test/py/u_boot_console_sandbox.py

   1 # Copyright (c) 2015 Stephen Warren
   2 # Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
   3 #
   4 # SPDX-License-Identifier: GPL-2.0
   5
   6 # Logic to interact with the sandbox port of U-Boot, running as a sub-process.
   7
   8 import time
   9 from u_boot_spawn import Spawn
  10 from u_boot_console_base import ConsoleBase
  11
  12 class ConsoleSandbox(ConsoleBase):
  13     """Represents a connection to a sandbox U-Boot console, executed as a sub-
  14     process."""
  15
  16     def __init__(self, log, config):
  17         """Initialize a U-Boot console connection.
  18
  19         Args:
  20             log: A multiplexed_log.Logfile instance.
  21             config: A "configuration" object as defined in conftest.py.
  22
  23         Returns:
  24             Nothing.
  25         """
  26
  27         super(ConsoleSandbox, self).__init__(log, config, max_fifo_fill=1024)
  28
  29     def get_spawn(self):
  30         """Connect to a fresh U-Boot instance.
  31
  32         A new sandbox process is created, so that U-Boot begins running from
  33         scratch.
  34
  35         Args:
  36             None.
  37
  38         Returns:
  39             A u_boot_spawn.Spawn object that is attached to U-Boot.
  40         """
  41
  42         cmd = [
  43             self.config.build_dir + '/u-boot',
  44             '-d',
  45             self.config.build_dir + '/arch/sandbox/dts/test.dtb'
  46         ]
  47         return Spawn(cmd)
  48
  49     def kill(self, sig):
  50         """Send a specific Unix signal to the sandbox process.
  51
  52         Args:
  53             sig: The Unix signal to send to the process.
  54
  55         Returns:
  56             Nothing.
  57         """
  58
  59         self.log.action('kill %d' % sig)
  60         self.p.kill(sig)
  61
  62     def validate_exited(self):
  63         """Determine whether the sandbox process has exited.
  64
  65         If required, this function waits a reasonable time for the process to
  66         exit.
  67
  68         Args:
  69             None.
  70
  71         Returns:
  72             Boolean indicating whether the process has exited.
  73         """
  74
  75         p = self.p
  76         self.p = None
  77         for i in xrange(100):
  78             ret = not p.isalive()
  79             if ret:
  80                 break
  81             time.sleep(0.1)
  82         p.close()
  83         return ret