| // 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 |
| } |