Handle stdio redirection in standalone VM

runtime/bin/file.h

Index: runtime/bin/file.h
diff --git a/runtime/bin/file.h b/runtime/bin/file.h
index b4e78d8224d44e43919ea452333cd45835ea573e..deffe0e42c4d2ed5cf28fd173d0ae1cc6affee35 100644
--- a/runtime/bin/file.h
+++ b/runtime/bin/file.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, 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.
 
@@ -29,6 +29,13 @@ class File {
     kWriteTruncate = kWrite | kTruncate
   };
 
+  enum StdioHandleType {
+    kTerminal = 0,
+    kPipe = 1,
+    kFile = 2,
+    kOther = 3
+  };
+
   ~File();
 
   // Read/Write attempt to transfer num_bytes to/from buffer. It returns
@@ -72,6 +79,10 @@ class File {
   // mode contains kTruncate.
   static File* Open(const char* name, FileOpenMode mode);
 
+  // Create a file object for the specified stdio file descriptor
+  // (stdin, stout or stderr).
+  static File* OpenStdio(int fd);
+
   static bool Exists(const char* name);
   static bool Create(const char* name);
   static bool Delete(const char* name);
@@ -79,6 +90,7 @@ class File {
   static char* GetCanonicalPath(const char* name);
   static const char* PathSeparator();
   static const char* StringEscapedPathSeparator();
+  static StdioHandleType GetStdioHandleType(int fd);
 
  private:
   File(const char* name, FileHandle* handle) : name_(name), handle_(handle) { }