Add comment in NativeMessageProcessHost::HandleReadResult()

chrome/browser/extensions/api/messaging/native_message_process_host.cc

 // Copyright (c) 2012 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 "chrome/browser/extensions/api/messaging/native_message_process_host.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/platform_file.h"
@@ skipping 230 matching lines @@
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
 
   if (closed_)
     return;
 
   if (result > 0) {
     ProcessIncomingData(read_buffer_->data(), result);
   } else if (result == net::ERR_IO_PENDING) {
     read_pending_ = true;
   } else if (result == 0 || result == net::ERR_CONNECTION_RESET) {
+    // On Windows we get net::ERR_CONNECTION_RESET for a broken pipe, while on
+    // Posix read() returns 0 in that case.
     Close(kNativeHostExited);
   } else {
     LOG(ERROR) << "Error when reading from Native Messaging host: " << result;
     Close(kHostInputOuputError);
   }
 }
 
 void NativeMessageProcessHost::ProcessIncomingData(
     const char* data, int data_size) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::IO));
@@ skipping 81 matching lines @@
     closed_ = true;
     read_stream_.reset();
     write_stream_.reset();
     content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
         base::Bind(&Client::CloseChannel, weak_client_ui_,
                    destination_port_, error_message));
   }
 }
 
 }  // namespace extensions