1#!/usr/bin/python 2# 3# Copyright (c) 2015 The Chromium OS 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 7import os 8import re 9 10from autotest_lib.client.bin import test 11from autotest_lib.client.common_lib import error 12 13 14class kernel_sysrq_info(test.test): 15 """ 16 Verify the Magic SysRq show-* commands 17 (i.e. don't verify reBoot, Crash, kill-all-tasks, etc.) 18 """ 19 version = 1 20 21 def sysrq_trigger(self, key): 22 """ 23 Trigger one SysRq command, and return the kernel log output 24 @param key: lowercase SysRq keystroke (e.g. 'm') 25 @return dmesg log from running the command 26 """ 27 os.system("dmesg --clear") 28 with open("/proc/sysrq-trigger", "w") as f: 29 f.write(key + "\n") 30 with os.popen("dmesg --raw") as f: 31 return f.read() 32 33 def run_once(self): 34 test_cases = {'l': 'all active CPUs', 35 'm': '[0-9]+ pages.*RAM', 36 'p': 'Show Regs', 37 'q': 'Tick Device:', 38 't': 'init.*\s1\s', 39 'w': 'pid father' 40 } 41 42 for key in test_cases: 43 s = self.sysrq_trigger(key) 44 if re.search(test_cases[key], s) == None: 45 raise error.TestFail('Unexpected output from SysRq key %s' % 46 key) 47