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annotate unix.py @ 108:218b8c28549c

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Fixed a crash due to SIGCHLD interrupting validator output pipe reads
author Oleg Oshmyan <chortos@inbox.lv>
date Fri, 08 Apr 2011 19:24:51 +0300
parents 995502cdafc6
children 16fe21d6582e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # Copyright (c) 2010-2011 Chortos-2 <chortos@inbox.lv>
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2
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3 from __future__ import division, with_statement
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4
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c62c9bfd614a Removed import_error
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5 from compat import *
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6 import testcases # mutual import
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7
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8 from subprocess import Popen
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8cd7a732f2f3 Fixed a crash in the unix module
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9 import os, sys, time
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10
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11 try:
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12 from testcases import clock
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13 except ImportError:
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14 if sys.platform.startswith('java'):
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15 from time import clock
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16 else:
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17 from time import time as clock
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18
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19 try:
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20 from signal import SIGTERM, SIGKILL
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21 except ImportError:
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22 SIGTERM = 15
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23 SIGKILL = 9
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24
85
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25 __all__ = 'call', 'kill', 'terminate', 'pause', 'clock'
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26
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27
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28 if not sys.stdin.isatty():
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29 pause = lambda: sys.stdin.read(1)
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30 catch_escape = False
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31 else:
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32 try:
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33 from select import select
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34 import termios, tty, atexit
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35 except ImportError:
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36 pause = None
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37 catch_escape = False
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38 else:
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39 catch_escape = True
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40 def cleanup(old=termios.tcgetattr(sys.stdin.fileno())):
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41 termios.tcsetattr(sys.stdin.fileno(), termios.TCSAFLUSH, old)
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42 atexit.register(cleanup)
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43 tty.setcbreak(sys.stdin.fileno())
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44 def pause():
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45 sys.stdin.read(1)
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46
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47 try:
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48 from signal import SIGCHLD, signal, SIG_DFL
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49 from select import select, error as SelectError
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50 from errno import EINTR
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51 from fcntl import fcntl, F_SETFD, F_GETFD
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52 try:
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53 import cPickle as pickle
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54 except ImportError:
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55 import pickle
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56 except ImportError:
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57 def call(*args, **kwargs):
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58 case = kwargs.pop('case')
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59 try:
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60 case.process = Popen(*args, **kwargs)
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61 except OSError:
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62 raise testcases.CannotStartTestee(sys.exc_info()[1])
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63 case.time_started = clock()
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64 if not case.maxwalltime:
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65 while True:
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66 exitcode, now = case.process.poll(), clock()
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67 if exitcode is not None:
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68 case.time_stopped = now
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69 break
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70 else:
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71 time.sleep(.001)
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72 else:
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73 time_end = case.time_started + case.maxwalltime
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74 while True:
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75 exitcode, now = case.process.poll(), clock()
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76 if exitcode is not None:
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77 case.time_stopped = now
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78 break
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79 elif now >= time_end:
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80 raise TimeLimitExceeded
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81 else:
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82 time.sleep(.001)
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83 else:
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84 try:
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85 from fcntl import FD_CLOEXEC
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86 except ImportError:
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87 FD_CLOEXEC = 1
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88
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89 try:
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90 from resource import getrusage, RUSAGE_SELF, RUSAGE_CHILDREN
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91 except ImportError:
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92 from time import clock as cpuclock
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93 getrusage = lambda who: None
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94 else:
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95 def cpuclock():
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96 rusage = getrusage(RUSAGE_SELF)
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97 return rusage.ru_utime + rusage.ru_stime
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98
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99 try:
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100 from resource import setrlimit
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101 try:
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102 from resource import RLIMIT_AS
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103 except ImportError:
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104 from resource import RLIMIT_VMEM
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105 except ImportError:
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106 setrlimit = None
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107
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108 # Make SIGCHLD interrupt sleep() and select()
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109 def bury_child(signum, frame):
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110 try:
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111 bury_child.case.time_stopped = clock()
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112 except Exception:
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113 pass
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114 signal(SIGCHLD, bury_child)
108
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115 class SignalIgnorer(object):
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116 def __enter__(self):
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117 signal(SIGCHLD, SIG_DFL)
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118 def __exit__(self, exc_type, exc_value, traceback):
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119 signal(SIGCHLD, bury_child)
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120 signal_ignorer = SignalIgnorer()
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121 __all__ += 'signal_ignorer',
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122
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123 # If you want this to work portably, don't set any stdio argument to PIPE
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124 def call(*args, **kwargs):
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125 global last_rusage
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126 bury_child.case = case = kwargs.pop('case')
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127 read, write = os.pipe()
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128 fcntl(write, F_SETFD, fcntl(write, F_GETFD) | FD_CLOEXEC)
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129 def preexec_fn():
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130 os.close(read)
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131 if setrlimit and case.maxmemory:
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132 maxmemory = ceil(case.maxmemory * 1048576)
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133 setrlimit(RLIMIT_AS, (maxmemory, maxmemory))
