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# Copyright (c) 2015 Stephen Warren
# Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
#
# SPDX-License-Identifier: GPL-2.0
# Logic to interact with the sandbox port of U-Boot, running as a sub-process.
import time
from u_boot_spawn import Spawn
from u_boot_console_base import ConsoleBase
class ConsoleSandbox(ConsoleBase):
'''Represents a connection to a sandbox U-Boot console, executed as a sub-
process.'''
def __init__(self, log, config):
'''Initialize a U-Boot console connection.
Args:
log: A multiplexed_log.Logfile instance.
config: A "configuration" object as defined in conftest.py.
Returns:
Nothing.
'''
super(ConsoleSandbox, self).__init__(log, config, max_fifo_fill=1024)
def get_spawn(self):
'''Connect to a fresh U-Boot instance.
A new sandbox process is created, so that U-Boot begins running from
scratch.
Args:
None.
Returns:
A u_boot_spawn.Spawn object that is attached to U-Boot.
'''
return Spawn([self.config.build_dir + '/u-boot'])
def kill(self, sig):
'''Send a specific Unix signal to the sandbox process.
Args:
sig: The Unix signal to send to the process.
Returns:
Nothing.
'''
self.ensure_spawned()
self.log.action('kill %d' % sig)
self.p.kill(sig)
def validate_exited(self):
'''Determine whether the sandbox process has exited.
If required, this function waits a reasonable time for the process to
exit.
Args:
None.
Returns:
Boolean indicating whether the process has exited.
'''
p = self.p
self.p = None
for i in xrange(100):
ret = not p.isalive()
if ret:
break
time.sleep(0.1)
p.close()
return ret
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