// 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. msecs := uint32(roundDurationUp(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) }