libgo/go/syscall/syscall_dragonfly.go

   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 syscall
   6
   7 import (
   8         "sync"
   9         "unsafe"
  10 )
  11
  12 // See version list in https://github.com/DragonFlyBSD/DragonFlyBSD/blob/master/sys/sys/param.h
  13 var (
  14         osreldateOnce sync.Once
  15         osreldate     uint32
  16 )
  17
  18 // First __DragonFly_version after September 2019 ABI changes
  19 // http://lists.dragonflybsd.org/pipermail/users/2019-September/358280.html
  20 const _dragonflyABIChangeVersion = 500705
  21
  22 func supportsABI(ver uint32) bool {
  23         osreldateOnce.Do(func() { osreldate, _ = SysctlUint32("kern.osreldate") })
  24         return osreldate >= ver
  25 }
  26
  27 func direntIno(buf []byte) (uint64, bool) {
  28         return readInt(buf, unsafe.Offsetof(Dirent{}.Fileno), unsafe.Sizeof(Dirent{}.Fileno))
  29 }
  30
  31 func direntReclen(buf []byte) (uint64, bool) {
  32         namlen, ok := direntNamlen(buf)
  33         if !ok {
  34                 return 0, false
  35         }
  36         return (16 + namlen + 1 + 7) &^ 7, true
  37 }
  38
  39 func direntNamlen(buf []byte) (uint64, bool) {
  40         return readInt(buf, unsafe.Offsetof(Dirent{}.Namlen), unsafe.Sizeof(Dirent{}.Namlen))
  41 }