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
5package net
6
7import (
8	"runtime"
9	"syscall"
10	"time"
11)
12
13const sysTCP_KEEPINTVL = 0x101
14
15func setKeepAlivePeriod(fd *netFD, d time.Duration) error {
16	// The kernel expects seconds so round to next highest second.
17	d += (time.Second - time.Nanosecond)
18	secs := int(d.Seconds())
19	switch err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, sysTCP_KEEPINTVL, secs); err {
20	case nil, syscall.ENOPROTOOPT: // OS X 10.7 and earlier don't support this option
21	default:
22		return wrapSyscallError("setsockopt", err)
23	}
24	err := fd.pfd.SetsockoptInt(syscall.IPPROTO_TCP, syscall.TCP_KEEPALIVE, secs)
25	runtime.KeepAlive(fd)
26	return wrapSyscallError("setsockopt", err)
27}
28