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

// wrap it in our own nicer implementation.

package unix

import "unsafe"

/*
 * Wrapped
 */

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

func Chmod(path string, mode uint32) (err error) {
	return Fchmodat(AT_FDCWD, path, mode, 0)
}

func Chown(path string, uid int, gid int) (err error) {

}

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

//sys	ClockGettime(clockid int32, time *Timespec) (err error)
//sys	Close(fd int) (err error)
//sys	Dup(fd int) (nfd int, err error)
//sys	Dup2(from int, to int) (err error)
//sys	Exit(code int)
//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)

//sys	Close(fd int) (err error)
//sys	Dup(fd int) (nfd int, err error)
//sys	Dup2(from int, to int) (err error)
//sys	Dup3(from int, to int, flags int) (err error)
//sys	Exit(code int)
//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)

func Exit(code int) {
	C.exit(C.int(code))
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func Faccessat(dirfd int, path string, mode uint32, flags int) (err error) {
	_p0 := uintptr(unsafe.Pointer(C.CString(path)))
	r0, er := C.faccessat(C.int(dirfd), C.uintptr_t(_p0), C.uint(mode), C.int(flags))
	if r0 == -1 && er != nil {
		err = er
	}
	return
}

	SYS_CPUSET_GETAFFINITY       = 487 // { int cpuset_getaffinity(cpulevel_t level, \
	SYS_CPUSET_SETAFFINITY       = 488 // { int cpuset_setaffinity(cpulevel_t level, \
	SYS_FACCESSAT                = 489 // { int faccessat(int fd, char *path, int amode, \
	SYS_FCHMODAT                 = 490 // { int fchmodat(int fd, char *path, mode_t mode, \
	SYS_FCHOWNAT                 = 491 // { int fchownat(int fd, char *path, uid_t uid, \

int fcntl(uintptr_t, int, uintptr_t);
int fsync_range(int, int, long long, long long);
int acct(uintptr_t);
int chdir(uintptr_t);
int chroot(uintptr_t);
int close(int);
int dup(int);
void exit(int);
int faccessat(int, uintptr_t, unsigned int, int);
int fchdir(int);
int fchmod(int, unsigned int);
int fchmodat(int, uintptr_t, unsigned int, int);
int fchownat(int, uintptr_t, int, int, int);
int fdatasync(int);
int getpgid(int);