DON'T USE THIS -- Providing some missing POSIX File syscalls.

src/trusted/desc/nacl_desc_custom.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.
  */
 
 #include "native_client/src/trusted/desc/nacl_desc_custom.h"
 
 #include "native_client/src/shared/platform/nacl_check.h"
 #include "native_client/src/trusted/desc/nacl_desc_base.h"
@@ skipping 58 matching lines @@
     NaClDescCustomDtor,  /* diff */
   },
   NaClDescMapNotImplemented,
   NACL_DESC_UNMAP_NOT_IMPLEMENTED
   NaClDescReadNotImplemented,
   NaClDescWriteNotImplemented,
   NaClDescSeekNotImplemented,
   NaClDescPReadNotImplemented,
   NaClDescPWriteNotImplemented,
   NaClDescFstatNotImplemented,
+  NaClDescFchdirNotImplemented,
+  NaClDescFchmodNotImplemented,
+  NaClDescFsyncNotImplemented,
+  NaClDescFdatasyncNotImplemented,
+  NaClDescFtruncateNotImplemented,
   NaClDescGetdentsNotImplemented,
   NaClDescExternalizeSizeNotImplemented,
   NaClDescExternalizeNotImplemented,
   NaClDescLockNotImplemented,
   NaClDescTryLockNotImplemented,
   NaClDescUnlockNotImplemented,
   NaClDescWaitNotImplemented,
   NaClDescTimedWaitAbsNotImplemented,
   NaClDescSignalNotImplemented,
   NaClDescBroadcastNotImplemented,
   NaClDescCustomSendMsg,  /* diff */
   NaClDescCustomRecvMsg,  /* diff */
   NaClDescLowLevelSendMsgNotImplemented,
   NaClDescLowLevelRecvMsgNotImplemented,
   NaClDescConnectAddrNotImplemented,
   NaClDescAcceptConnNotImplemented,
   NaClDescPostNotImplemented,
   NaClDescSemWaitNotImplemented,
   NaClDescGetValueNotImplemented,
   NaClDescSetMetadata,
   NaClDescGetMetadata,
   NaClDescSetFlags,
   NaClDescGetFlags,
   NaClDescIsattyNotImplemented,
   NACL_DESC_CUSTOM,  /* diff */
 };