annotate unix.py @ 135:523ba6907f3a

Corrected a typo (hopefully) in problem.strerror
author Oleg Oshmyan <chortos@inbox.lv>
date Tue, 24 May 2011 18:59:00 +0100
parents e84f33a60a5c
children ed4035661b85
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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
134
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25 __all__ = 'call', 'kill', '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 testcases.WallTimeLimitExceeded
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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:
127
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91 from signal import siginterrupt
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92 except ImportError:
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93 # Sucks.
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94 siginterrupt = lambda signalnum, flag: None
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95
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96 try:
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97 from resource import getrusage, RUSAGE_SELF, RUSAGE_CHILDREN
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98 except ImportError:
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99 from time import clock as cpuclock
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100 getrusage = lambda who: None
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101 else:
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102 def cpuclock():
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103 rusage = getrusage(RUSAGE_SELF)
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104 return rusage.ru_utime + rusage.ru_stime
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105
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106 try:
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107 from resource import setrlimit
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108 try:
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109 from resource import RLIMIT_AS
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110 except ImportError:
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111 from resource import RLIMIT_VMEM as RLIMIT_AS
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112 except ImportError:
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113 setrlimit = None
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114
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115 # Make SIGCHLD interrupt sleep() and select()
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116 sigchld_pipe_read, sigchld_pipe_write = os.pipe()
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117 fcntl(sigchld_pipe_read, F_SETFL,
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118 fcntl(sigchld_pipe_read, F_GETFL) | O_NONBLOCK)
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119 fcntl(sigchld_pipe_write, F_SETFL,
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120 fcntl(sigchld_pipe_write, F_GETFL) | O_NONBLOCK)
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121 def bury_child(signum, frame):
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122 try:
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123 bury_child.case.time_stopped = clock()
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124 except Exception:
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125 pass
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126 signal(SIGCHLD, bury_child)
118
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127 set_wakeup_fd(sigchld_pipe_write)
108
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128 class SignalIgnorer(object):
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129 def __enter__(self):
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130 signal(SIGCHLD, SIG_DFL)
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131 def __exit__(self, exc_type, exc_value, traceback):
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132 signal(SIGCHLD, bury_child)
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133 signal_ignorer = SignalIgnorer()
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134 __all__ += 'signal_ignorer',
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135
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136 # If you want this to work portably, don't set any stdio argument to PIPE
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137 def call(*args, **kwargs):
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138 global last_rusage
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139 bury_child.case = case = kwargs.pop('case')
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140 read, write = os.pipe()
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141 fcntl(write, F_SETFD, fcntl(write, F_GETFD) | FD_CLOEXEC)
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142 def preexec_fn():
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143 os.close(read)
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diff changeset
144 if setrlimit and case.maxmemory:
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diff changeset
145 maxmemory = ceil(case.maxmemory * 1048576)
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146 setrlimit(RLIMIT_AS, (maxmemory, maxmemory))
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147 # I would also set a CPU time limit but I do not want the time
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148 # passing between the calls to fork and exec to be counted in
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149 os.write(write, pickle.dumps((clock(), cpuclock()), 1))
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150 kwargs['preexec_fn'] = preexec_fn
127
f5b8a0c0e3cb Multiple bug fixes in the unix module
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diff changeset
151 # So how the hell do I actually make use of pass_fds?
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diff changeset
152 # On 3.1-, calling Popen with pass_fds prints an exception
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diff changeset
153 # from Popen.__del__ to stderr. On 3.2, Popen without close_fds
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diff changeset
154 # or pass_fds creates a child and fails but that of course
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diff changeset
155 # generates a SIGCHLD, which causes problems, and I have
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diff changeset
156 # no process ID to wait upon to negate the changes made
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diff changeset
157 # by the SIGCHLD handler.
