Mac: ensure child processes are properly reaped -- eliminate Helper zombies.

chrome/common/process_watcher_unittest.cc

 // Copyright (c) 2009 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/common/process_watcher.h"
 
 #if defined(OS_POSIX)
 #include <sys/wait.h>
 
 #include "base/eintr_wrapper.h"
@@ skipping 21 matching lines @@
       SpawnChild(L"process_watcher_test_never_die");
   ProcessWatcher::EnsureProcessTerminated(child_process);
   base::WaitForSingleProcess(child_process, 5000);
 
   // Check that process was really killed.
   EXPECT_TRUE(IsProcessDead(child_process));
   base::CloseProcessHandle(child_process);
 }
 
 MULTIPROCESS_TEST_MAIN(process_watcher_test_never_die) {
-  while(1){
+  while (1) {
     sleep(500);
   }
   return 0;
 }
 
+TEST_F(ProcessWatcherTest, ImmediateTermination) {
+  base::ProcessHandle child_process =
+      SpawnChild(L"process_watcher_test_die_immediately");
+  // Give it time to die.
+  sleep(2);
+  ProcessWatcher::EnsureProcessTerminated(child_process);
+
+  // Check that process was really killed.
+  EXPECT_TRUE(IsProcessDead(child_process));
+  base::CloseProcessHandle(child_process);
+}
+
+MULTIPROCESS_TEST_MAIN(process_watcher_test_die_immediately) {
+  return 0;
+}
+
 #endif  // OS_POSIX