[NaCk SDK] nacl_io: Don't assume ~S_IFMT are the mode bits.

native_client_sdk/src/libraries/nacl_io/node.cc

 // Copyright 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.
 
 #include "nacl_io/node.h"
 
 #include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <poll.h>
@@ skipping 171 matching lines @@
 
 Error Node::Fchmod(mode_t mode) {
   return EINVAL;
 }
 
 int Node::GetLinks() {
   return stat_.st_nlink;
 }
 
 int Node::GetMode() {
-  return stat_.st_mode & ~S_IFMT;
+  return stat_.st_mode & S_MODEBITS;
 }
 
 Error Node::GetSize(off_t* out_size) {
   *out_size = stat_.st_size;
   return 0;
 }
 
 int Node::GetType() {
   return stat_.st_mode & S_IFMT;
 }
 
 void Node::SetType(int type) {
   assert((type & ~S_IFMT) == 0);
   stat_.st_mode &= ~S_IFMT;
   stat_.st_mode |= type;
 }
 
 void Node::SetMode(int mode) {
-  assert((mode & S_IFMT) == 0);
-  stat_.st_mode &= S_IFMT;
+  assert((mode & ~S_MODEBITS) == 0);
+  stat_.st_mode &= ~S_MODEBITS;
   stat_.st_mode |= mode;
 }
 
 bool Node::IsaDir() {
   return GetType() == S_IFDIR;
 }
 
 bool Node::IsaFile() {
   return GetType() == S_IFREG;
 }
@@ skipping 25 matching lines @@
 
 void Node::Link() {
   stat_.st_nlink++;
 }
 
 void Node::Unlink() {
   stat_.st_nlink--;
 }
 
 }  // namespace nacl_io