Provides some of the missing POSIX file syscalls

src/trusted/desc/nacl_desc_base.h

 /*
  * 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.  I/O Descriptor / Handle abstraction.
  */
 
@@ skipping 211 matching lines @@
    * Also, request determines arg size and whether it is an input or
    * output arg!
    */
   int (*Ioctl)(struct NaClDesc  *vself,
                int              request,
                void             *arg) NACL_WUR;
 
   int (*Fstat)(struct NaClDesc      *vself,
                struct nacl_abi_stat *statbuf);
 
+  int (*Fchdir)(struct NaClDesc *vself) NACL_WUR;
+
+  int (*Fchmod)(struct NaClDesc *vself,
+                int             mode) NACL_WUR;
+
+  int (*Fsync)(struct NaClDesc *vself) NACL_WUR;
+
+  int (*Fdatasync)(struct NaClDesc *vself) NACL_WUR;
+
+  int (*Ftruncate)(struct NaClDesc  *vself,
+                   nacl_abi_off_t   length) NACL_WUR;
+
   /*
    * Directory access support.  Directories require support for getdents.
    */
   ssize_t (*Getdents)(struct NaClDesc *vself,
                       void            *dirp,
                       size_t          count) NACL_WUR;
 
   /*
    * Externalization queries this for how many data bytes and how many
    * handles are needed to transfer the "this" or "self" descriptor
@@ skipping 355 matching lines @@
                                      size_t len,
                                      nacl_off64_t offset);
 
 int NaClDescIoctlNotImplemented(struct NaClDesc *vself,
                                 int             request,
                                 void            *arg);
 
 int NaClDescFstatNotImplemented(struct NaClDesc       *vself,
                                 struct nacl_abi_stat  *statbuf);
 
+int NaClDescFchdirNotImplemented(struct NaClDesc *vself);
+
+int NaClDescFchmodNotImplemented(struct NaClDesc *vself,
+                                 int             mode);
+
+int NaClDescFsyncNotImplemented(struct NaClDesc *vself);
+
+int NaClDescFdatasyncNotImplemented(struct NaClDesc *vself);
+
+int NaClDescFtruncateNotImplemented(struct NaClDesc  *vself,
+                                    nacl_abi_off_t   length);
+
 ssize_t NaClDescGetdentsNotImplemented(struct NaClDesc  *vself,
                                        void             *dirp,
                                        size_t           count);
 
 int NaClDescExternalizeSizeNotImplemented(struct NaClDesc *vself,
                                           size_t          *nbytes,
                                           size_t          *nhandles);
 
 int NaClDescExternalizeNotImplemented(struct NaClDesc          *vself,
                                       struct NaClDescXferState *xfer);
@@ skipping 54 matching lines @@
     struct NaClDescQuotaInterface  *quota_interface);
 
 
 int NaClSafeCloseNaClHandle(NaClHandle h);
 
 int NaClDescIsSafeForMmap(struct NaClDesc *vself);
 
 EXTERN_C_END
 
 #endif  // NATIVE_CLIENT_SRC_TRUSTED_DESC_NACL_DESC_BASE_H_