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Source file src/net/tcpsockopt_windows.go

Documentation: net

  // 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"
  	"runtime"
  	"syscall"
  	"time"
  	"unsafe"
  )
  
  func setKeepAlivePeriod(fd *netFD, d time.Duration) error {
  	// 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 := fd.pfd.WSAIoctl(syscall.SIO_KEEPALIVE_VALS, (*byte)(unsafe.Pointer(&ka)), size, nil, 0, &ret, nil, 0)
  	runtime.KeepAlive(fd)
  	return os.NewSyscallError("wsaioctl", err)
  }
  

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