1 files changed, 61 insertions, 0 deletions
diff --git a/src/pkg/net/dial_gen.go b/src/pkg/net/dial_gen.go
new file mode 100644
index 000000000..0a3277de4
--- /dev/null
+++ b/src/pkg/net/dial_gen.go
@@ -0,0 +1,61 @@
+// Copyright 2012 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.
+
+// +build windows plan9
+
+package net
+
+import (
+	"time"
+)
+
+// resolveAndDialChannel is the simple pure-Go implementation of
+// resolveAndDial, still used on operating systems where the deadline
+// hasn't been pushed down into the pollserver. (Plan 9 and some old
+// versions of Windows)
+func resolveAndDialChannel(net, addr string, localAddr Addr, deadline time.Time) (Conn, error) {
+	timeout := deadline.Sub(time.Now())
+	if timeout < 0 {
+		timeout = 0
+	}
+	t := time.NewTimer(timeout)
+	defer t.Stop()
+	type pair struct {
+		Conn
+		error
+	}
+	ch := make(chan pair, 1)
+	resolvedAddr := make(chan Addr, 1)
+	go func() {
+		ra, err := resolveAddr("dial", net, addr, noDeadline)
+		if err != nil {
+			ch <- pair{nil, err}
+			return
+		}
+		resolvedAddr <- ra // in case we need it for OpError
+		c, err := dial(net, addr, localAddr, ra, noDeadline)
+		ch <- pair{c, err}
+	}()
+	select {
+	case <-t.C:
+		// Try to use the real Addr in our OpError, if we resolved it
+		// before the timeout. Otherwise we just use stringAddr.
+		var ra Addr
+		select {
+		case a := <-resolvedAddr:
+			ra = a
+		default:
+			ra = &stringAddr{net, addr}
+		}
+		err := &OpError{
+			Op:   "dial",
+			Net:  net,
+			Addr: ra,
+			Err:  &timeoutError{},
+		}
+		return nil, err
+	case p := <-ch:
+		return p.Conn, p.error
+	}
+}