def safe_check_subprocess(code):
  """
  <Purpose>
    Runs safe_check() in a subprocess. This is done because the AST safe_check()
    creates uses a large amount of RAM. By running safe_check() in a subprocess
    we can guarantee that the memory will be reclaimed when the process ends.
  
  <Arguments>
    code: See safe_check.
    
  <Exceptions>
    As with safe_check.
  
  <Return>
    See safe_check.
  """
  
  # Get the path to safe_check.py by using the original start directory of python
  path_to_safe_check = os.path.join(repy_constants.REPY_START_DIR, "safe_check.py")
  
  # Start a safety check process, reading from the user code and outputing to a pipe we can read
  proc = subprocess.Popen([sys.executable, path_to_safe_check],stdin=subprocess.PIPE, stdout=subprocess.PIPE)
  
  # Write out the user code, close so the other end gets an EOF
  proc.stdin.write(code)
  proc.stdin.close()
  
  # Wait for the process to terminate
  starttime = nonportable.getruntime()

  # Only wait up to EVALUTATION_TIMEOUT seconds before terminating
  while nonportable.getruntime() - starttime < EVALUTATION_TIMEOUT:
    # Did the process finish running?
    if proc.poll() != None:
      break;
    time.sleep(0.02)
  else:
    # Kill the timed-out process
    try:
      harshexit.portablekill(proc.pid)
    except:
      pass
    raise Exception, "Evaluation of code safety exceeded timeout threshold \
                    ("+str(nonportable.getruntime() - starttime)+" seconds)"
  
  # Read the output and close the pipe
  output = proc.stdout.read()
  proc.stdout.close()
  
  # Check the output, None is success, else it is a failure
  if output == "None":
    return True
  
  # If there is no output, this is a fatal error condition
  elif output == "":
    raise Exception, "Fatal error while evaluating code safety!"
    
  else:
    # Raise the error from the output
    raise exception_hierarchy.SafeException, output

def should_start_waitable_thread(threadid, threadname):
  # first time!   Let's init!
  if threadid not in thread_starttime:
    thread_waittime[threadid] = minwaittime
    thread_starttime[threadid] = 0.0

  # If asking about advert thread and node_reset_config specifies to reset it,
  # then return True
  if threadid == 'advert' and node_reset_config['reset_advert']:
    # Before returning, turn off the reset flag
    node_reset_config['reset_advert'] = False
    return True
  
  # If it has been started, and the elapsed time is too short, always return
  # False to say it shouldn't be restarted
  if thread_starttime[threadid] and nonportable.getruntime() - thread_starttime[threadid] < thread_waittime[threadid]:
    return False
    
  for thread in threading.enumerate():
    if threadname in str(thread):
      # running now.   If it's run for a reasonable time, let's reduce the 
      # wait time...
      if nonportable.getruntime() - thread_starttime[threadid] > reasonableruntime:
        thread_waittime[threadid] = max(minwaittime, thread_waittime[threadid]-decreaseamount)
      return False
  else:
    return True

def lookup_timedout():
    """
    <Purpose>
       Waits for lookup_done_event and notifies the folks on the
       notify_list (global var) of the lookup timeout.

    <Arguments>
        None.

    <Exceptions>
        None.

    <Side Effects>
        Sends an email to the notify_list folks

    <Returns>
        None.
    """
    integrationtestlib.log("in lookup_timedout()")
    notify_msg = "Centralized lookup failed -- lookup_timedout() fired after 30 sec."
    
    # wait for the event to be set, timeout after 30 minutes
    wait_time = 1800
    tstamp_before_wait = nonportable.getruntime()
    lookup_done_event.wait(wait_time)
    tstamp_after_wait = nonportable.getruntime()

    t_waited = tstamp_after_wait - tstamp_before_wait
    if abs(wait_time - t_waited) < 5:
        notify_msg += " And lookup stalled for over 30 minutes (max timeout value)."
    else:
        notify_msg += " And lookup stalled for " + str(t_waited) + " seconds"

    integrationtestlib.notify(notify_msg)
    return

def safe_check(code):
    """Check the code to be safe."""
    return True
    # NOTE: This code will not work in Windows Mobile due to the reliance on subprocess
    
