workaround for mac kernel bug

ipc/file_descriptor_set_posix.h

 // Copyright (c) 2011 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.
 
 #ifndef IPC_FILE_DESCRIPTOR_SET_POSIX_H_
 #define IPC_FILE_DESCRIPTOR_SET_POSIX_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 59 matching lines @@
   // must be called after these descriptors have been transmitted.
   //   buffer: (output) a buffer of, at least, size() integers.
   void GetDescriptors(int* buffer) const;
   // This must be called after transmitting the descriptors returned by
   // GetDescriptors. It marks all the descriptors as consumed and closes those
   // which are auto-close.
   void CommitAll();
   // Returns true if any contained file descriptors appear to be handles to a
   // directory.
   bool ContainsDirectoryDescriptor() const;
+  // Fetch all filedescriptors with the "auto close" property.
+  // Used instead of CommitAll() when closing must be handled manually.
+  void ReleaseFDsToClose(std::vector<int>* fds);
 
   // ---------------------------------------------------------------------------
 
 
   // ---------------------------------------------------------------------------
   // Interfaces for receiving...
 
   // Set the contents of the set from the given buffer. This set must be empty
   // before calling. The auto-close flag is set on all the descriptors so that
   // unconsumed descriptors are closed on destruction.
@@ skipping 15 matching lines @@
   // This contains the index of the next descriptor which should be consumed.
   // It's used in a couple of ways. Firstly, at destruction we can check that
   // all the descriptors have been read (with GetNthDescriptor). Secondly, we
   // can check that they are read in order.
   mutable unsigned consumed_descriptor_highwater_;
 
   DISALLOW_COPY_AND_ASSIGN(FileDescriptorSet);
 };
 
 #endif  // IPC_FILE_DESCRIPTOR_SET_POSIX_H_