVINIT_PATH</varname></term>
+
+ <listitem><para>Controls where systemd
+ looks for SysV init scripts.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>$SYSTEMD_SYSVRCND_PATH</varname></term>
+
+ <listitem><para>Controls where systemd
+ looks for SysV init script runlevel link
+ farms.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>$LISTEN_PID</varname></term>
+ <term><varname>$LISTEN_FDS</varname></term>
+
+ <listitem><para>Set by systemd for
+ supervised processes during
+ socket-based activation. See
+ <citerefentry><refentrytitle>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ for more information.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>$NOTIFY_SOCKET</varname></term>
+
+ <listitem><para>Set by systemd for
+ supervised processes for status and
+ start-up completion notification. See
+ <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ for more information.
+ </para></listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1>
+ <title>Sockets and FIFOs</title>
+
+ <variablelist>
+ <varlistentry>
+ <term><filename>@/org/freedesktop/systemd1/notify</filename></term>
+
+ <listitem><para>Daemon status
+ notification socket. This is an AF_UNIX
+ datagram socket in the Linux abstract
+ namespace, and is used to implement
+ the daemon notification logic as
+ implemented by
+ <citerefentry><refentrytitle>sd_notify</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem>
+
+ </varlistentry>
+
+ <varlistentry>
+ <term><filename>@/org/freedesktop/systemd1/logger</filename></term>
+
+ <listitem><para>Used internally by the
+ <filename>systemd-logger.service</filename>
+ unit to connect STDOUT and/or STDERR
+ of spawned processes to
+ <citerefentry><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ or the kernel log buffer. This is an
+ AF_UNIX stream socket in the Linux
+ abstract namespace.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><filename>@/org/freedesktop/systemd1/private</filename></term>
+
+ <listitem><para>Used internally as
+ communication channel between
+ <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+ and the systemd process. This is an
+ AF_UNIX stream socket in the Linux
+ abstract namespace. This interface is
+ private to systemd and should not be
+ used in external
+ projects.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><filename>/dev/initctl</filename></term>
+
+ <listitem><para>Limited compatibility
+ support for the SysV client interface,
+ as implemented by the
+ <filename>systemd-initctl.service</filename>
+ unit. This is a named pipe in the file
+ system. This interface is obsolete and
+ should not be used in new
+ applications.</para></listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
~ianmdlvl / elogind.git / blobdiff