blob: ed0448fe985119b1751ebf175e0f5e7a15a9eccd [file] [log] [blame]
// Copyright 2017 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 socket
import (
"sync"
"syscall"
"unsafe"
)
// See version list in https://github.com/DragonFlyBSD/DragonFlyBSD/blob/master/sys/sys/param.h
var (
osreldateOnce sync.Once
osreldate uint32
)
// First __DragonFly_version after September 2019 ABI changes
// http://lists.dragonflybsd.org/pipermail/users/2019-September/358280.html
const _dragonflyABIChangeVersion = 500705
func probeProtocolStack() int {
osreldateOnce.Do(func() { osreldate, _ = syscall.SysctlUint32("kern.osreldate") })
var p uintptr
if int(unsafe.Sizeof(p)) == 8 && osreldate >= _dragonflyABIChangeVersion {
return int(unsafe.Sizeof(p))
}
// 64-bit Dragonfly before the September 2019 ABI changes still requires
// 32-bit aligned access to network subsystem.
return 4
}