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

native_client_sdk/src/libraries/nacl_io/kernel_intercept.cc

 // Copyright (c) 2012 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.
 
 #include "nacl_io/kernel_intercept.h"
 
 #include <assert.h>
 #include <errno.h>
 #include <string.h>
 
@@ skipping 203 matching lines @@
              const void* data) {
   ON_NOSYS_RETURN(-1);
   return s_state.kp->mount(source, target, filesystemtype, mountflags, data);
 }
 
 int ki_umount(const char* path) {
   ON_NOSYS_RETURN(-1);
   return s_state.kp->umount(path);
 }
 
-int ki_open(const char* path, int oflag) {
+int ki_open(const char* path, int oflag, mode_t mode) {
   ON_NOSYS_RETURN(-1);
-  return s_state.kp->open(path, oflag);
+  return s_state.kp->open(path, oflag, mode);
 }
 
 int ki_pipe(int pipefds[2]) {
   ON_NOSYS_RETURN(-1);
   return s_state.kp->pipe(pipefds);
 }
 
 ssize_t ki_read(int fd, void* buf, size_t nbyte) {
   ON_NOSYS_RETURN(-1);
   return s_state.kp->read(fd, buf, nbyte);
@@ skipping 346 matching lines @@
 int ki_socket(int domain, int type, int protocol) {
   ON_NOSYS_RETURN(-1);
   return s_state.kp->socket(domain, type, protocol);
 }
 
 int ki_socketpair(int domain, int type, int protocol, int* sv) {
   ON_NOSYS_RETURN(-1);
   return s_state.kp->socketpair(domain, type, protocol, sv);
 }
 #endif  // PROVIDES_SOCKET_API