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 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         d += (time.Millisecond - time.Nanosecond)
  19         msecs := uint32(d / time.Millisecond)
  20         ka := syscall.TCPKeepalive{
  21                 OnOff:    1,
  22                 Time:     msecs,
  23                 Interval: msecs,
  24         }
  25         ret := uint32(0)
  26         size := uint32(unsafe.Sizeof(ka))
  27         err := fd.pfd.WSAIoctl(syscall.SIO_KEEPALIVE_VALS, (*byte)(unsafe.Pointer(&ka)), size, nil, 0, &ret, nil, 0)
  28         runtime.KeepAlive(fd)
  29         return os.NewSyscallError("wsaioctl", err)
  30 }