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diff changeset
158 kwargs['close_fds'] = False
82
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159 old_rusage = getrusage(RUSAGE_CHILDREN)
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160 last_rusage = None
118
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diff changeset
161 while True:
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
162 try:
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diff changeset
163 os.read(sigchld_pipe_read, 512)
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diff changeset
164 except OSError:
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
165 if sys.exc_info()[1].errno == EAGAIN:
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diff changeset
166 break
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
167 else:
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diff changeset
168 raise
124
19c42a3cd962 Very fast testees no longer break Popen on some UNIX systems on Python 2.6+
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diff changeset
169 siginterrupt(SIGCHLD, False)
82
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170 try:
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171 case.process = Popen(*args, **kwargs)
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172 except OSError:
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173 os.close(read)
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174 raise testcases.CannotStartTestee(sys.exc_info()[1])
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175 finally:
124
19c42a3cd962 Very fast testees no longer break Popen on some UNIX systems on Python 2.6+
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diff changeset
176 siginterrupt(SIGCHLD, True)
82
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177 os.close(write)
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178 try:
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179 if not catch_escape:
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180 if case.maxwalltime:
118
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diff changeset
181 try:
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
182 select((sigchld_pipe_read,), (), (), case.maxwalltime)
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diff changeset
183 except SelectError:
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
184 if sys.exc_info()[1].args[0] != EINTR:
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
185 raise
129
580f0f4687c3 Fixed EINTR fatally breaking another poll() call on Python 2.6-
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diff changeset
186 # subprocess in Python 2.6- is not guarded against EINTR
580f0f4687c3 Fixed EINTR fatally breaking another poll() call on Python 2.6-
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diff changeset
187 try:
580f0f4687c3 Fixed EINTR fatally breaking another poll() call on Python 2.6-
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diff changeset
188 if case.process.poll() is None:
580f0f4687c3 Fixed EINTR fatally breaking another poll() call on Python 2.6-
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diff changeset
189 raise testcases.WallTimeLimitExceeded
580f0f4687c3 Fixed EINTR fatally breaking another poll() call on Python 2.6-
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parents: 128
diff changeset
190 except OSError:
580f0f4687c3 Fixed EINTR fatally breaking another poll() call on Python 2.6-
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diff changeset
191 if sys.exc_info()[1].errno != EINTR:
580f0f4687c3 Fixed EINTR fatally breaking another poll() call on Python 2.6-
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diff changeset
192 raise
580f0f4687c3 Fixed EINTR fatally breaking another poll() call on Python 2.6-
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parents: 128
diff changeset
193 else:
580f0f4687c3 Fixed EINTR fatally breaking another poll() call on Python 2.6-
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diff changeset
194 case.process.poll()
82
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195 else:
128
42c8f5c152a5 Fixed EINTR fatally breaking poll/wait on Python 2.6- (for real this time)
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diff changeset
196 wait(case.process)
82
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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197 else:
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198 if not case.maxwalltime:
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199 try:
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200 while case.process.poll() is None:
118
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
201 s = select((sys.stdin, sigchld_pipe_read), (), ())
127
f5b8a0c0e3cb Multiple bug fixes in the unix module
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diff changeset
202 if (s[0] == [sys.stdin] and
118
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
203 sys.stdin.read(1) == '\33'):
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
204 raise testcases.CanceledByUser
128
42c8f5c152a5 Fixed EINTR fatally breaking poll/wait on Python 2.6- (for real this time)
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diff changeset
205 except (SelectError, IOError, OSError):
82
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
206 if sys.exc_info()[1].args[0] != EINTR:
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
207 raise
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
208 else:
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
209 case.process.poll()
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
210 else:
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
211 time_end = clock() + case.maxwalltime
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
212 try:
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diff changeset
213 while case.process.poll() is None:
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diff changeset
214 remaining = time_end - clock()
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diff changeset
215 if remaining > 0:
118
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
216 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
217 (), (), remaining)
127
f5b8a0c0e3cb Multiple bug fixes in the unix module
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diff changeset
218 if (s[0] == [sys.stdin] and
118
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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diff changeset
219 sys.stdin.read(1) == '\33'):
16fe21d6582e Fixed a few race conditions in unix.call triggered by very fast testees
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parents: 108
diff changeset
220 raise testcases.CanceledByUser
82
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
221 else:
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222 raise testcases.WallTimeLimitExceeded
128
42c8f5c152a5 Fixed EINTR fatally breaking poll/wait on Python 2.6- (for real this time)
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parents: 127
diff changeset
223 except (SelectError, IOError, OSError):
82
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
224 if sys.exc_info()[1].args[0] != EINTR:
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
225 raise
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diff changeset
226 else:
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diff changeset
227 case.process.poll()
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diff changeset
228 finally:
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diff changeset
229 case.time_started, cpustart = pickle.loads(os.read(read, 512))
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diff changeset
230 os.close(read)
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parents:
diff changeset
231 del bury_child.case
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diff changeset
232 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
