Add FileSystemWatcher class to dart:io.

runtime/bin/file_system_watcher.cc

+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#include "bin/file_system_watcher.h"
+
+#include "bin/builtin.h"
+#include "bin/dartutils.h"
+
+#include "include/dart_api.h"
+
+namespace dart {
+namespace bin {
+
+void FUNCTION_NAME(FileSystemWatcher_WatchPath)(Dart_NativeArguments args) {
+  const char* path = DartUtils::GetStringValue(Dart_GetNativeArgument(args, 1));
+  int events = DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 2));
+  bool recursive = DartUtils::GetBooleanValue(Dart_GetNativeArgument(args, 3));
+  intptr_t path_id = FileSystemWatcher::WatchPath(path, events, recursive);
+  if (path_id == -1) {
+    Dart_SetReturnValue(args, DartUtils::NewDartOSError());
+  } else {
+    Dart_SetReturnValue(args, Dart_NewInteger(path_id));
+  }
+}
+
+
+void FUNCTION_NAME(FileSystemWatcher_UnwatchPath)(Dart_NativeArguments args) {
+  intptr_t id = DartUtils::GetIntptrValue(Dart_GetNativeArgument(args, 1));
+  FileSystemWatcher::UnwatchPath(id);
+}
+
+
+void FUNCTION_NAME(FileSystemWatcher_GetSocketId)(Dart_NativeArguments args) {
+  intptr_t id = DartUtils::GetIntptrValue(Dart_GetNativeArgument(args, 1));
+  intptr_t socket_id = FileSystemWatcher::GetSocketId(id);
+  Dart_SetReturnValue(args, Dart_NewInteger(socket_id));
+}
+
+void FUNCTION_NAME(FileSystemWatcher_ReadEvents)(Dart_NativeArguments args) {
+  intptr_t id = DartUtils::GetIntptrValue(Dart_GetNativeArgument(args, 1));
+  FileSystemWatcher::Event* events = NULL;
+  intptr_t count = FileSystemWatcher::ReadEvents(id, &events);
+  if (count < 0) {
+    Dart_ThrowException(DartUtils::NewDartOSError());
+  }
+  Dart_Handle result = Dart_NewList(count);
+  for (intptr_t i = 0; i < count; i++) {
+    Dart_Handle event = Dart_NewList(4);
+    Dart_ListSetAt(event, 0, Dart_NewInteger(events[i].event));
+    Dart_ListSetAt(event, 1, Dart_NewInteger(events[i].path_id));
+    if (events[i].filename != NULL) {
+      Dart_ListSetAt(event, 2, Dart_NewStringFromCString(events[i].filename));
+      free(const_cast<char*>(events[i].filename));
+    } else {
+      Dart_ListSetAt(event, 2, Dart_Null());
+    }
+    Dart_ListSetAt(event, 3, Dart_NewInteger(events[i].link));
+    Dart_ListSetAt(result, i, event);
+  }
+  delete[] events;
+  Dart_SetReturnValue(args, result);
+}
+
+}  // namespace bin
+}  // namespace dart