Use sys inherits

Also use events.EventEmitter instead of process.EventEmitter.

lib/fs.js

@@ -1,3 +1,7 @@
+var
+  sys = require('sys'),
+  events = require('events');
+
 exports.Stats = process.Stats;
 
 process.Stats.prototype._checkModeProperty = function (property) {
@@ -381,6 +385,8 @@ exports.createReadStream = function(path, options) {
 };
 
 var FileReadStream = exports.FileReadStream = function(path, options) {
+  events.EventEmitter.call(this);
+
   this.path = path;
   this.fd = null;
   this.readable = true;
@@ -463,13 +469,15 @@ var FileReadStream = exports.FileReadStream = function(path, options) {
     read();
   };
 };
-FileReadStream.prototype.__proto__ = process.EventEmitter.prototype;
+sys.inherits(FileReadStream, events.EventEmitter);
 
 exports.createWriteStream = function(path, options) {
   return new FileWriteStream(path, options);
 };
 
 var FileWriteStream = exports.FileWriteStream = function(path, options) {
+  events.EventEmitter.call(this);
+
   this.path = path;
   this.fd = null;
   this.writeable = true;
@@ -564,4 +572,4 @@ var FileWriteStream = exports.FileWriteStream = function(path, options) {
 
   flush();
 };
-FileWriteStream.prototype.__proto__ = process.EventEmitter.prototype;
+sys.inherits(FileWriteStream, events.EventEmitter);