u_boot_console_sandbox.py 1.9 KB

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  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. # Logic to interact with the sandbox port of U-Boot, running as a sub-process.
  6. import time
  7. from u_boot_spawn import Spawn
  8. from u_boot_console_base import ConsoleBase
  9. class ConsoleSandbox(ConsoleBase):
  10. '''Represents a connection to a sandbox U-Boot console, executed as a sub-
  11. process.'''
  12. def __init__(self, log, config):
  13. '''Initialize a U-Boot console connection.
  14. Args:
  15. log: A multiplexed_log.Logfile instance.
  16. config: A "configuration" object as defined in conftest.py.
  17. Returns:
  18. Nothing.
  19. '''
  20. super(ConsoleSandbox, self).__init__(log, config, max_fifo_fill=1024)
  21. def get_spawn(self):
  22. '''Connect to a fresh U-Boot instance.
  23. A new sandbox process is created, so that U-Boot begins running from
  24. scratch.
  25. Args:
  26. None.
  27. Returns:
  28. A u_boot_spawn.Spawn object that is attached to U-Boot.
  29. '''
  30. return Spawn([self.config.build_dir + '/u-boot'])
  31. def kill(self, sig):
  32. '''Send a specific Unix signal to the sandbox process.
  33. Args:
  34. sig: The Unix signal to send to the process.
  35. Returns:
  36. Nothing.
  37. '''
  38. self.ensure_spawned()
  39. self.log.action('kill %d' % sig)
  40. self.p.kill(sig)
  41. def validate_exited(self):
  42. '''Determine whether the sandbox process has exited.
  43. If required, this function waits a reasonable time for the process to
  44. exit.
  45. Args:
  46. None.
  47. Returns:
  48. Boolean indicating whether the process has exited.
  49. '''
  50. p = self.p
  51. self.p = None
  52. for i in xrange(100):
  53. ret = not p.isalive()
  54. if ret:
  55. break
  56. time.sleep(0.1)
  57. p.close()
  58. return ret