Golang syscall.FindClose函數代碼示例

func (file *file) close() error {
	if file == nil {
		return syscall.EINVAL
	}
	if file.isdir() && file.dirinfo.isempty {
		// "special" empty directories
		return nil
	}
	if file.fd == syscall.InvalidHandle {
		return syscall.EINVAL
	}
	var e error
	if file.isdir() {
		e = syscall.FindClose(syscall.Handle(file.fd))
	} else {
		e = syscall.CloseHandle(syscall.Handle(file.fd))
	}
	var err error
	if e != nil {
		err = &PathError{"close", file.name, e}
	}
	file.fd = syscall.InvalidHandle // so it can't be closed again

	// no need for a finalizer anymore
	runtime.SetFinalizer(file, nil)
	return err
}

// normBase retruns the last element of path.
func normBase(path string) (string, error) {
	p, err := syscall.UTF16PtrFromString(path)
	if err != nil {
		return "", err
	}

	var data syscall.Win32finddata

	h, err := syscall.FindFirstFile(p, &data)
	if err != nil {
		return "", err
	}
	syscall.FindClose(h)

	return syscall.UTF16ToString(data.FileName[:]), nil
}

// Close closes the File, rendering it unusable for I/O.
// It returns an Error, if any.
func (file *File) Close() Error {
	if file == nil || file.fd < 0 {
		return EINVAL
	}
	var e int
	if file.isdir() {
		e = syscall.FindClose(syscall.Handle(file.fd))
	} else {
		e = syscall.CloseHandle(syscall.Handle(file.fd))
	}
	var err Error
	if e != 0 {
		err = &PathError{"close", file.name, Errno(e)}
	}
	file.fd = syscall.InvalidHandle // so it can't be closed again

	// no need for a finalizer anymore
	runtime.SetFinalizer(file, nil)
	return err
}

// Lstat returns the FileInfo structure describing the named file.
// If the file is a symbolic link, the returned FileInfo
// describes the symbolic link. Lstat makes no attempt to follow the link.
// If there is an error, it will be of type *PathError.
func Lstat(name string) (FileInfo, error) {
	if len(name) == 0 {
		return nil, &PathError{"Lstat", name, syscall.Errno(syscall.ERROR_PATH_NOT_FOUND)}
	}
	if name == DevNull {
		return &devNullStat, nil
	}
	fs := &fileStat{name: basename(name)}
	namep, e := syscall.UTF16PtrFromString(fixLongPath(name))
	if e != nil {
		return nil, &PathError{"Lstat", name, e}
	}
	e = syscall.GetFileAttributesEx(namep, syscall.GetFileExInfoStandard, (*byte)(unsafe.Pointer(&fs.sys)))
	if e != nil {
		if e != windows.ERROR_SHARING_VIOLATION {
			return nil, &PathError{"GetFileAttributesEx", name, e}
		}
		// try FindFirstFile now that GetFileAttributesEx failed
		var fd syscall.Win32finddata
		h, e2 := syscall.FindFirstFile(namep, &fd)
		if e2 != nil {
			return nil, &PathError{"FindFirstFile", name, e}
		}
		syscall.FindClose(h)

		fs.sys.FileAttributes = fd.FileAttributes
		fs.sys.CreationTime = fd.CreationTime
		fs.sys.LastAccessTime = fd.LastAccessTime
		fs.sys.LastWriteTime = fd.LastWriteTime
		fs.sys.FileSizeHigh = fd.FileSizeHigh
		fs.sys.FileSizeLow = fd.FileSizeLow
	}
	fs.path = name
	if !isAbs(fs.path) {
		fs.path, e = syscall.FullPath(fs.path)
		if e != nil {
			return nil, e
		}
	}
	return fs, nil
}

func TestWin32finddata(t *testing.T) {
	dir, err := ioutil.TempDir("", "go-build")
	if err != nil {
		t.Fatalf("failed to create temp directory: %v", err)
	}
	defer os.RemoveAll(dir)

	path := filepath.Join(dir, "long_name.and_extension")
	f, err := os.Create(path)
	if err != nil {
		t.Fatalf("failed to create %v: %v", path, err)
	}
	f.Close()

	type X struct {
		fd  syscall.Win32finddata
		got byte
		pad [10]byte // to protect ourselves

	}
	var want byte = 2 // it is unlikely to have this character in the filename
	x := X{got: want}

	pathp, _ := syscall.UTF16PtrFromString(path)
	h, err := syscall.FindFirstFile(pathp, &(x.fd))
	if err != nil {
		t.Fatalf("FindFirstFile failed: %v", err)
	}
	err = syscall.FindClose(h)
	if err != nil {
		t.Fatalf("FindClose failed: %v", err)
	}

	if x.got != want {
		t.Fatalf("memory corruption: want=%d got=%d", want, x.got)
	}
}

func (this *FileInfo) close() {
	syscall.FindClose(this.handle)
}