type syscallDescriptor = syscall.Handle

// chdir changes the current working directory to the named directory,
// and then restore the original working directory at the end of the test.
func chdir(t *testing.T, dir string) {
	olddir, err := os.Getwd()
	if err != nil {
		t.Fatalf("chdir: %v", err)
	}
	if err := os.Chdir(dir); err != nil {
		t.Fatalf("chdir %s: %v", dir, err)
	}

	t.Cleanup(func() {

		// every time fixLongPath is called with a relative path, so we use a cache.
		// Note that getwdCache might be outdated if the working directory has been
		// changed without using os.Chdir, i.e. using syscall.Chdir directly or cgo.
		// This is fine, as the worst that can happen is that we fail to fix the path.
		getwdCache.Lock()
		if getwdCache.dir == "" {
			// Init the working directory cache.

	// If there is no SysProcAttr (ie. no Chroot or changed
	// UID/GID), double-check existence of the directory we want
	// to chdir into. We can make the error clearer this way.
	if attr != nil && attr.Sys == nil && attr.Dir != "" {
		if _, err := Stat(attr.Dir); err != nil {
			pe := err.(*PathError)
			pe.Op = "chdir"
			return nil, pe
		}
	}

	sysattr := &syscall.ProcAttr{
		Dir: attr.Dir,
		Env: attr.Env,

	l.add("getenv", key)
}

func (l *testLog) Open(name string) {
	l.add("open", name)
}

func (l *testLog) Stat(name string) {
	l.add("stat", name)
}

func (l *testLog) Chdir(name string) {
	l.add("chdir", name)
}

// add adds the (op, name) pair to the test log.
func (l *testLog) add(op, name string) {
	if strings.Contains(name, "\n") || name == "" {
		return
	}

	l.mu.Lock()

	flagSet.BoolVar(&short, "short", false, "one-line representation for each symbol")
	flagSet.Parse(args)
	telemetry.Inc("doc/invocations")
	telemetry.CountFlags("doc/flag:", *flag.CommandLine)
	if chdir != "" {
		if err := os.Chdir(chdir); err != nil {
			return err
		}
	}
	var paths []string
	var symbol, method string
	// Loop until something is printed.
	dirs.Reset()
	for i := 0; ; i++ {

		dir = "/tmp"
	}
	return dir
}

// Chdir changes the current working directory to the file,
// which must be a directory.
// If there is an error, it will be of type *PathError.
func (f *File) Chdir() error {
	if err := f.incref("chdir"); err != nil {
		return err
	}
	defer f.decref()
	if e := syscall.Fchdir(f.fd); e != nil {
		return &PathError{Op: "chdir", Path: f.name, Err: e}
	}
	return nil
}

	if err != nil {
		t.Fatalf("Getwd: %s", err)
	}
	defer Chdir(wd)

	fd, err := Open(".")
	if err != nil {
		t.Fatalf("Open .: %s", err)
	}
	defer fd.Close()

	if err := Chdir("/"); err != nil {
		t.Fatalf("Chdir /: %s", err)
	}

	if err := fd.Chdir(); err != nil {
		t.Fatalf("fd.Chdir: %s", err)
	}

	wdNew, err := Getwd()
	if err != nil {

	testMkdirAllAtRoot(t, volName)
}

func TestRemoveAllLongPathRelative(t *testing.T) {
	// Test that RemoveAll doesn't hang with long relative paths.
	// See go.dev/issue/36375.
	tmp := t.TempDir()
	chdir(t, tmp)
	dir := filepath.Join(tmp, "foo", "bar", strings.Repeat("a", 150), strings.Repeat("b", 150))
	err := os.MkdirAll(dir, 0755)
	if err != nil {
		t.Fatal(err)
	}
	err = os.RemoveAll("foo")
	if err != nil {

		return err
	}
	return Chmod(name, fi.Mode()|ModeSticky)
}

// Chdir changes the current working directory to the named directory.
// If there is an error, it will be of type *PathError.
func Chdir(dir string) error {
	if e := syscall.Chdir(dir); e != nil {
		testlog.Open(dir) // observe likely non-existent directory
		return &PathError{Op: "chdir", Path: dir, Err: e}
	}
	if runtime.GOOS == "windows" {
		getwdCache.Lock()

//
//  2. A toolchain switch later on reinvokes the new go command with the same arguments.
//     The parent toolchain has already done the chdir; the child must not try to do it again.
func handleChdirFlag() {
	_, used := lookupCmd(os.Args[1:])
	used++ // because of [1:]
	if used >= len(os.Args) {
		return
	}

	var dir string