Work in progres, please take a look and give early feedback if this is the way we want to structure…

tests/ffi/ffi_timeofday_test.dart

 // Copyright (c) 2014, the Fletch 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.md file.
 
 import 'dart:ffi';
 import 'dart:io' as io;
 import "package:expect/expect.dart";
 
-abstract class Timeval implements Foreign {
+abstract class Timeval implements ForeignMemory {
   factory Timeval() {
     switch (Foreign.bitsPerMachineWord) {
       case 32: return new Timeval32();
       case 64: return new Timeval64();
       default: throw "Unsupported machine word size.";
     }
   }
   int get tv_sec;
   int get tv_usec;
 }
 
-class Timeval32 extends Foreign implements Timeval {
+class Timeval32 extends ForeignMemory implements Timeval {
   Timeval32() : super.allocated(8);
   int get tv_sec => getInt32(0);
   int get tv_usec => getInt32(4);
 }
 
-class Timeval64 extends Foreign implements Timeval {
+class Timeval64 extends ForeignMemory implements Timeval {
   Timeval64() : super.allocated(16);
   int get tv_sec => getInt64(0);
   int get tv_usec => getInt64(8);
 }
 
-final Foreign gettimeofday = Foreign.lookup('gettimeofday');
+final ForeignFunction gettimeofday = ForeignLibrary.main.lookup('gettimeofday');
 
 main() {
   Timeval timeval = new Timeval();
   Expect.equals(0, gettimeofday.icall$2(timeval, 0));
   int start = timeval.tv_sec * 1000 + timeval.tv_usec ~/ 1000;
 
   int sleepTime = 300;
   io.sleep(sleepTime);
 
   Expect.equals(0, gettimeofday.icall$2(timeval, 0));
   int end = timeval.tv_sec * 1000 + timeval.tv_usec ~/ 1000;
   Expect.isTrue((end - start) >= sleepTime);
   timeval.free();
 }