    # Get the path to safe_check.py by using the original start directory of python
    path_to_safe_check = os.path.join(repy_constants.REPY_START_DIR, "safe_check.py")
    
    # Start a safety check process, reading from the user code and outputing to a pipe we can read
    proc = subprocess.Popen(["python", path_to_safe_check],stdin=subprocess.PIPE, stdout=subprocess.PIPE)
    
    # Write out the user code, close so the other end gets an EOF
    proc.stdin.write(code)
    proc.stdin.close()
    
    # Wait for the process to terminate
    starttime = nonportable.getruntime()
    status = None
    
    # Only wait up to EVALUTATION_TIMEOUT seconds before terminating
    while status == None and (nonportable.getruntime() - starttime < EVALUTATION_TIMEOUT):
      status = proc.poll()
      time.sleep(0.02)
      
    else:
      # Check if the process is still running
      if status == None:
        # Try to terminate the external process
        try:
          harshexit.portablekill(proc.pid)
        except:
          pass
      
        # Raise an exception
        raise Exception, "Evaluation of code safety exceeded timeout threshold ("+str(nonportable.getruntime() - starttime)+" seconds)"
    
    
    # Read the output and close the pipe
    output = proc.stdout.read()
    proc.stdout.close()
    
    # Check the output, None is success, else it is a failure
    if output == "None":
      return True
    
    # If there is no output, this is a fatal error condition
    elif output == "":
      raise Exception, "Fatal error while evaluating code safety!"
      
    else:
      # Raise the error from the output
      raise exception_hierarchy.SafeException, output

def measure_write(write_file_obj, blocksize, totalbytes, use_sync=False):
  """
  <Purpose>
    Attempts to measure the disk write rate by writing totalbytes bytes to a
    temporary file (performing a flush each time blocksize many bytes have been
    written), timing how long it took, and dividing num_bytes by the time
    to get the write rate.

  <Arguments>
    write_file - The file to be written to.  This should be an already opened
                 file handle that was opened with write access.

    blocksize - The amount of data in bytes to write before a flush is performed.
    
    totalbytes - The total number of bytes that should be written for the test.

    use_sync - Set to True if sync should be used to make sure the data is
               actually written to disk.  Should not be set to True on
               Windows because sync does not exist there.  Defaults to False.

  <Side Effects>
    Creates a file of size totalbytes.

  <Exceptions>
    Exceptions could be thrown if there is a problem opening/writing the file.
    
    ZeroDivisionError if the drive is to fast for the accuracy of the clock (for
    a fast drive in combination with a time that provided poor granularity.

  <Return>
    A tuple (rate, fn) where rate is the measured write rate, and fn is the 
    name of the file created.  It is up to the caller to ensure that this 
    file is deleted.  We do not delete it here because it will likely be 
    useful in doing the read rate measurments.
  """
  
  start_time = nonportable.getruntime()
 
  for trial in range(0, totalbytes, blocksize):
    write_file_obj.write(' ' * blocksize)
    #write_file_obj.flush()
    #if use_sync:
    #  # Only use sync if it is requested. See comment at import for explanation.
    #  libc.sync()

  write_file_obj.flush()
  end_time = nonportable.getruntime()

  return (totalbytes)/(end_time - start_time)

def do_sleep(seconds):
  # Using getruntime() in lieu of time.time() because we want elapsed time 
  # regardless of the oddities of NTP
  start = nonportable.getruntime()
  sleeptime = seconds

  # return no earlier than the finish time
  finish = start + seconds

  while sleeptime > 0.0:
    time.sleep(sleeptime)
    now = nonportable.getruntime()

    # If sleeptime > 0.0 then I woke up early...
    sleeptime = finish - now

def _update_resource_consumption_table(resource, resource_allowed_dict, consumed_resource_dict):

  thetime = nonportable.getruntime()

  # I'm going to reduce all renewable resources by the appropriate amount given
  # the amount of elapsed time.

  elapsedtime = thetime - consumed_resource_dict['renewable_update_time'][resource]

  consumed_resource_dict['renewable_update_time'][resource] = thetime

  if elapsedtime < 0:
    # A negative number (likely a NTP reset).   Let's just ignore it.
    return

