annotate unix.py @ 122:d6fd880207cb

Fixed memory-limit-exceeded false positives on Win32
author Oleg Oshmyan <chortos@inbox.lv>
date Sun, 24 Apr 2011 16:48:29 +0100
parents 0b265fe9c81f
children 90c002c960cb
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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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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, SIG_DFL, signal, set_wakeup_fd
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49 from select import select, error as SelectError
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50 from errno import EAGAIN, EINTR
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51 from fcntl import fcntl, F_SETFD, F_GETFD, F_SETFL, F_GETFL
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52 from os import O_NONBLOCK
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53 try:
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54 import cPickle as pickle
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55 except ImportError:
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56 import pickle
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57 except ImportError:
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58 def call(*args, **kwargs):
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59 case = kwargs.pop('case')
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60 try:
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61 case.process = Popen(*args, **kwargs)
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62 except OSError:
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63 raise testcases.CannotStartTestee(sys.exc_info()[1])
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64 case.time_started = clock()
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65 if not case.maxwalltime:
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66 while True:
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67 exitcode, now = case.process.poll(), clock()
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68 if exitcode is not None:
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69 case.time_stopped = now
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70 break
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71 else:
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72 time.sleep(.001)
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73 else:
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74 time_end = case.time_started + case.maxwalltime
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75 while True:
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76 exitcode, now = case.process.poll(), clock()
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77 if exitcode is not None:
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78 case.time_stopped = now
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79 break
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80 elif now >= time_end:
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81 raise TimeLimitExceeded
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82 else:
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83 time.sleep(.001)
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84 else:
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85 try:
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86 from fcntl import FD_CLOEXEC
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87 except ImportError:
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88 FD_CLOEXEC = 1
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89
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90 try:
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91 from resource import getrusage, RUSAGE_SELF, RUSAGE_CHILDREN
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92 except ImportError:
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93 from time import clock as cpuclock
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94 getrusage = lambda who: None
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95 else:
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96 def cpuclock():
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97 rusage = getrusage(RUSAGE_SELF)
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98 return rusage.ru_utime + rusage.ru_stime
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99
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100 try:
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101 from resource import setrlimit
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102 try:
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103 from resource import RLIMIT_AS
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104 except ImportError:
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105 from resource import RLIMIT_VMEM
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106 except ImportError:
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107 setrlimit = None
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108
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109 # Make SIGCHLD interrupt sleep() and select()
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110 sigchld_pipe_read, sigchld_pipe_write = os.pipe()
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111 fcntl(sigchld_pipe_read, F_SETFL,
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112 fcntl(sigchld_pipe_read, F_GETFL) | O_NONBLOCK)
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113 fcntl(sigchld_pipe_write, F_SETFL,
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114 fcntl(sigchld_pipe_write, F_GETFL) | O_NONBLOCK)
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115 def bury_child(signum, frame):
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116 try:
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117 bury_child.case.time_stopped = clock()
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118 except Exception:
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119 pass
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120 signal(SIGCHLD, bury_child)
118
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121 set_wakeup_fd(sigchld_pipe_write)
108
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122 class SignalIgnorer(object):
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123 def __enter__(self):
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124 signal(SIGCHLD, SIG_DFL)
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125 def __exit__(self, exc_type, exc_value, traceback):
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126 signal(SIGCHLD, bury_child)
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127 signal_ignorer = SignalIgnorer()
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128 __all__ += 'signal_ignorer',
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129
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130 # If you want this to work portably, don't set any stdio argument to PIPE
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131 def call(*args, **kwargs):
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132 global last_rusage
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133 bury_child.case = case = kwargs.pop('case')
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134 read, write = os.pipe()
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135 fcntl(write, F_SETFD, fcntl(write, F_GETFD) | FD_CLOEXEC)
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136 def preexec_fn():
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137 os.close(read)
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138 if setrlimit and case.maxmemory:
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139 maxmemory = ceil(case.maxmemory * 1048576)
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140 setrlimit(RLIMIT_AS, (maxmemory, maxmemory))
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141 # I would also set a CPU time limit but I do not want the time
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142 # passing between the calls to fork and exec to be counted in
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143 os.write(write, pickle.dumps((clock(), cpuclock()), 1))
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144 kwargs['preexec_fn'] = preexec_fn
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145 old_rusage = getrusage(RUSAGE_CHILDREN)
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146 last_rusage = None
118
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diff changeset
147 while True:
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148 try:
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149 os.read(sigchld_pipe_read, 512)
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150 except OSError:
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151 if sys.exc_info()[1].errno == EAGAIN:
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diff changeset
152 break
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153 else:
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154 raise
82
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155 try:
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156 case.process = Popen(*args, **kwargs)
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157 except OSError:
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158 os.close(read)
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159 raise testcases.CannotStartTestee(sys.exc_info()[1])
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160 finally:
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161 os.close(write)
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162 try:
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163 if not catch_escape:
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164 if case.maxwalltime:
118
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diff changeset
165 try:
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166 select((sigchld_pipe_read,), (), (), case.maxwalltime)
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167 except SelectError:
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168 if sys.exc_info()[1].args[0] != EINTR:
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169 raise
82
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170 if case.process.poll() is None:
