defer chtmpdir(t)()
	touch(t, "file1")

	err := syscall.Faccessat(_AT_FDCWD, "file1", _R_OK, 0)
	if err != nil {
		t.Errorf("Faccessat: unexpected error: %v", err)
	}

	err = syscall.Faccessat(_AT_FDCWD, "file1", _R_OK, 2)
	if err != syscall.EINVAL {
		t.Errorf("Faccessat: unexpected error: %v, want EINVAL", err)
	}

	err = syscall.Faccessat(_AT_FDCWD, "file1", _R_OK, _AT_EACCESS)
	if err != nil {

	// The Linux kernel faccessat system call does not take any flags.
	// The glibc faccessat implements the flags itself; see
	// https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/faccessat.c;hb=HEAD
	// Because people naturally expect syscall.Faccessat to act
	// like C faccessat, we do the same.

	if flags & ^(_AT_SYMLINK_NOFOLLOW|_AT_EACCESS) != 0 {
		return EINVAL
	}

	var st Stat_t

}

func (ts *StTimespec_t) Nano() int64 {
	return int64(ts.Sec)*1e9 + int64(ts.Nsec)
}

/*
 * Wrapped
 */

func Access(path string, mode uint32) (err error) {
	return Faccessat(_AT_FDCWD, path, mode, 0)
}

// fcntl must never be called with cmd=F_DUP2FD because it doesn't work on AIX
// There is no way to create a custom fcntl and to keep //sys fcntl easily,

//sys	ExtattrListLink(link string, attrnamespace int, data uintptr, nbytes int) (ret int, err error)
//sys	Fadvise(fd int, offset int64, length int64, advice int) (err error) = SYS_POSIX_FADVISE
//sys	Faccessat(dirfd int, path string, mode uint32, flags int) (err error)
//sys	Fchdir(fd int) (err error)
//sys	Fchflags(fd int, flags int) (err error)
//sys	Fchmod(fd int, mode uint32) (err error)

//go:cgo_import_dynamic libc_Chroot chroot "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_Close close "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_Dup dup "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_Faccessat faccessat "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_Fchdir fchdir "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_Fchmod fchmod "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_Fchmodat fchmodat "libc.a/shr_64.o"