  # Remove the charge
  reduction = elapsedtime * resource_allowed_dict[resource]
    
  if reduction > consumed_resource_dict[resource]:

    # It would reduce it below zero (so put it at zero)
    consumed_resource_dict[resource] = 0.0
  else:

    # Subtract some for elapsed time...
    consumed_resource_dict[resource] = consumed_resource_dict[resource] - reduction

def should_start_waitable_thread(threadid, threadname):
  # first time!   Let's init!
  if threadid not in thread_starttime:
    thread_waittime[threadid] = minwaittime
    thread_starttime[threadid] = 0.0

  # If it has been started, and the elapsed time is too short, always return
  # False to say it shouldn't be restarted
  if thread_starttime[threadid] and nonportable.getruntime() - thread_starttime[threadid] < thread_waittime[threadid]:
    return False
    
  for thread in threading.enumerate():
    if threadname in str(thread):
      # running now.   If it's run for a reasonable time, let's reduce the 
      # wait time...
      if nonportable.getruntime() - thread_starttime[threadid] > reasonableruntime:
        thread_waittime[threadid] = max(minwaittime, thread_waittime[threadid]-decreaseamount)
      return False
  else:
    return True

def measure_read(read_file_obj, blocksize):
  """
  <Purpose>
    Attempts to measure the disk read rate by reading blocksize bytes from a
    temp file, timing how long it took, and dividing blocksize by the time
    to get the read rate.  Note that at this time, read rate is far too fast
    because it reads what was just written.  It should be ok to just take the
    value given by the write test and use it for both read and write rate.

  <Arguments>
    read_file_obj - The file object that is to be read from for the read test.
                    This file object is not closed by this function.
    blocksize - The number of bytes that should be read to determine the
                read rate.

  <Side Effects>
    None

  <Exceptions>
    Exceptions could be thrown if there is a problem opening/reading the file.

    ZeroDivisionError if the drive is to fast for the accuracy of the clock (for
    a fast drive in combination with a time that provided poor granularity.
    
  <Return>
    A tuple (rate, blocksize) where rate is the measured read rate, and 
    blocksize is the number of bytes actually read.  It will be no more than
    what was actually asked for, but it could be less if the given file was 
    too short.  The read rate will have been calculated using the returned
    blocksize.
  """

  # Time how long it takes to read in blocksize.
  start_time = nonportable.getruntime()
  junk_data = read_file_obj.read(blocksize)
  end_time = nonportable.getruntime()

  blocksize = len(junk_data)

  return (blocksize/(end_time - start_time), blocksize)

def stopvessel(vesselname,exitparams=(44, '')):
  if vesselname not in vesseldict:
    raise BadRequest, "No such vessel"

  # this is broken out to prevent a race between checking the status and 
  # reporting the error
  currentstatus = vesseldict[vesselname]['status'] 
  # It must be started for us to stop it...
  if currentstatus != 'Started':
    raise BadRequest("Cannot stop vessel with status '"+currentstatus+"'")
  
  # Armon: Create the stop file, using a .tmp extension
  fileo = open(vesseldict[vesselname]['stopfilename']+".tmp","w")
  
  # Write out the stop string, Format: EINT;EMESG
  fileo.write(str(exitparams[0]) + ";" + exitparams[1])
  
  # Close the object
  fileo.close()
  
  # Rename the tmp file to the actual stopfile, this should be detected by repy now
  os.rename(vesseldict[vesselname]['stopfilename']+".tmp", vesseldict[vesselname]['stopfilename'])

  starttime = nonportable.getruntime()

  # wait for up to 10 seconds for it to stop (else return an error)
  while nonportable.getruntime()-starttime < 10:
    if vesseldict[vesselname]['status'] != 'Started':
      break

    # sleep while busy waiting...
    time.sleep(.5)

  else:
    return "May not have stopped in a timely manner\nWarning"
  
  return vesseldict[vesselname]['status']+"\nSuccess"

def sleep(seconds):
  """
   <Purpose>
      Allow the current event to pause execution (similar to time.sleep()).
      This function will not return early for any reason

   <Arguments>
      seconds:
         The number of seconds to sleep.   This can be a floating point value

   <Exceptions>
      RepyArgumentException if seconds is not an int/long/float.