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171 raise testcases.WallTimeLimitExceeded
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172 else:
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173 case.process.wait()
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174 else:
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175 if not case.maxwalltime:
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176 try:
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177 while case.process.poll() is None:
118
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178 s = select((sys.stdin, sigchld_pipe_read), (), ())
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179 if (sigchld_pipe_read not in s[0] and
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180 sys.stdin.read(1) == '\33'):
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181 raise testcases.CanceledByUser
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182 except (SelectError, IOError):
82
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183 if sys.exc_info()[1].args[0] != EINTR:
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184 raise
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185 else:
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186 case.process.poll()
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187 else:
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188 time_end = clock() + case.maxwalltime
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189 try:
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190 while case.process.poll() is None:
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191 remaining = time_end - clock()
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192 if remaining > 0:
118
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
193 s = select((sys.stdin, sigchld_pipe_read),
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
194 (), (), remaining)
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
195 if (sigchld_pipe_read not in s[0] and
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
196 sys.stdin.read(1) == '\33'):
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diff changeset
197 raise testcases.CanceledByUser
82
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198 else:
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199 raise testcases.WallTimeLimitExceeded
118
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
200 except (SelectError, IOError):
82
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201 if sys.exc_info()[1].args[0] != EINTR:
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diff changeset
202 raise
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diff changeset
203 else:
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diff changeset
204 case.process.poll()
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diff changeset
205 finally:
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diff changeset
206 case.time_started, cpustart = pickle.loads(os.read(read, 512))
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diff changeset
207 os.close(read)
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diff changeset
208 del bury_child.case
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diff changeset
209 new_rusage = getrusage(RUSAGE_CHILDREN)
119
0b265fe9c81f Wall-clock time limit is now enforced on the output wall-clock time
Oleg Oshmyan <chortos@inbox.lv>
parents: 118
diff changeset
210 if (case.maxwalltime and
0b265fe9c81f Wall-clock time limit is now enforced on the output wall-clock time
Oleg Oshmyan <chortos@inbox.lv>
parents: 118
diff changeset
211 case.time_stopped - case.time_started > case.maxwalltime):
0b265fe9c81f Wall-clock time limit is now enforced on the output wall-clock time
Oleg Oshmyan <chortos@inbox.lv>
parents: 118
diff changeset
212 raise testcases.WallTimeLimitExceeded
82
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diff changeset
213 if new_rusage and (case.maxcputime or not case.maxwalltime):
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parents:
diff changeset
214 case.time_started = cpustart
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diff changeset
215 case.time_stopped = new_rusage.ru_utime + new_rusage.ru_stime
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diff changeset
216 case.time_limit_string = case.cpu_time_limit_string
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
217 if case.maxcputime and new_rusage:
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diff changeset
218 oldtime = old_rusage.ru_utime + old_rusage.ru_stime
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diff changeset
219 newtime = new_rusage.ru_utime + new_rusage.ru_stime
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diff changeset
220 if newtime - oldtime - cpustart > case.maxcputime:
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diff changeset
221 raise testcases.CPUTimeLimitExceeded
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parents:
diff changeset
222 if case.maxmemory:
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Oleg Oshmyan <chortos@inbox.lv>
parents:
diff changeset
223 if sys.platform != 'darwin':
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diff changeset
224 maxrss = case.maxmemory * 1024
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diff changeset
225 else:
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diff changeset
226 maxrss = case.maxmemory * 1048576
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diff changeset
227 if last_rusage and last_rusage.ru_maxrss > maxrss:
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diff changeset
228 raise testcases.MemoryLimitExceeded
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parents:
diff changeset
229 elif (new_rusage and
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diff changeset
230 new_rusage.ru_maxrss > old_rusage.ru_maxrss and
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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parents:
diff changeset
231 new_rusage.ru_maxrss > maxrss):
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diff changeset
232 raise testcases.MemoryLimitExceeded
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diff changeset
233
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diff changeset
234 # Emulate memory limits on platforms compatible with 4.3BSD but not XSI
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diff changeset
235 # I say 'emulate' because the OS will allow excessive memory usage
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diff changeset
236 # anyway; Upreckon will just treat the test case as not passed.
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diff changeset
237 # To do this, we not only require os.wait4 to be present but also
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
238 # assume things about the implementation of subprocess.Popen.
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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parents:
diff changeset
239 try:
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diff changeset
240 def waitpid_emu(pid, options, _wait4=os.wait4):
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diff changeset
241 global last_rusage
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diff changeset
242 pid, status, last_rusage = _wait4(pid, options)
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parents:
diff changeset
243 return pid, status
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
244 _waitpid = os.waitpid
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diff changeset
245 os.waitpid = waitpid_emu
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diff changeset
246 try:
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diff changeset
247 defaults = Popen._internal_poll.__func__.__defaults__
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diff changeset
248 except AttributeError:
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diff changeset
249 # Python 2.5
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diff changeset
250 defaults = Popen._internal_poll.im_func.func_defaults
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diff changeset
251 i = defaults.index(_waitpid)
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diff changeset
252 defaults = defaults[:i] + (waitpid_emu,) + defaults[i+1:]
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parents:
diff changeset
253 try:
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diff changeset
254 Popen._internal_poll.__func__.__defaults__ = defaults
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parents:
diff changeset
255 except AttributeError:
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parents:
diff changeset
256 # Python 2.5 again
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diff changeset
257 Popen._internal_poll.im_func.func_defaults = defaults
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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parents:
diff changeset
258 except (AttributeError, ValueError):
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diff changeset
259 pass
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
260
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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parents:
diff changeset
261
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diff changeset
262 def kill(process):
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diff changeset
263 try:
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diff changeset
264 process.kill()
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parents:
diff changeset
265 except AttributeError:
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parents:
diff changeset
266 os.kill(process.pid, SIGKILL)
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diff changeset
267
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
268
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diff changeset
269 def terminate(process):
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diff changeset
270 try:
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diff changeset
271 process.terminate()
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diff changeset
272 except AttributeError:
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diff changeset
273 os.kill(process.pid, SIGTERM)