1//go:build !tinygo
 2
 3package sysfs
 4
 5import (
 6	"syscall"
 7	"unsafe"
 8	_ "unsafe"
 9
10	experimentalsys "github.com/tetratelabs/wazero/experimental/sys"
11)
12
13const (
14	_AT_FDCWD   = -0x64
15	_UTIME_OMIT = (1 << 30) - 2
16)
17
18func utimens(path string, atim, mtim int64) experimentalsys.Errno {
19	times := timesToTimespecs(atim, mtim)
20	if times == nil {
21		return 0
22	}
23
24	var flags int
25	var _p0 *byte
26	_p0, err := syscall.BytePtrFromString(path)
27	if err == nil {
28		err = utimensat(_AT_FDCWD, uintptr(unsafe.Pointer(_p0)), times, flags)
29	}
30	return experimentalsys.UnwrapOSError(err)
31}
32
33// On linux, implement futimens via utimensat with the NUL path.
34func futimens(fd uintptr, atim, mtim int64) experimentalsys.Errno {
35	times := timesToTimespecs(atim, mtim)
36	if times == nil {
37		return 0
38	}
39	return experimentalsys.UnwrapOSError(utimensat(int(fd), 0 /* NUL */, times, 0))
40}
41
42// utimensat is like syscall.utimensat special-cased to accept a NUL string for the path value.
43func utimensat(dirfd int, strPtr uintptr, times *[2]syscall.Timespec, flags int) (err error) {
44	_, _, e1 := syscall.Syscall6(syscall.SYS_UTIMENSAT, uintptr(dirfd), strPtr, uintptr(unsafe.Pointer(times)), uintptr(flags), 0, 0)
45	if e1 != 0 {
46		err = e1
47	}
48	return
49}