github.com/ader1990/go@v0.0.0-20140630135419-8c24447fa791/src/pkg/net/tcpsockopt_windows.go (about)

     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  }