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         "syscall"
  10         "time"
  11         "unsafe"
  12 )
  13
  14 func setKeepAlivePeriod(fd *netFD, d time.Duration) error {
  15         if err := fd.incref(); err != nil {
  16                 return err
  17         }
  18         defer fd.decref()
  19         // The kernel expects milliseconds so round to next highest
  20         // millisecond.
  21         d += (time.Millisecond - time.Nanosecond)
  22         msecs := uint32(d / time.Millisecond)
  23         ka := syscall.TCPKeepalive{
  24                 OnOff:    1,
  25                 Time:     msecs,
  26                 Interval: msecs,
  27         }
  28         ret := uint32(0)
  29         size := uint32(unsafe.Sizeof(ka))
  30         err := syscall.WSAIoctl(fd.sysfd, syscall.SIO_KEEPALIVE_VALS, (*byte)(unsafe.Pointer(&ka)), size, nil, 0, &ret, nil, 0)
  31         return os.NewSyscallError("wsaioctl", err)
  32 }