Getting service process on Mac to handle having things moved/changed underneath it.

base/file_util_posix.cc

 // Copyright (c) 2010 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 "base/file_util.h"
 
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <fnmatch.h>
@@ skipping 506 matching lines @@
   if (CallStat(file_path.value().c_str(), &file_info) != 0)
     return false;
   results->is_directory = S_ISDIR(file_info.st_mode);
   results->size = file_info.st_size;
   results->last_modified = base::Time::FromTimeT(file_info.st_mtime);
   results->last_accessed = base::Time::FromTimeT(file_info.st_atime);
   results->creation_time = base::Time::FromTimeT(file_info.st_ctime);
   return true;
 }
 
-bool GetInode(const FilePath& path, ino_t* inode) {
+bool AreReferringToSameObject(const FilePath& a, const FilePath& b) {
+  ino_t inode_a, inode_b;
+  dev_t dev_a, dev_b;
+  if (GetInodeAndDevice(a, &inode_a, &dev_a)) {
+    if (GetInodeAndDevice(b, &inode_b, &dev_b)) {
+      return (inode_a == inode_b) && (dev_a == dev_b);
+    }
+  }
+  return false;
+}
+  
+bool GetInodeAndDevice(const FilePath& path, ino_t* inode, dev_t* dev) {
   base::ThreadRestrictions::AssertIOAllowed();  // For call to stat().
   struct stat buffer;
   int result = stat(path.value().c_str(), &buffer);
   if (result < 0)
     return false;
-
+    
+  *dev = buffer.st_dev;
   *inode = buffer.st_ino;
   return true;
 }
 
 FILE* OpenFile(const std::string& filename, const char* mode) {
   return OpenFile(FilePath(filename), mode);
 }
 
 FILE* OpenFile(const FilePath& filename, const char* mode) {
   base::ThreadRestrictions::AssertIOAllowed();
@@ skipping 337 matching lines @@
   if (HANDLE_EINTR(close(infile)) < 0)
     result = false;
   if (HANDLE_EINTR(close(outfile)) < 0)
     result = false;
 
   return result;
 }
 #endif  // defined(OS_MACOSX)
 
 }  // namespace file_util