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134 # I would also set a CPU time limit but I do not want the time
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135 # passing between the calls to fork and exec to be counted in
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136 os.write(write, pickle.dumps((clock(), cpuclock()), 1))
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137 kwargs['preexec_fn'] = preexec_fn
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138 old_rusage = getrusage(RUSAGE_CHILDREN)
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139 last_rusage = None
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140 try:
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141 case.process = Popen(*args, **kwargs)
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142 except OSError:
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143 os.close(read)
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144 raise testcases.CannotStartTestee(sys.exc_info()[1])
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145 finally:
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146 os.close(write)
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147 try:
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148 if not catch_escape:
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149 if case.maxwalltime:
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150 time.sleep(case.maxwalltime)
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151 if case.process.poll() is None:
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152 raise testcases.WallTimeLimitExceeded
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153 else:
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154 case.process.wait()
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155 else:
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156 if not case.maxwalltime:
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157 try:
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158 while case.process.poll() is None:
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159 if select((sys.stdin,), (), ())[0]:
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160 if sys.stdin.read(1) == '\33':
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161 raise testcases.CanceledByUser
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162 except SelectError:
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163 if sys.exc_info()[1].args[0] != EINTR:
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164 raise
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165 else:
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166 case.process.poll()
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167 else:
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168 time_end = clock() + case.maxwalltime
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169 try:
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170 while case.process.poll() is None:
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171 remaining = time_end - clock()
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172 if remaining > 0:
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173 if select((sys.stdin,), (), (), remaining)[0]:
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174 if sys.stdin.read(1) == '\33':
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175 raise testcases.CanceledByUser
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176 else:
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177 raise testcases.WallTimeLimitExceeded
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178 except SelectError:
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179 if sys.exc_info()[1].args[0] != EINTR:
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180 raise
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181 else:
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182 case.process.poll()
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183 finally:
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184 case.time_started, cpustart = pickle.loads(os.read(read, 512))
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185 os.close(read)
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diff changeset
186 del bury_child.case
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187 new_rusage = getrusage(RUSAGE_CHILDREN)
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diff changeset
188 if new_rusage and (case.maxcputime or not case.maxwalltime):
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diff changeset
189 case.time_started = cpustart
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190 case.time_stopped = new_rusage.ru_utime + new_rusage.ru_stime
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diff changeset
191 case.time_limit_string = case.cpu_time_limit_string
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diff changeset
192 if case.maxcputime and new_rusage:
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diff changeset
193 oldtime = old_rusage.ru_utime + old_rusage.ru_stime
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diff changeset
194 newtime = new_rusage.ru_utime + new_rusage.ru_stime
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195 if newtime - oldtime - cpustart > case.maxcputime:
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diff changeset
196 raise testcases.CPUTimeLimitExceeded
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diff changeset
197 if case.maxmemory:
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diff changeset
198 if sys.platform != 'darwin':
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diff changeset
199 maxrss = case.maxmemory * 1024
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diff changeset
200 else:
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diff changeset
201 maxrss = case.maxmemory * 1048576
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diff changeset
202 if last_rusage and last_rusage.ru_maxrss > maxrss:
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parents:
diff changeset
203 raise testcases.MemoryLimitExceeded
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parents:
diff changeset
204 elif (new_rusage and
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parents:
diff changeset
205 new_rusage.ru_maxrss > old_rusage.ru_maxrss and
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parents:
diff changeset
206 new_rusage.ru_maxrss > maxrss):
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diff changeset
207 raise testcases.MemoryLimitExceeded
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parents:
diff changeset
208
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diff changeset
209 # Emulate memory limits on platforms compatible with 4.3BSD but not XSI
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diff changeset
210 # I say 'emulate' because the OS will allow excessive memory usage
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diff changeset
211 # anyway; Upreckon will just treat the test case as not passed.
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diff changeset
212 # To do this, we not only require os.wait4 to be present but also
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diff changeset
213 # assume things about the implementation of subprocess.Popen.
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parents:
diff changeset
214 try:
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parents:
diff changeset
215 def waitpid_emu(pid, options, _wait4=os.wait4):
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parents:
diff changeset
216 global last_rusage
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diff changeset
217 pid, status, last_rusage = _wait4(pid, options)
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parents:
diff changeset
218 return pid, status
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parents:
diff changeset
219 _waitpid = os.waitpid
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diff changeset
220 os.waitpid = waitpid_emu
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parents:
diff changeset
221 try:
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parents:
diff changeset
222 defaults = Popen._internal_poll.__func__.__defaults__
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parents:
diff changeset
223 except AttributeError:
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parents:
diff changeset
224 # Python 2.5
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diff changeset
225 defaults = Popen._internal_poll.im_func.func_defaults
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parents:
diff changeset
226 i = defaults.index(_waitpid)
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parents:
diff changeset
227 defaults = defaults[:i] + (waitpid_emu,) + defaults[i+1:]
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parents:
diff changeset
228 try:
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diff changeset
229 Popen._internal_poll.__func__.__defaults__ = defaults
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parents:
diff changeset
230 except AttributeError:
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parents:
diff changeset
231 # Python 2.5 again
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diff changeset
232 Popen._internal_poll.im_func.func_defaults = defaults
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parents:
diff changeset
233 except (AttributeError, ValueError):
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Oleg Oshmyan <chortos@inbox.lv>
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diff changeset
234 pass
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parents:
diff changeset
235
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parents:
diff changeset
236
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diff changeset
237 def kill(process):
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parents:
diff changeset
238 try:
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parents:
diff changeset
239 process.kill()
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parents:
diff changeset
240 except AttributeError:
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parents:
diff changeset
241 os.kill(process.pid, SIGKILL)
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parents:
diff changeset
242
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parents:
diff changeset
243
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diff changeset
244 def terminate(process):
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parents:
diff changeset
245 try:
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parents:
diff changeset
246 process.terminate()
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parents:
diff changeset
247 except AttributeError:
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parents:
diff changeset
248 os.kill(process.pid, SIGTERM)