allow quick restart in Linux (actboy168#317)

Author: jpeletier

extension/script/common/net.lua

@@ -176,6 +176,15 @@ function m.listen(protocol, address, port)
             fs.remove(address)
         end
     end
+	do
+        -- set SO_REUSEADDR so we can bind again to the same address
+        -- after a quick restart:
+		local ok, err = fd:option("reuseaddr", 1)
+		if not ok then
+			fd:close()
+			return nil, err
+		end
+	end
     do
         local ok, err = fd:bind(address, port)
         if not ok then

extension/script/common/socket.lua

@@ -119,12 +119,12 @@ return function (param)
             session:close()
             fds[1] = session
         elseif t.mode == "listen" then
-            server:close()
-            fds[1] = server
-            if session ~= nil then
-                session:close()
-                fds[2] = session
-            end
+			fds[1] = server
+			if session ~= nil then
+				session:close()
+				fds[2] = session
+			end
+			server:close()
         end
         local function is_finish()
             for _, fd in ipairs(fds) do