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annotate unix.py @ 85:741ae3391b61

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Moved clock/time detection into platform-specific modules and testcases
author Oleg Oshmyan <chortos@inbox.lv>
date Thu, 24 Feb 2011 23:59:48 +0000
parents 06356af50bf9
children 8cd7a732f2f3
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 import sys
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5
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6 try:
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7 from compat import *
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8 import testcases # mutual import
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9 except ImportError:
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10 import __main__
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11 __main__.import_error(sys.exc_info()[1])
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12
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13 from subprocess import Popen
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14 import os, sys
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15
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16 try:
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17 from testcases import clock
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18 except ImportError:
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19 if sys.platform.startswith('java'):
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20 from time import clock
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21 else:
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22 from time import time as clock
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23
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24 try:
82
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25 from signal import SIGTERM, SIGKILL
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26 except ImportError:
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27 SIGTERM = 15
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28 SIGKILL = 9
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29
85
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30 __all__ = 'call', 'kill', 'terminate', 'pause', 'clock'
82
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31
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32
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33 if not sys.stdin.isatty():
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34 pause = lambda: sys.stdin.read(1)
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35 catch_escape = False
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36 else:
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37 try:
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38 from select import select
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39 import termios, tty, atexit
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40 except ImportError:
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41 pause = None
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42 catch_escape = False
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43 else:
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44 catch_escape = True
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45 def cleanup(old=termios.tcgetattr(sys.stdin.fileno())):
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46 termios.tcsetattr(sys.stdin.fileno(), termios.TCSAFLUSH, old)
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47 atexit.register(cleanup)
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48 tty.setcbreak(sys.stdin.fileno())
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49 def pause():
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50 sys.stdin.read(1)
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51
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52 try:
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53 from signal import SIGCHLD, signal, SIG_DFL
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54 from select import select, error as SelectError
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55 from errno import EINTR
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56 from fcntl import fcntl, F_SETFD, F_GETFD
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57 try:
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58 import cPickle as pickle
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59 except ImportError:
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60 import pickle
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61 except ImportError:
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62 def call(*args, **kwargs):
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63 case = kwargs.pop('case')
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64 try:
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65 case.process = Popen(*args, **kwargs)
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66 except OSError:
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67 raise CannotStartTestee(sys.exc_info()[1])
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68 case.time_started = clock()
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69 if not case.maxtime:
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70 while True:
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71 exitcode, now = case.process.poll(), clock()
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72 if exitcode is not None:
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73 case.time_stopped = now
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74 break
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75 else:
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76 time.sleep(.001)
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77 else:
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78 time_end = case.time_started + case.maxtime
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79 while True:
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80 exitcode, now = case.process.poll(), clock()
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81 if exitcode is not None:
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82 case.time_stopped = now
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83 break
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84 elif now >= time_end:
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85 raise TimeLimitExceeded
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86 else:
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87 time.sleep(.001)
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88 else:
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89 try:
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90 from fcntl import FD_CLOEXEC
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91 except ImportError:
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92 FD_CLOEXEC = 1
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93
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94 try:
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95 from resource import getrusage, RUSAGE_SELF, RUSAGE_CHILDREN
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96 except ImportError:
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97 from time import clock as cpuclock
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98 getrusage = lambda who: None
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99 else:
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100 def cpuclock():
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101 rusage = getrusage(RUSAGE_SELF)
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102 return rusage.ru_utime + rusage.ru_stime
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103
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104 try:
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105 from resource import setrlimit
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106 try:
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107 from resource import RLIMIT_AS
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108 except ImportError:
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109 from resource import RLIMIT_VMEM
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110 except ImportError:
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111 setrlimit = None
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112
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113 # Make SIGCHLD interrupt sleep() and select()
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114 def bury_child(signum, frame):
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115 try:
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116 bury_child.case.time_stopped = clock()
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117 except Exception:
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118 pass
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119 signal(SIGCHLD, bury_child)
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120
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121 # If you want this to work portably, don't set any stdio argument to PIPE
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122 def call(*args, **kwargs):
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123 global last_rusage
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124 bury_child.case = case = kwargs.pop('case')
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125 read, write = os.pipe()
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126 fcntl(write, F_SETFD, fcntl(write, F_GETFD) | FD_CLOEXEC)
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127 def preexec_fn():
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128 os.close(read)
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129 if setrlimit and case.maxmemory:
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130 maxmemory = ceil(case.maxmemory * 1048576)
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131 setrlimit(RLIMIT_AS, (maxmemory, maxmemory))
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132 # I would also set a CPU time limit but I do not want the time
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133 # passing between the calls to fork and exec to be counted in
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134 os.write(write, pickle.dumps((clock(), cpuclock()), 1))
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135 kwargs['preexec_fn'] = preexec_fn
