1 files changed, 82 insertions, 0 deletions
diff --git a/src/pkg/net/mockserver_test.go b/src/pkg/net/mockserver_test.go
new file mode 100644
index 000000000..68ded5d75
--- /dev/null
+++ b/src/pkg/net/mockserver_test.go
@@ -0,0 +1,82 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+import "sync"
+
+type streamListener struct {
+	net, addr string
+	ln        Listener
+}
+
+type dualStackServer struct {
+	lnmu sync.RWMutex
+	lns  []streamListener
+	port string
+
+	cmu sync.RWMutex
+	cs  []Conn // established connections at the passive open side
+}
+
+func (dss *dualStackServer) buildup(server func(*dualStackServer, Listener)) error {
+	for i := range dss.lns {
+		go server(dss, dss.lns[i].ln)
+	}
+	return nil
+}
+
+func (dss *dualStackServer) putConn(c Conn) error {
+	dss.cmu.Lock()
+	dss.cs = append(dss.cs, c)
+	dss.cmu.Unlock()
+	return nil
+}
+
+func (dss *dualStackServer) teardownNetwork(net string) error {
+	dss.lnmu.Lock()
+	for i := range dss.lns {
+		if net == dss.lns[i].net && dss.lns[i].ln != nil {
+			dss.lns[i].ln.Close()
+			dss.lns[i].ln = nil
+		}
+	}
+	dss.lnmu.Unlock()
+	return nil
+}
+
+func (dss *dualStackServer) teardown() error {
+	dss.lnmu.Lock()
+	for i := range dss.lns {
+		if dss.lns[i].ln != nil {
+			dss.lns[i].ln.Close()
+		}
+	}
+	dss.lnmu.Unlock()
+	dss.cmu.Lock()
+	for _, c := range dss.cs {
+		c.Close()
+	}
+	dss.cmu.Unlock()
+	return nil
+}
+
+func newDualStackServer(lns []streamListener) (*dualStackServer, error) {
+	dss := &dualStackServer{lns: lns, port: "0"}
+	for i := range dss.lns {
+		ln, err := Listen(dss.lns[i].net, dss.lns[i].addr+":"+dss.port)
+		if err != nil {
+			dss.teardown()
+			return nil, err
+		}
+		dss.lns[i].ln = ln
+		if dss.port == "0" {
+			if _, dss.port, err = SplitHostPort(ln.Addr().String()); err != nil {
+				dss.teardown()
+				return nil, err
+			}
+		}
+	}
+	return dss, nil
+}