diff -Nru dhcp-4.0.0.orig/client/scripts/linux dhcp-4.0.0/client/scripts/linux
--- dhcp-4.0.0.orig/client/scripts/linux	2007-06-07 00:57:32.000000000 +0200
+++ dhcp-4.0.0/client/scripts/linux	2008-07-03 10:12:37.000000000 +0200
@@ -27,7 +27,11 @@
 
 make_resolv_conf() {
   if [ x"$new_domain_name_servers" != x ]; then
-    cat /dev/null > /etc/resolv.conf.dhclient
+    LOCKLINE=`grep -m1 "^; lock [0-9]\+" /etc/resolv.conf 2>/dev/null`
+    if [ "$LOCKLINE" ] ; then
+       [ -e /proc/${LOCKLINE##; lock } ] && return
+    fi
+    echo "; generated by /sbin/dhclient-script" > /etc/resolv.conf.dhclient
     chmod 644 /etc/resolv.conf.dhclient
     if [ x"$new_domain_search" != x ]; then
       echo search $new_domain_search >> /etc/resolv.conf.dhclient
@@ -43,7 +47,7 @@
 
     mv /etc/resolv.conf.dhclient /etc/resolv.conf
   elif [ "x${new_dhcp6_name_servers}" != x ] ; then
-    cat /dev/null > /etc/resolv.conf.dhclient6
+    echo "; generated by /sbin/dhclient-script" > /etc/resolv.conf.dhclient6
     chmod 644 /etc/resolv.conf.dhclient6
 
     if [ "x${new_dhcp6_domain_search}" != x ] ; then