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
