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Source file src/net/tcpsockopt_windows.go

Documentation: net

     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  }
    31  

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