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// 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)
}