Basis for cryptohome+power_SuspendResume stress test.

client/common_lib/sys_power.py

Index: client/common_lib/sys_power.py
diff --git a/client/common_lib/sys_power.py b/client/common_lib/sys_power.py
index 3ddcfee237b217f93dfc04e85c0bd6a497f0222d..56bce4c9dbf780e531aca8544457e073bf7bfc64 100644
--- a/client/common_lib/sys_power.py
+++ b/client/common_lib/sys_power.py
@@ -1,5 +1,16 @@
+#!/usr/bin/python
+
+# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Provides utility methods for controlling powerd in ChromiumOS.
+"""
+
 import os
+from autotest_lib.client.common_lib import utils
 
+SUSPEND_CMD='/usr/bin/powerd_suspend'
 
 def set_state(state):
     """
@@ -12,8 +23,8 @@ def suspend_to_ram():
     """
     Suspend the system to RAM (S3)
     """
-    if os.path.exists('/usr/bin/powerd_suspend'):
-        os.system('/usr/bin/powerd_suspend')
+    if os.path.exists(SUSPEND_CMD):
+        utils.system(SUSPEND_CMD)
     else:
         set_power_state('mem')