build/android/host_heartbeat.py

   1 #!/usr/bin/env python
   2 #
   3 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
   4 # Use of this source code is governed by a BSD-style license that can be
   5 # found in the LICENSE file.
   6
   7 """Sends a heart beat pulse to the currently online Android devices.
   8 This heart beat lets the devices know that they are connected to a host.
   9 """
  10 # pylint: disable=W0702
  11
  12 import sys
  13 import time
  14
  15 from pylib import android_commands
  16 from pylib.device import device_utils
  17
  18 PULSE_PERIOD = 20
  19
  20 def main():
  21   while True:
  22     try:
  23       devices = android_commands.GetAttachedDevices()
  24       for device_serial in devices:
  25         device_utils.DeviceUtils(device_serial).RunShellCommand(
  26             'touch /sdcard/host_heartbeat')
  27     except:
  28       # Keep the heatbeat running bypassing all errors.
  29       pass
  30     time.sleep(PULSE_PERIOD)
  31
  32
  33 if __name__ == '__main__':
  34   sys.exit(main())