Chapter 9. The Operating System
68
A package should register its initscript services using
update rc.d
before it tries to invoke
them using
invoke rc.d
. Invocation of unregistered services may fail.
For more information about using
invoke rc.d
,
please consult its man page
invoke rc.d(8)
.
9.3.4 Boot time initialization
There used to be another directory,
/etc/rc.boot
, which contained scripts which were run
once per machine boot. This has been deprecated in favour of links from
/etc/rcS.d
to files
in
/etc/init.d
as described in `Introduction' on page
64
. Packages must not place files in
/etc/rc.boot
.
9.3.5 Example
The
bind
DNS (name server) package wants to make sure that the name server is running
in multiuser runlevels, and is properly shut down with the system. It puts a script in
/etc
/init.d
, naming the script appropriately
bind
. As you can see, the script interprets the
argument
reload
to send the name server a
HUP
signal (causing it to reload its configuration);
this way the system administrator can say
/etc/init.d/bind reload
to reload the name
server. The script has one configurable value, which can be used to pass parameters to the
named program at startup; this value is read from
/etc/default/bind
(see below).
#!/bin/sh
#
# Original version by Robert Leslie
# , edited by iwj and cs
test  x /usr/sbin/named || exit 0
# Source defaults file.
PARAMS=''
if [  f /etc/default/bind ]; then
. /etc/default/bind
fi
case "$1" in
start)
echo  n "Starting domain name service: named"
start stop daemon   start   quiet   exec /usr/sbin/named \
   $PARAMS
echo "."
;;
stop)






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