libgo/go/net/tcpsockopt_windows.go

   1 // Copyright 2009 The Go Authors.  All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 // TCP socket options for windows
   6
   7 package net
   8
   9 import (
  10         "os"
  11         "syscall"
  12         "time"
  13         "unsafe"
  14 )
  15
  16 func setKeepAlivePeriod(fd *netFD, d time.Duration) error {
  17         if err := fd.incref(); err != nil {
  18                 return err
  19         }
  20         defer fd.decref()
  21
  22         // Windows expects milliseconds so round to next highest millisecond.
  23         d += (time.Millisecond - time.Nanosecond)
  24         millis := uint32(d / time.Millisecond)
  25         ka := syscall.TCPKeepalive{
  26                 OnOff:    1,
  27                 Time:     millis,
  28                 Interval: millis,
  29         }
  30         ret := uint32(0)
  31         size := uint32(unsafe.Sizeof(ka))
  32         err := syscall.WSAIoctl(fd.sysfd, syscall.SIO_KEEPALIVE_VALS, (*byte)(unsafe.Pointer(&ka)), size, nil, 0, &ret, nil, 0)
  33         return os.NewSyscallError("WSAIoctl", err)
  34 }