Provides some of the missing POSIX file syscalls

src/trusted/desc/nacl_desc_invalid.c

 /*
  * Copyright (c) 2012 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /*
  * NaCl Service Runtime.  Directory descriptor abstraction.
  */
 
@@ skipping 44 matching lines @@
   },
   NaClDescMapNotImplemented,
   NACL_DESC_UNMAP_NOT_IMPLEMENTED
   NaClDescReadNotImplemented,
   NaClDescWriteNotImplemented,
   NaClDescSeekNotImplemented,
   NaClDescPReadNotImplemented,
   NaClDescPWriteNotImplemented,
   NaClDescIoctlNotImplemented,
   NaClDescFstatNotImplemented,
+  NaClDescFchdirNotImplemented,
+  NaClDescFchmodNotImplemented,
+  NaClDescFsyncNotImplemented,
+  NaClDescFdatasyncNotImplemented,
+  NaClDescFtruncateNotImplemented,
   NaClDescGetdentsNotImplemented,
   NaClDescInvalidExternalizeSize,
   NaClDescInvalidExternalize,
   NaClDescLockNotImplemented,
   NaClDescTryLockNotImplemented,
   NaClDescUnlockNotImplemented,
   NaClDescWaitNotImplemented,
   NaClDescTimedWaitAbsNotImplemented,
   NaClDescSignalNotImplemented,
   NaClDescBroadcastNotImplemented,
@@ skipping 70 matching lines @@
 int NaClDescInvalidInternalize(struct NaClDesc               **baseptr,
                                struct NaClDescXferState      *xfer,
                                struct NaClDescQuotaInterface *quota_interface) {
   UNREFERENCED_PARAMETER(xfer);
   UNREFERENCED_PARAMETER(quota_interface);
 
   *baseptr = (struct NaClDesc *) NaClDescInvalidMake();
 
   return 0;
 }