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136 old_rusage = getrusage(RUSAGE_CHILDREN)
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137 last_rusage = None
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138 try:
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139 case.process = Popen(*args, **kwargs)
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140 except OSError:
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141 os.close(read)
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142 raise testcases.CannotStartTestee(sys.exc_info()[1])
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143 finally:
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144 os.close(write)
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145 try:
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146 if not catch_escape:
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147 if case.maxwalltime:
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148 time.sleep(case.maxwalltime)
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149 if case.process.poll() is None:
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150 raise testcases.WallTimeLimitExceeded
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151 else:
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152 case.process.wait()
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153 else:
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154 if not case.maxwalltime:
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155 try:
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156 while case.process.poll() is None:
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157 if select((sys.stdin,), (), ())[0]:
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158 if sys.stdin.read(1) == '\33':
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159 raise testcases.CanceledByUser
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160 except SelectError:
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161 if sys.exc_info()[1].args[0] != EINTR:
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162 raise
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163 else:
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164 case.process.poll()
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165 else:
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166 time_end = clock() + case.maxwalltime
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167 try:
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168 while case.process.poll() is None:
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169 remaining = time_end - clock()
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170 if remaining > 0:
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171 if select((sys.stdin,), (), (), remaining)[0]:
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172 if sys.stdin.read(1) == '\33':
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173 raise testcases.CanceledByUser
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174 else:
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175 raise testcases.WallTimeLimitExceeded
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176 except SelectError:
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177 if sys.exc_info()[1].args[0] != EINTR:
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178 raise
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179 else:
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180 case.process.poll()
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181 finally:
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182 case.time_started, cpustart = pickle.loads(os.read(read, 512))
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183 os.close(read)
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184 del bury_child.case
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185 new_rusage = getrusage(RUSAGE_CHILDREN)
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186 if new_rusage and (case.maxcputime or not case.maxwalltime):
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187 case.time_started = cpustart
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188 case.time_stopped = new_rusage.ru_utime + new_rusage.ru_stime
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189 case.time_limit_string = case.cpu_time_limit_string
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diff changeset
190 if case.maxcputime and new_rusage:
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diff changeset
191 oldtime = old_rusage.ru_utime + old_rusage.ru_stime
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parents:
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192 newtime = new_rusage.ru_utime + new_rusage.ru_stime
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193 if newtime - oldtime - cpustart > case.maxcputime:
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diff changeset
194 raise testcases.CPUTimeLimitExceeded
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diff changeset
195 if case.maxmemory:
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diff changeset
196 if sys.platform != 'darwin':
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diff changeset
197 maxrss = case.maxmemory * 1024
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diff changeset
198 else:
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diff changeset
199 maxrss = case.maxmemory * 1048576
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diff changeset
200 if last_rusage and last_rusage.ru_maxrss > maxrss:
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diff changeset
201 raise testcases.MemoryLimitExceeded
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diff changeset
202 elif (new_rusage and
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parents:
diff changeset
203 new_rusage.ru_maxrss > old_rusage.ru_maxrss and
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parents:
diff changeset
204 new_rusage.ru_maxrss > maxrss):
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parents:
diff changeset
205 raise testcases.MemoryLimitExceeded
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parents:
diff changeset
206
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diff changeset
207 # Emulate memory limits on platforms compatible with 4.3BSD but not XSI
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208 # I say 'emulate' because the OS will allow excessive memory usage
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diff changeset
209 # anyway; Upreckon will just treat the test case as not passed.
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diff changeset
210 # To do this, we not only require os.wait4 to be present but also
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diff changeset
211 # assume things about the implementation of subprocess.Popen.
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parents:
diff changeset
212 try:
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diff changeset
213 def waitpid_emu(pid, options, _wait4=os.wait4):
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parents:
diff changeset
214 global last_rusage
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parents:
diff changeset
215 pid, status, last_rusage = _wait4(pid, options)
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parents:
diff changeset
216 return pid, status
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parents:
diff changeset
217 _waitpid = os.waitpid
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diff changeset
218 os.waitpid = waitpid_emu
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Oleg Oshmyan <chortos@inbox.lv>
parents:
diff changeset
219 try:
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parents:
diff changeset
220 defaults = Popen._internal_poll.__func__.__defaults__
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parents:
diff changeset
221 except AttributeError:
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Oleg Oshmyan <chortos@inbox.lv>
parents:
diff changeset
222 # Python 2.5
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parents:
diff changeset
223 defaults = Popen._internal_poll.im_func.func_defaults
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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parents:
diff changeset
224 i = defaults.index(_waitpid)
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parents:
diff changeset
225 defaults = defaults[:i] + (waitpid_emu,) + defaults[i+1:]
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parents:
diff changeset
226 try:
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diff changeset
227 Popen._internal_poll.__func__.__defaults__ = defaults
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parents:
diff changeset
228 except AttributeError:
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parents:
diff changeset
229 # Python 2.5 again
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parents:
diff changeset
230 Popen._internal_poll.im_func.func_defaults = defaults
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parents:
diff changeset
231 except (AttributeError, ValueError):
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diff changeset
232 pass
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diff changeset
233
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parents:
diff changeset
234
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
235 def kill(process):
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parents:
diff changeset
236 try:
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parents:
diff changeset
237 process.kill()
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parents:
diff changeset
238 except AttributeError:
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Oleg Oshmyan <chortos@inbox.lv>
parents:
diff changeset
239 os.kill(process.pid, SIGKILL)
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parents:
diff changeset
240
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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parents:
diff changeset
241
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parents:
diff changeset
242 def terminate(process):
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parents:
diff changeset
243 try:
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parents:
diff changeset
244 process.terminate()
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parents:
diff changeset
245 except AttributeError:
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parents:
diff changeset
246 os.kill(process.pid, SIGTERM)