src/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 package net
   6
   7 import (
   8         "os"
   9         "runtime"
  10         "syscall"
  11         "time"
  12         "unsafe"
  13 )
  14
  15 func setKeepAlivePeriod(fd *netFD, d time.Duration) error {
  16         // The kernel expects milliseconds so round to next highest
  17         // millisecond.
  18         msecs := uint32(roundDurationUp(d, time.Millisecond))
  19         ka := syscall.TCPKeepalive{
  20                 OnOff:    1,
  21                 Time:     msecs,
  22                 Interval: msecs,
  23         }
  24         ret := uint32(0)
  25         size := uint32(unsafe.Sizeof(ka))
  26         err := fd.pfd.WSAIoctl(syscall.SIO_KEEPALIVE_VALS, (*byte)(unsafe.Pointer(&ka)), size, nil, 0, &ret, nil, 0)
  27         runtime.KeepAlive(fd)
  28         return os.NewSyscallError("wsaioctl", err)
  29 }