ntpclient: initial frequency offset configuration and adjtimex invocation

This adds a new config file section "ntpdrift" to /etc/config/ntpclient
to support setting an initial value "freq" for frequency offset.
Changes /etc/hotplug.d/iface/20-ntpclient to call adjtimex
and do an initial frequency offset before starting ntpclient.

Signed-off-by: Steffen Hoffmann <hoff.st@shaas.net>


git-svn-id: svn://svn.openwrt.org/openwrt/packages@10355 3c298f89-4303-0410-b956-a3cf2f4a3e73

net/ntpclient/files/ntpclient.config

@@ -17,3 +17,6 @@ config ntpclient
 	option hostname '3.openwrt.pool.ntp.org'
 	option port     '123'
 	option count    '1'
+
+config ntpdrift
+	option freq     '0'

net/ntpclient/files/ntpclient.hotplug

@@ -9,6 +9,17 @@ config_cb() {
 	local cfgtype
 	config_get cfgtype "$cfg" TYPE
 
+	# initial frequency offset, if configured
+	case "$cfgtype" in
+		ntpdrift)
+			config_get freq		$cfg freq
+
+			if [ ! "$freq" = "" ]; then
+				adjtimex -f $freq
+			fi
+		;;
+	esac
+
 	case "$cfgtype" in
 		ntpclient)
 			config_get hostname	$cfg hostname