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 8import time 9from u_boot_spawn import Spawn 10from u_boot_console_base import ConsoleBase 11 12class 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 return Spawn([self.config.build_dir + '/u-boot']) 43 44 def kill(self, sig): 45 '''Send a specific Unix signal to the sandbox process. 46 47 Args: 48 sig: The Unix signal to send to the process. 49 50 Returns: 51 Nothing. 52 ''' 53 54 self.log.action('kill %d' % sig) 55 self.p.kill(sig) 56 57 def validate_exited(self): 58 '''Determine whether the sandbox process has exited. 59 60 If required, this function waits a reasonable time for the process to 61 exit. 62 63 Args: 64 None. 65 66 Returns: 67 Boolean indicating whether the process has exited. 68 ''' 69 70 p = self.p 71 self.p = None 72 for i in xrange(100): 73 ret = not p.isalive() 74 if ret: 75 break 76 time.sleep(0.1) 77 p.close() 78 return ret 79