Report exit status in debug stub, if tab is closed in chrome.

src/trusted/service_runtime/nacl_secure_service.c

 /*
  * Copyright (c) 2012 The Native Client 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 "native_client/src/trusted/service_runtime/nacl_secure_service.h"
 
 #include "native_client/src/shared/platform/nacl_exit.h"
 #include "native_client/src/shared/platform/nacl_log.h"
@@ skipping 83 matching lines @@
     struct NaClSecureService *self) {
   NaClLog(5, "NaClSecureServiceThreadCountDecr\n");
   NaClXMutexLock(&self->mu);
   if (0 == self->conn_count) {
     NaClLog(LOG_FATAL,
             "NaClSecureServiceThreadCountDecr: "
             "decrementing thread count when count is zero\n");
   }
   if (0 == --self->conn_count) {
     NaClLog(4, "NaClSecureServiceThread: all channels closed, exiting.\n");
-    NaClExit(0);
+    /*
+     * Set exit code for application.  This wakes up main thread and
+     * application will terminate gracefully there.  This is needed to allow
+     * debug stub to send exit status to debugger.  This way we can detect
+     * normal NaCl module exit in tests.
+     */
+    NaClReportExitStatus(self->nap, 0);
   }
   NaClXMutexUnlock(&self->mu);
 }
 
 int NaClSecureServiceAcceptConnection(
     struct NaClSimpleService            *vself,
     struct NaClSimpleServiceConnection  **vconn) {
   struct NaClSecureService *self =
     (struct NaClSecureService *) vself;
   int status;
@@ skipping 215 matching lines @@
 
 struct NaClSecureReverseClientVtbl const kNaClSecureReverseClientVtbl = {
   {
     {
       NaClSecureReverseClientDtor,
     },
   },
   NaClSecureReverseClientInsertHandler,
   NaClSecureReverseClientRemoveHandler,
 };