1// Copyright 2009,2010 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 syscall
6
7import (
8	"sync"
9	"unsafe"
10)
11
12const (
13	_SYS_FSTAT_FREEBSD12         = 551 // { int fstat(int fd, _Out_ struct stat *sb); }
14	_SYS_FSTATAT_FREEBSD12       = 552 // { int fstatat(int fd, _In_z_ char *path, \
15	_SYS_GETDIRENTRIES_FREEBSD12 = 554 // { ssize_t getdirentries(int fd, \
16	_SYS_STATFS_FREEBSD12        = 555 // { int statfs(_In_z_ char *path, \
17	_SYS_FSTATFS_FREEBSD12       = 556 // { int fstatfs(int fd, \
18	_SYS_GETFSSTAT_FREEBSD12     = 557 // { int getfsstat( \
19	_SYS_MKNODAT_FREEBSD12       = 559 // { int mknodat(int fd, _In_z_ char *path, \
20)
21
22// See https://www.freebsd.org/doc/en_US.ISO8859-1/books/porters-handbook/versions.html.
23var (
24	osreldateOnce sync.Once
25	osreldate     uint32
26)
27
28// INO64_FIRST from /usr/src/lib/libc/sys/compat-ino64.h
29const _ino64First = 1200031
30
31func supportsABI(ver uint32) bool {
32	osreldateOnce.Do(func() { osreldate, _ = SysctlUint32("kern.osreldate") })
33	return osreldate >= ver
34}
35
36func direntIno(buf []byte) (uint64, bool) {
37	return readInt(buf, unsafe.Offsetof(Dirent{}.Fileno), unsafe.Sizeof(Dirent{}.Fileno))
38}
39
40func direntReclen(buf []byte) (uint64, bool) {
41	return readInt(buf, unsafe.Offsetof(Dirent{}.Reclen), unsafe.Sizeof(Dirent{}.Reclen))
42}
43
44func direntNamlen(buf []byte) (uint64, bool) {
45	return readInt(buf, unsafe.Offsetof(Dirent{}.Namlen), unsafe.Sizeof(Dirent{}.Namlen))
46}
47