Implement file_util::CountFilesCreatedAfter() for posix environments....

base/file_util.h

 // Copyright (c) 2006-2008 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.
 
 // This file contains utility functions for dealing with the local
 // filesystem.
 
 #ifndef BASE_FILE_UTIL_H_
 #define BASE_FILE_UTIL_H_
 
@@ skipping 119 matching lines @@
 // file name component. Any leading or trailing whitespace in 'file_name' is
 // removed.
 // Example:
 //   file_name == "bad:file*name?.txt", changed to: "bad-file-name-.txt" when
 //   'replace_char' is '-'.
 void ReplaceIllegalCharacters(std::wstring* file_name, int replace_char);
 
 //-----------------------------------------------------------------------------
 // Functions that involve filesystem access or modification:
 
-#if defined(OS_WIN)
-// Returns the number of files matching the current path that were
 // created on or after the given |file_time|.  Doesn't count ".." or ".".
+//
+// Note for POSIX environments: a file created before |file_time|
+// can be mis-detected as a newer file due to low precision of
+// timestmap of file creation time. If you need to avoid such
+// mis-detection perfectly, you should wait one second before
+// obtaining |file_time|.
 int CountFilesCreatedAfter(const FilePath& path,
                            const base::Time& file_time);
-#endif  // defined(OS_WIN)
 
 // Deletes the given path, whether it's a file or a directory.
 // If it's a directory, it's perfectly happy to delete all of the
 // directory's contents.  Passing true to recursive deletes
 // subdirectories and their contents as well.
 // Returns true if successful, false otherwise.
 //
 // WARNING: USING THIS WITH recursive==true IS EQUIVALENT
 //          TO "rm -rf", SO USE WITH CAUTION.
 bool Delete(const FilePath& path, bool recursive);
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 // Renames a file using the SHFileOperation API to ensure that the target file
 // gets the correct default security descriptor in the new path.
 bool RenameFileAndResetSecurityDescriptor(
     const FilePath& source_file_path,
     const FilePath& target_file_path);
 
 }  // namespace file_util
 
 #endif  // BASE_FILE_UTIL_H_