Updated inittab example documentation

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 30 insertions, 17 deletions

diff --git a/examples/inittab b/examples/inittab
index 01ceaef25..4761aa19c 100644
--- a/examples/inittab
+++ b/examples/inittab
@@ -19,30 +19,43 @@
 #
 # <runlevels>: The runlevels field is completely ignored.
 #
-# <action>: Valid actions include: sysinit, respawn, askfirst, wait, once,
-#                                  restart, ctrlaltdel, and shutdown.
+# <action>: Valid actions include: sysinit, wait, once, respawn, askfirst,
+#                                  shutdown, restart and ctrlaltdel.
 #
-#       Note: askfirst acts just like respawn, but before running the specified
-#       process it displays the line "Please press Enter to activate this
-#       console." and then waits for the user to press enter before starting
-#       the specified process.
+#       sysinit actions are started first, and init waits for them to complete.
+#       wait actions are started next, and init waits for them to complete.
+#       once actions are started next (and not waited for).
 #
-#       Note: unrecognized actions (like initdefault) will cause init to emit
-#       an error message, and then go along with its business.
+#       askfirst and respawn are started next.
+#       For askfirst, before running the specified process, init displays
+#       the line "Please press Enter to activate this console"
+#       and then waits for the user to press enter before starting it.
+#
+#       shutdown actions are run on halt/reboot/poweroff, or on SIGQUIT.
+#       Then the machine is halted/rebooted/powered off, or for SIGQUIT,
+#       restart action is exec'ed (init process is replaced by that process).
+#       If no restart action specified, SIGQUIT has no effect.
+#
+#       ctrlaltdel actions are run when SIGINT is received
+#       (this might be initiated by Ctrl-Alt-Del key combination).
+#       After they complete, normal processing of askfirst / respawn resumes.
+#
+#       Note: unrecognized actions (like initdefault) will cause init to emit
+#       an error message, and then go along with its business.
 #
 # <process>: Specifies the process to be executed and it's command line.
 #
 # Note: BusyBox init works just fine without an inittab. If no inittab is
 # found, it has the following default behavior:
-#         ::sysinit:/etc/init.d/rcS
-#         ::askfirst:/bin/sh
-#         ::ctrlaltdel:/sbin/reboot
-#         ::shutdown:/sbin/swapoff -a
-#         ::shutdown:/bin/umount -a -r
-#         ::restart:/sbin/init
-#         tty2::askfirst:/bin/sh
-#         tty3::askfirst:/bin/sh
-#         tty4::askfirst:/bin/sh
+#       ::sysinit:/etc/init.d/rcS
+#       ::askfirst:/bin/sh
+#       ::ctrlaltdel:/sbin/reboot
+#       ::shutdown:/sbin/swapoff -a
+#       ::shutdown:/bin/umount -a -r
+#       ::restart:/sbin/init
+#       tty2::askfirst:/bin/sh
+#       tty3::askfirst:/bin/sh
+#       tty4::askfirst:/bin/sh
 #
 # Boot-time system configuration/initialization script.
 # This is run first except when booting in single-user mode.