Imported Upstream version 1.4upstream/1.4

1 files changed, 32 insertions, 0 deletions

diff --git a/src/net/tcpsockopt_windows.go b/src/net/tcpsockopt_windows.go
new file mode 100644
index 000000000..091f5233f
--- /dev/null
+++ b/src/net/tcpsockopt_windows.go
@@ -0,0 +1,32 @@
+// Copyright 2009 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 (
+	"os"
+	"syscall"
+	"time"
+	"unsafe"
+)
+
+func setKeepAlivePeriod(fd *netFD, d time.Duration) error {
+	if err := fd.incref(); err != nil {
+		return err
+	}
+	defer fd.decref()
+	// The kernel expects milliseconds so round to next highest
+	// millisecond.
+	d += (time.Millisecond - time.Nanosecond)
+	msecs := uint32(d / time.Millisecond)
+	ka := syscall.TCPKeepalive{
+		OnOff:    1,
+		Time:     msecs,
+		Interval: msecs,
+	}
+	ret := uint32(0)
+	size := uint32(unsafe.Sizeof(ka))
+	err := syscall.WSAIoctl(fd.sysfd, syscall.SIO_KEEPALIVE_VALS, (*byte)(unsafe.Pointer(&ka)), size, nil, 0, &ret, nil, 0)
+	return os.NewSyscallError("WSAIoctl", err)
+}