diff --git a/examples/agent.lua b/examples/agent.lua
index 45541f70..06db1108 100644
--- a/examples/agent.lua
+++ b/examples/agent.lua
@@ -4,6 +4,7 @@ local socket = require "socket"
 local sproto = require "sproto"
 local sprotoloader = require "sprotoloader"
 
+local WATCHDOG
 local host
 local send_request
 
@@ -26,6 +27,10 @@ function REQUEST:handshake()
 	return { msg = "Welcome to skynet, I will send heartbeat every 5 sec." }
 end
 
+function REQUEST:quit()
+	skynet.call(WATCHDOG, "lua", "close", client_fd)
+end
+
 local function request(name, args, response)
 	local f = assert(REQUEST[name])
 	local r = f(args)
@@ -62,7 +67,10 @@ skynet.register_protocol {
 	end
 }
 
-function CMD.start(gate, fd)
+function CMD.start(conf)
+	local fd = conf.client
+	local gate = conf.gate
+	WATCHDOG = conf.watchdog
 	-- slot 1,2 set at main.lua
 	host = sprotoloader.load(1):host "package"
 	send_request = host:attach(sprotoloader.load(2))
@@ -77,6 +85,11 @@ function CMD.start(gate, fd)
 	skynet.call(gate, "lua", "forward", fd)
 end
 
+function CMD.disconnect()
+	-- todo: do something before exit
+	skynet.exit()
+end
+
 skynet.start(function()
 	skynet.dispatch("lua", function(_,_, command, ...)
 		local f = CMD[command]
diff --git a/examples/client.lua b/examples/client.lua
index effee9c7..92aaa16e 100644
--- a/examples/client.lua
+++ b/examples/client.lua
@@ -104,7 +104,11 @@ while true do
 	dispatch_package()
 	local cmd = socket.readstdin()
 	if cmd then
-		send_request("get", { what = cmd })
+		if cmd == "quit" then
+			send_request("quit")
+		else
+			send_request("get", { what = cmd })
+		end
 	else
 		socket.usleep(100)
 	end
diff --git a/examples/proto.lua b/examples/proto.lua
index 31b0c52d..af88a4b5 100644
--- a/examples/proto.lua
+++ b/examples/proto.lua
@@ -30,6 +30,8 @@ set 3 {
 	}
 }
 
+quit 4 {}
+
 ]]
 
 proto.s2c = sprotoparser.parse [[
diff --git a/examples/watchdog.lua b/examples/watchdog.lua
index 32bceed5..29111033 100644
--- a/examples/watchdog.lua
+++ b/examples/watchdog.lua
@@ -1,6 +1,5 @@
 local skynet = require "skynet"
 local netpack = require "netpack"
-require "skynet.manager"
 
 local CMD = {}
 local SOCKET = {}
@@ -10,15 +9,16 @@ local agent = {}
 function SOCKET.open(fd, addr)
 	skynet.error("New client from : " .. addr)
 	agent[fd] = skynet.newservice("agent")
-	skynet.call(agent[fd], "lua", "start", gate, fd)
+	skynet.call(agent[fd], "lua", "start", { gate = gate, client = fd, watchdog = skynet.self() })
 end
 
 local function close_agent(fd)
 	local a = agent[fd]
+	agent[fd] = nil
 	if a then
-		-- The better way is send a message to agent, and let agent exit self.
-		skynet.kill(a)
-		agent[fd] = nil
+		skynet.call(gate, "lua", "kick", fd)
+		-- disconnect never return
+		skynet.send(a, "lua", "disconnect")
 	end
 end
 
@@ -39,6 +39,10 @@ function CMD.start(conf)
 	skynet.call(gate, "lua", "open" , conf)
 end
 
+function CMD.close(fd)
+	close_agent(fd)
+end
+
 skynet.start(function()
 	skynet.dispatch("lua", function(session, source, cmd, subcmd, ...)
 		if cmd == "socket" then
diff --git a/lualib-src/lua-netpack.c b/lualib-src/lua-netpack.c
index f42e21ca..1839abe3 100644
--- a/lualib-src/lua-netpack.c
+++ b/lualib-src/lua-netpack.c
@@ -210,6 +210,16 @@ push_more(lua_State *L, int fd, uint8_t *buffer, int size) {
 	}
 }
 
+static void
+close_uncomplete(lua_State *L, int fd) {
+	struct queue *q = lua_touserdata(L,1);
+	struct uncomplete * uc = find_uncomplete(q, fd);
+	if (uc) {
+		skynet_free(uc->pack.buffer);
+		skynet_free(uc);
+	}
+}
+
 static int
 filter_data_(lua_State *L, int fd, uint8_t * buffer, int size) {
 	struct queue *q = lua_touserdata(L,1);
@@ -343,6 +353,8 @@ lfilter(lua_State *L) {
 		// ignore listen fd connect
 		return 1;
 	case SKYNET_SOCKET_TYPE_CLOSE:
+		// no more data in fd (message->id)
+		close_uncomplete(L, message->id);
 		lua_pushvalue(L, lua_upvalueindex(TYPE_CLOSE));
 		lua_pushinteger(L, message->id);
 		return 3;
@@ -353,6 +365,8 @@ lfilter(lua_State *L) {
 		pushstring(L, buffer, size);
 		return 4;
 	case SKYNET_SOCKET_TYPE_ERROR:
+		// no more data in fd (message->id)
+		close_uncomplete(L, message->id);
 		lua_pushvalue(L, lua_upvalueindex(TYPE_ERROR));
 		lua_pushinteger(L, message->id);
 		pushstring(L, buffer, size);