github.com/peggyl/go@v0.0.0-20151008231540-ae315999c2d5/src/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  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  }