Make ProcessWatcher use kqueues on Mac.

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 353 matching lines @@
  public:
   inline void operator()(FILE* x) const {
     if (x) {
       fclose(x);
     }
   }
 };
 
 typedef scoped_ptr_malloc<FILE, ScopedFILEClose> ScopedFILE;
 
+#if defined(OS_POSIX)
+// A class to handle auto-closing of FDs.
+class ScopedFDClose {
+ public:
+  inline void operator()(int* x) const {
+    if (x) {
+      close(*x);
+    }
+  }
+};
+
+typedef scoped_ptr_malloc<int, ScopedFDClose> ScopedFD;
+#endif  // OS_POSIX
+
 // A class for enumerating the files in a provided path. The order of the
 // results is not guaranteed.
 //
 // DO NOT USE FROM THE MAIN THREAD of your application unless it is a test
 // program where latency does not matter. This class is blocking.
 class FileEnumerator {
  public:
 #if defined(OS_WIN)
   typedef WIN32_FIND_DATA FindInfo;
 #elif defined(OS_POSIX)
@@ skipping 145 matching lines @@
     const FilePath& source_file_path,
     const FilePath& target_file_path);
 
 // Returns whether the file has been modified since a particular date.
 bool HasFileBeenModifiedSince(const FileEnumerator::FindInfo& find_info,
                               const base::Time& cutoff_time);
 
 }  // namespace file_util
 
 #endif  // BASE_FILE_UTIL_H_