Plumbing though mode parameter to open, since fusefs can make use of it.

native_client_sdk/src/libraries/nacl_io/kernel_wrap_dummy.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // The Chromium build system defines __linux__ even for native client builds,
 // so guard against __native_client__ being defined as well.
 #if defined(WIN32) || (defined(__linux__) && !defined(__native_client__))
 
 #include <errno.h>
 
@@ skipping 30 matching lines @@
                int flags,
                int fd,
                off_t offset) {
   return ENOSYS;
 }
 
 int _real_munmap(void* addr, size_t length) {
   return ENOSYS;
 }
 
-int _real_open(const char* pathname, int oflag, mode_t cmode, int* newfd) {
+int _real_open(const char* pathname, int oflag, mode_t mode, int* newfd) {
   return ENOSYS;
 }
 
 int _real_open_resource(const char* file, int* fd) {
   return ENOSYS;
 }
 
 int _real_read(int fd, void* buf, size_t count, size_t* nread) {
   *nread = count;
   return 0;
@@ skipping 26 matching lines @@
 // so guard against __native_client__ being defined as well.
 #if defined(__linux__) && !defined(__native_client__)
 
 void kernel_wrap_init() {
 }
 
 void kernel_wrap_uninit() {
 }
 
 #endif