{&os.SyscallError{Err: fs.ErrPermission}, true},
}

func TestIsPermission(t *testing.T) {
	for _, tt := range isPermissionTests {
		if got := os.IsPermission(tt.err); got != tt.want {
			t.Errorf("os.IsPermission(%#v) = %v; want %v", tt.err, got, tt.want)
		}
		if got := errors.Is(tt.err, fs.ErrPermission); got != tt.want {
			t.Errorf("errors.Is(%#v, fs.ErrPermission) = %v; want %v", tt.err, got, tt.want)

	}

	attr := &os.ProcAttr{
		Sys: &syscall.SysProcAttr{
			Ptrace: true,
		},
	}
	proc, err := os.StartProcess(bin, []string{bin}, attr)
	if err == nil {
		proc.Kill()
	}
	if err != nil && !os.IsPermission(err) {
		t.Fatalf("StartProcess with ptrace enabled failed: %v", err)
	}

	return underlyingErrorIs(err, ErrNotExist)
}

// IsPermission returns a boolean indicating whether the error is known to
// report that permission is denied. It is satisfied by [ErrPermission] as well
// as some syscall errors.
//
// This function predates [errors.Is]. It only supports errors returned by
// the os package. New code should use errors.Is(err, fs.ErrPermission).
func IsPermission(err error) bool {

				return err
			}
		}
	}

	// Remove directory.
	err1 := Remove(path)
	if err1 == nil || IsNotExist(err1) {
		return nil
	}
	if runtime.GOOS == "windows" && IsPermission(err1) {
		if fs, err := Stat(path); err == nil {
			if err = Chmod(path, FileMode(0200|int(fs.Mode()))); err == nil {
				err1 = Remove(path)
			}
		}
	}
	if err == nil {
		err = err1
	}

	proc, err := os.StartProcess(helloBin, []string{helloBin}, &os.ProcAttr{
		Env:   []string{"GOTRACEBACK=system", "TEST_OUTPUT=" + tempfilePath},
		Files: []*os.File{os.Stdin, pw},
	})
	if err != nil {
		if os.IsPermission(err) {
			t.Skip("don't have execute permission on setuid binary, possibly directory permission issue?")
		}
		t.Fatal(err)
	}
	done := make(chan bool, 1)
	go func() {
		io.Copy(b, pr)
		pr.Close()

			out, err := cmd.CombinedOutput()
			t.Logf("%v: %v", cmd, err)

			if uid != 0 && setgroups {
				t.Logf("as non-root, expected permission error due to unprivileged gid_map")
				if !os.IsPermission(err) {
					if err == nil {
						t.Skipf("unexpected success: probably old kernel without security fix?")
					}
					if testenv.SyscallIsNotSupported(err) {

			URL:        u.Redacted(),
			Status:     http.StatusText(http.StatusNotFound),
			StatusCode: http.StatusNotFound,
			Body:       http.NoBody,
			fileErr:    err,
		}, nil
	}

	if os.IsPermission(err) {
		return &Response{
			URL:        u.Redacted(),
			Status:     http.StatusText(http.StatusForbidden),
			StatusCode: http.StatusForbidden,
			Body:       http.NoBody,
			fileErr:    err,
		}, nil

	dir, err := f.Stat()
	if err != nil {
		t.Fatalf("stat %s: %s", f.Name(), err)
	}

	linkname := f.Name() + "2"
	if err := Symlink(f.Name(), linkname); err != nil {
		if runtime.GOOS == "android" && IsPermission(err) {
			t.Skip("skipping test on Android; permission error creating symlink")
		}
		t.Fatalf("link %s -> %s: %v", f.Name(), linkname, err)
	}
	defer Remove(linkname)

	if cleanUp {
		bgFormatErasureCleanupTmp(s.drivePath) // cleanup any old data.
	}

	formatData, formatFi, err := formatErasureMigrate(s.drivePath)
	if err != nil && !errors.Is(err, os.ErrNotExist) {
		if os.IsPermission(err) {
			return s, errDiskAccessDenied
		} else if isSysErrIO(err) {
			return s, errFaultyDisk
		}
		return s, err
	}
	s.formatData = formatData
	s.formatFileInfo = formatFi

		{"Getuid", Func, 0},
		{"Getwd", Func, 0},
		{"Hostname", Func, 0},
		{"Interrupt", Var, 0},
		{"IsExist", Func, 0},
		{"IsNotExist", Func, 0},
		{"IsPathSeparator", Func, 0},
		{"IsPermission", Func, 0},
		{"IsTimeout", Func, 10},
		{"Kill", Var, 0},
		{"Lchown", Func, 0},
		{"Link", Func, 0},
		{"LinkError", Type, 0},
		{"LinkError.Err", Field, 0},
		{"LinkError.New", Field, 0},