* Add rmdir, mkdir -p and umask to d8 on Unix....

src/d8.h

Index: src/d8.h
===================================================================
--- src/d8.h	(revision 1649)
+++ src/d8.h	(working copy)
@@ -149,11 +149,23 @@
   //
   // os.setenv(variable, value) sets an environment variable.  Repeated calls to
   // this method leak memory due to the API of setenv in the standard C library.
+  //
+  // os.umask(alue) calls the umask system call and returns the old umask.
+  //
+  // os.mkdirp(name, mask) creates a directory.  The mask (if present) is anded
+  // with the current umask.  Intermediate directories are created if necessary.
+  // An exception is not thrown if the directory already exists.  Analogous to
+  // the "mkdir -p" command.
   static Handle<Value> OSObject(const Arguments& args);
   static Handle<Value> System(const Arguments& args);
   static Handle<Value> ChangeDirectory(const Arguments& args);
   static Handle<Value> SetEnvironment(const Arguments& args);
+  static Handle<Value> SetUMask(const Arguments& args);
+  static Handle<Value> MakeDirectory(const Arguments& args);
+  static Handle<Value> RemoveDirectory(const Arguments& args);
 
+  static void AddOSMethods(Handle<ObjectTemplate> os_template);
+
   static Handle<Context> utility_context() { return utility_context_; }
 
   static const char* kHistoryFileName;