Initial commit

vendor/github.com/cockroachdb/pebble/vfs/file_lock_windows.go

@@ -0,0 +1,41 @@
+// Copyright 2013 The LevelDB-Go and Pebble Authors. All rights reserved. Use
+// of this source code is governed by a BSD-style license that can be found in
+// the LICENSE file.
+
+//go:build windows
+// +build windows
+
+package vfs
+
+import (
+	"io"
+	"syscall"
+)
+
+// lockCloser hides all of an syscall.Handle's methods, except for Close.
+type lockCloser struct {
+	fd syscall.Handle
+}
+
+func (l lockCloser) Close() error {
+	return syscall.Close(l.fd)
+}
+
+// Lock locks the given file. On Windows, Locking will fail if the file is
+// already open by the current process.
+func (defaultFS) Lock(name string) (io.Closer, error) {
+	p, err := syscall.UTF16PtrFromString(name)
+	if err != nil {
+		return nil, err
+	}
+	fd, err := syscall.CreateFile(p,
+		syscall.GENERIC_READ|syscall.GENERIC_WRITE,
+		0, nil, syscall.CREATE_ALWAYS,
+		syscall.FILE_ATTRIBUTE_NORMAL,
+		0,
+	)
+	if err != nil {
+		return nil, err
+	}
+	return lockCloser{fd: fd}, nil
+}