233 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
234 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
235 raise testcases.WallTimeLimitExceeded
123
90c002c960cb Fixed CPU time display on UNIX
Oleg Oshmyan <chortos@inbox.lv>
parents: 119
diff changeset
236 if new_rusage:
90c002c960cb Fixed CPU time display on UNIX
Oleg Oshmyan <chortos@inbox.lv>
parents: 119
diff changeset
237 time_started = old_rusage.ru_utime + old_rusage.ru_stime + cpustart
90c002c960cb Fixed CPU time display on UNIX
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parents: 119
diff changeset
238 time_stopped = new_rusage.ru_utime + new_rusage.ru_stime
127
f5b8a0c0e3cb Multiple bug fixes in the unix module
Oleg Oshmyan <chortos@inbox.lv>
parents: 126
diff changeset
239 # Yes, this actually happens
f5b8a0c0e3cb Multiple bug fixes in the unix module
Oleg Oshmyan <chortos@inbox.lv>
parents: 126
diff changeset
240 if time_started > time_stopped:
f5b8a0c0e3cb Multiple bug fixes in the unix module
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parents: 126
diff changeset
241 time_started = time_stopped
123
90c002c960cb Fixed CPU time display on UNIX
Oleg Oshmyan <chortos@inbox.lv>
parents: 119
diff changeset
242 if case.maxcputime or not case.maxwalltime:
90c002c960cb Fixed CPU time display on UNIX
Oleg Oshmyan <chortos@inbox.lv>
parents: 119
diff changeset
243 case.time_started = time_started
90c002c960cb Fixed CPU time display on UNIX
Oleg Oshmyan <chortos@inbox.lv>
parents: 119
diff changeset
244 case.time_stopped = time_stopped
90c002c960cb Fixed CPU time display on UNIX
Oleg Oshmyan <chortos@inbox.lv>
parents: 119
diff changeset
245 case.time_limit_string = case.cpu_time_limit_string
90c002c960cb Fixed CPU time display on UNIX
Oleg Oshmyan <chortos@inbox.lv>
parents: 119
diff changeset
246 if (case.maxcputime and
90c002c960cb Fixed CPU time display on UNIX
Oleg Oshmyan <chortos@inbox.lv>
parents: 119
diff changeset
247 time_stopped - time_started > case.maxcputime):
90c002c960cb Fixed CPU time display on UNIX
Oleg Oshmyan <chortos@inbox.lv>
parents: 119
diff changeset
248 raise testcases.CPUTimeLimitExceeded
82
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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parents:
diff changeset
249 if case.maxmemory:
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parents:
diff changeset
250 if sys.platform != 'darwin':
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parents:
diff changeset
251 maxrss = case.maxmemory * 1024
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
252 else:
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
253 maxrss = case.maxmemory * 1048576
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parents:
diff changeset
254 if last_rusage and last_rusage.ru_maxrss > maxrss:
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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parents:
diff changeset
255 raise testcases.MemoryLimitExceeded
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parents:
diff changeset
256 elif (new_rusage and
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parents:
diff changeset
257 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
258 new_rusage.ru_maxrss > maxrss):
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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parents:
diff changeset
259 raise testcases.MemoryLimitExceeded
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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parents:
diff changeset
260
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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diff changeset
261 # Emulate memory limits on platforms compatible with 4.3BSD but not XSI
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diff changeset
262 # I say 'emulate' because the OS will allow excessive memory usage
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diff changeset
263 # anyway; Upreckon will just treat the test case as not passed.
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parents:
diff changeset
264 # 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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parents:
diff changeset
265 # assume things about the implementation of subprocess.Popen.
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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parents:
diff changeset
266 try:
06356af50bf9 Finished testcases reorganization and CPU time limit implementation
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parents:
diff changeset
267 def waitpid_emu(pid, options, _wait4=os.wait4):
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diff changeset
268 global last_rusage
128
42c8f5c152a5 Fixed EINTR fatally breaking poll/wait on Python 2.6- (for real this time)
Oleg Oshmyan <chortos@inbox.lv>
parents: 127
diff changeset
269 pid, status, last_rusage = _wait4(pid, options)
82
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parents:
diff changeset
270 return pid, status
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parents:
diff changeset
271 _waitpid = os.waitpid
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diff changeset
272 os.waitpid = waitpid_emu
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273 try:
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274 defaults = Popen._internal_poll.__func__.__defaults__
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275 except AttributeError:
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276 # Python 2.5
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277 defaults = Popen._internal_poll.im_func.func_defaults
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278 i = defaults.index(_waitpid)
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279 defaults = defaults[:i] + (waitpid_emu,) + defaults[i+1:]
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280 try:
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281 Popen._internal_poll.__func__.__defaults__ = defaults
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282 except AttributeError:
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283 # Python 2.5 again
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284 Popen._internal_poll.im_func.func_defaults = defaults
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285 except (AttributeError, ValueError):
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286 pass
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287
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288
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289 def kill(process):
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290 try:
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291 process.kill()
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292 except AttributeError:
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293 os.kill(process.pid, SIGKILL)
134
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294 wait(process)
128
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295
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296
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297 # subprocess in Python 2.6- is not guarded against EINTR
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298 try:
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299 from errno import EINTR
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300 except ImportError:
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301 wait = Popen.wait
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302 else:
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303 def wait(process):
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304 while True:
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305 try:
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306 return process.wait()
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307 except OSError:
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308 if sys.exc_info()[1].errno != EINTR:
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309 raise