From 13ac59fc2e0af198f15e5a8291bc3cbc6d22a711 Mon Sep 17 00:00:00 2001
From: tzafrir <tzafrir@5390a7c7-147a-4af0-8ec9-7488f05a26cb>
Date: Thu, 1 Mar 2007 08:16:41 +0000
Subject: Fixed module unloading in the zaptel init script.

git-svn-id: http://svn.digium.com/svn/zaptel/trunk@2256 5390a7c7-147a-4af0-8ec9-7488f05a26cb
---
 zaptel.init | 46 +++++++++++++++++++++++++++-------------------
 1 file changed, 27 insertions(+), 19 deletions(-)

(limited to 'zaptel.init')

diff --git a/zaptel.init b/zaptel.init
index 268570e..2951554 100644
--- a/zaptel.init
+++ b/zaptel.init
@@ -37,11 +37,26 @@ if [ -z "${MODULES}" ]; then
 	MODULES="tor2 wct4xxp wct1xxp wcte11xp wcfxo wctdm wctdm24xxp" 
 fi
 
-RMODULES=""
-# Reverse list for un-loading; don't change
-for x in $MODULES; do 
-    RMODULES="$x $RMODULES"
-done
+# recursively unload a module and its dependencies, if possible.
+# where's modprobe -r when you need it?
+# inputs: module to unload.
+# returns: the result from 
+unload_module() {
+	module="$1"
+	line=`lsmod 2>/dev/null | grep "^$1 "`
+	if [ "$line" = '' ]; then return; fi # module was not loaded
+
+	set -- $line
+	# $1: the original module, $2: size, $3: refcount, $4: deps list
+	mods=`echo $4 | tr , ' '`
+	for mod in $mods; do
+		# run in a subshell, so it won't step over our vars:
+		(unload_module $mod) 
+		# TODO: the following is probably the error handling we want:
+		# if [ $? != 0 ]; then return 1; fi
+	done
+	rmmod $module
+}
 
 # Check that telephony is up.
 [ "${TELEPHONY}" = "yes" ] || exit 0
@@ -107,24 +122,17 @@ case "$1" in
   stop)
 	# Unload drivers
 	echo -n "Unloading zaptel hardware drivers:"
-	for x in $RMODULES; do 
-		if rmmod ${x} >& /dev/null; then
-			echo -n " $x"
-		fi
-	done
-	echo "."
-
-	if [ $system = debian ]; then
-	    echo -n "Removing zaptel module: " 
-	    rmmod zaptel >& /dev/null && echo -n "done"
-	    echo "."
-	elif [ $system = redhat ]; then
-	    action "Removing zaptel module: " rmmod zaptel
-	fi
+  	unload_module zaptel
 	RETVAL=$?
+	echo "."
 
 	[ $RETVAL -eq 0 ] && rm -f $LOCKFILE
 	;;
+  unload)
+	# We don't have zaptel helper, so let's not replicate too much code:
+	# allow others to use the unload command.
+	unload zaptel
+	;;
   restart)
 	$0 stop
 	$0 start
-- 
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