Basis for cryptohome+power_SuspendResume stress test.

client/common_lib/sys_power.py

+#!/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):
     """
     Set the system power state to 'state'.
     """
     file('/sys/power/state', 'w').write("%s\n" % state)
 
 
 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')
 
 
 def suspend_to_disk():
     """
     Suspend the system to disk (S4)
     """
     set_power_state('disk')
 
 def standby():
     """
     Power-on suspend (S1)
     """
     set_power_state('standby')