workaround for mac kernel bug

ipc/file_descriptor_set_posix.cc

 // 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.
 
 #include "ipc/file_descriptor_set_posix.h"
 
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
 
@@ skipping 108 matching lines @@
   for (std::vector<base::FileDescriptor>::iterator
        i = descriptors_.begin(); i != descriptors_.end(); ++i) {
     if (i->auto_close)
       if (HANDLE_EINTR(close(i->fd)) < 0)
         PLOG(ERROR) << "close";
   }
   descriptors_.clear();
   consumed_descriptor_highwater_ = 0;
 }
 
+void FileDescriptorSet::ReleaseFDsToClose(std::vector<int>* fds) {
+  for (std::vector<base::FileDescriptor>::iterator
+       i = descriptors_.begin(); i != descriptors_.end(); ++i) {
+    if (i->auto_close)
+      fds->push_back(i->fd);
+  }
+  descriptors_.clear();
+  consumed_descriptor_highwater_ = 0;
+}
+
 void FileDescriptorSet::SetDescriptors(const int* buffer, unsigned count) {
   DCHECK(count <= kMaxDescriptorsPerMessage);
   DCHECK_EQ(descriptors_.size(), 0u);
   DCHECK_EQ(consumed_descriptor_highwater_, 0u);
 
   descriptors_.reserve(count);
   for (unsigned i = 0; i < count; ++i) {
     struct base::FileDescriptor sd;
     sd.fd = buffer[i];
     sd.auto_close = true;
     descriptors_.push_back(sd);
   }
 }