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-<sect1 id="ch07-rc">
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-<title>Creating the rc script</title>
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-<?dbhtml filename="rc.html" dir="chapter07"?>
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-
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-<para>The first main boot script is the <filename>/etc/init.d/rc</filename>
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-script. Create the <filename>/etc/init.d/rc</filename> script by running the
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-following command:</para>
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-
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-<para><screen><userinput>cat > /etc/init.d/rc << "EOF"</userinput>
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-#!/bin/sh
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-# Begin /etc/init.d/rc
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-#
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-# By Jason Pearce - jason.pearce@linux.org
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-# Modified by Gerard Beekmans - gerard@linuxfromscratch.org
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-# print_error_msg based on ideas by Simon Perreault -
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-# nomis80@videotron.ca
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-#
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-
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-#
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-# Include the functions declared in the /etc/init.d/functions file
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-#
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-
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-source /etc/init.d/functions
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-
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-#
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-# The print_error_msg function prints an error message when an unforeseen
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-# error occurred that wasn't trapped for some reason by a evaluate_retval
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-# call or error checking in different ways.
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-
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-print_error_msg()
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-{
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-
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- echo
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- $FAILURE
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- echo -n "You should not read this error message. It means "
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- echo "that an unforeseen error "
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- echo -n "took place and subscript $i exited with "
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- echo "a return value "
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- echo -n "of $error_value for an unknown reason. If you're able "
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- echo "to trace this error down "
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- echo -n "to a bug in one of the files provided by this book, "
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- echo "please be so kind to "
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- echo -n "inform us at lfs-dev@linuxfromscratch.org"
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- $NORMAL
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- echo
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- echo
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- echo "Press a key to continue..."
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- read
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-
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-}
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-
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-#
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-# If you uncomment the debug variable below none of the scripts will be
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-# executed, just the script name and parameters will be echo'ed to the
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-# screen so you can see how the scripts are called by rc.
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-#
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-
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-# Un-comment the following for debugging.
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-# debug=echo
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-
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-#
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-# Start script or program.
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-#
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-startup() {
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-
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- $debug "$@"
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-
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-}
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-
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-#
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-# Ignore CTRL-C only in this shell, so we can interrupt subprocesses.
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-#
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-
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-trap ":" INT QUIT TSTP
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-
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-#
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-# Now find out what the current and what the previous runlevel are. The
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-# $RUNLEVEL variable is set by init for all it's children. This script
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-# runs as a child of init.
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-#
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-
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-runlevel=$RUNLEVEL
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-
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-#
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-# Get first argument. Set new runlevel to this argument. If no runlevel
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-# was passed to this script we won't change runlevels.
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-#
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-
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-[ "$1" != "" ] && runlevel=$1
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-if [ "$runlevel" = "" ]
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-then
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- echo "Usage: $0 <runlevel>" >&2
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- exit 1
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-fi
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-
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-#
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-# The same goes for $PREVLEVEL (see above for $RUNLEVEL). previous will
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-# be set to the previous run level. If $PREVLEVEL is not set it means
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-# that there is no previous runlevel and we'll set previous to N.
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-#
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-
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-previous=$PREVLEVEL
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-[ "$previous" = "" ] && previous=N
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-
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-export runlevel previous
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-
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-#
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-# Is there an rc directory for the new runlevel?
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-#
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-
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-if [ -d /etc/rc$runlevel.d ]
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-
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-then
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-
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-#
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-# If so, first collect all the K* scripts in the new run level.
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-#
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-
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- if [ $previous != N ]
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- then
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- for i in /etc/rc$runlevel.d/K*
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- do
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- [ ! -f $i ] && continue
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-
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-#
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-# the suffix variable will contain the script name without the leading
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-# Kxxx
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-#
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-
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- suffix=${i#/etc/rc$runlevel.d/K[0-9][0-9][0-9]}
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-#
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-# If there is a start script for this K script in the previous runlevel
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-# determine what it's full path is
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-#
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- previous_start=/etc/rc$previous.d/S[0-9][0-9][0-9]$suffix
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-#
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-# If there was no previous run level it could be that something was
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-# started in rcS.d (sysinit level) so we'll determine the path for that
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-# possibility as well.
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-#
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-
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- sysinit_start=/etc/rcS.d/S[0-9][0-9][0-9]$suffix
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-
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-#
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-# Stop the service if there is a start script in the previous run level
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-# or in the sysinit level. If previous_start or sysinit_start do not
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-# exist the 'continue' command is run which causes the script to abort
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-# this iteration of the for loop and continue with the next iteration.
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-# This boils down to that it won't run the commands after the next two
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-# lines and start over from the top of this for loop. See man bash for
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-# more info on this.
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-#
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-
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- [ ! -f $previous_start ] &&
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- [ ! -f $sysinit_start ] && continue
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-
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-#
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-# If we found previous_start or sysinit_start, run the K script
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-#
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-
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- startup $i stop
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- error_value=$?
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-#
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-# If the return value of the script is not 0, something went wrong with
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-# error checking inside the script. the print_error_msg function will be
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-# called and the message plus the return value of the K script will be
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-# printed to the screen
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-#
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-
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- if [ $error_value != 0 ]
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- then
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- print_error_msg
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- fi
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-
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- done
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- fi
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-
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-#
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-# Now run the START scripts for this runlevel.
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-#
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-
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- for i in /etc/rc$runlevel.d/S*
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- do
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- [ ! -f $i ] && continue
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-
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- if [ $previous != N ]
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- then
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-#
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-# Find start script in previous runlevel and stop script in this
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-# runlevel.
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-#
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-
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- suffix=${i#/etc/rc$runlevel.d/S[0-9][0-9][0-9]}
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- stop=/etc/rc$runlevel.d/K[0-9][0-9][0-9]$suffix
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- previous_start=/etc/rc$previous.d/S[0-9][0-9][0-9]$suffix
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-#
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-# If there is a start script in the previous level and no stop script in
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-# this level, we don't have to re-start the service; abort this
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-# iteration and start the next one.
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-#
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-
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- [ -f $previous_start ] && [ ! -f $stop ] &&
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- continue
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- fi
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-
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- case "$runlevel" in
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- 0|6)
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-
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-#
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-# levels 0 and 6 are halt and reboot levels. We don't really start
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-# anything here so we call with the 'stop' parameter
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-#
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-
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- startup $i stop
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- error_value=$?
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-#
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-# If the return value of the script is not 0, something went wrong with
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-# error checking inside the script. the print_error_msg function will be
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-# called and the message plus the return value of the K script will be
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-# printed to the screen
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-#
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-
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- if [ $error_value != 0 ]
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- then
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- print_error_msg
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- fi
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- ;;
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- *)
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- startup $i start
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- error_value=$?
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-#
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-# If the return value of the script is not 0, something went wrong with
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-# error checking inside the script. the print_error_msg function will be
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-# called and the message plus the return value of the K script will be
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-# printed to the screen
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-#
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-
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- if [ $error_value != 0 ]
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- then
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- print_error_msg
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- fi
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- ;;
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- esac
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- done
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-fi
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-
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-# End /etc/init.d/rc
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-<userinput>EOF</userinput></screen></para>
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-
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-</sect1>
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-
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Gerard Beekmans