   <Side Effects>
      None.

   <Returns>
      None.
  """

  # Check seconds to ensure it is a valid type.
  if type(seconds) not in [long, float, int]:
    raise RepyArgumentError("Invalid type " + str(type(seconds)))

  # Using getruntime() in lieu of time.time() because we want elapsed time 
  # regardless of the oddities of NTP
  start = nonportable.getruntime()
  sleeptime = seconds

  # Return no earlier than the finish time
  finish = start + seconds

  while sleeptime > 0.0:
    time.sleep(sleeptime)

    # If sleeptime > 0.0 then I woke up early...
    sleeptime = finish - nonportable.getruntime()

def calculate_sleeptimes():
  ''' 
  <Purpose>
      calculate amount of sleep time for each process
  ''' 
  global pid_list
  global process_cpu_info

  ## calculate ecalapsed time of the last "period"
  global last_runtime
  global cpu_limit

  this_runtime = nonportable.getruntime()
  # print "Debug - this_runtime: ", this_runtime
  # if this_runtime == 0.0:
  #   print "Debug - this_runtime == 0.0 "
  #   return

  elapsedtime = this_runtime - last_runtime
  # print "Debug - last_runtime: ", last_runtime
  # print "Debug - this_runtime: ", this_runtime
  # print "\n"
  # print "Debug1 - elapsedtime: ", elapsedtime

  if elapsedtime < 0.0:
    print "Error: elapsed time < 0" 

  last_runtime = this_runtime


  for pid in pid_list:
    last_user_time = process_cpu_info[pid][0]
    if ostype == 'Windows':
      this_user_time = windows_api.get_process_cpu_time(pid)
    elif ostype == 'Linux':
      this_user_time = linux_api.get_process_cpu_time(pid)
    else:
      raise UnsupportedSystemException, "Unsupported system type: '"+osrealtype+"' (alias: "+ostype+")"
    # percent used is the amount of change divided by the time...
    percentused = (this_user_time - last_user_time) / elapsedtime 
    # print "Debug1 - pid:",pid, "percentused: ",percentused
    # Calculate amount of time to sleep for
    # print "Debug - cpu_limit: ",cpu_limit[pid]
    sleeptime = nanny.calculate_cpu_sleep_interval(cpu_limit[pid], percentused,elapsedtime)
    # print "Debug1 - pid:",pid,"sleeptime: ",sleeptime
    process_cpu_info[pid][1] = sleeptime
    process_cpu_info[pid][0] = this_user_time

def getruntime():
  """
   <Purpose>
      Return the amount of time the program has been running.   This is in
      wall clock time. This is guaranteed to be monotonic.

   <Arguments>
      None

   <Exceptions>
      None.

   <Side Effects>
      None

   <Returns>
      The elapsed time as float
  """
  return nonportable.getruntime()

def getruntime():
  """
   <Purpose>
      Return the amount of time the program has been running.   This is in
      wall clock time.   This function is not guaranteed to always return
      increasing values due to NTP, etc.

   <Arguments>
      None

   <Exceptions>
      None.

   <Side Effects>
      None

   <Remarks>
      Accurate granularity not guaranteed past 1 second.

   <Returns>
      The elapsed time as float
  """
  restrictions.assertisallowed('getruntime')
  return nonportable.getruntime()

  start_advert_thread(vesseldict, myname, configuration['publickey'])

  # Start status thread...
  start_status_thread(vesseldict,configuration['pollfrequency'])


  # we should be all set up now.   

  servicelogger.log("[INFO]:Started")

  # I will count my iterations through the loop so that I can log a message
  # periodically.   This makes it clear I am alive.
  times_through_the_loop = 0

  # Setup the initial time for checking Affix status.
  last_check_affix_time = nonportable.getruntime()


  # BUG: Need to exit all when we're being upgraded
  while True:

    # E.K Previous there was a check to ensure that the accepter
    # thread was started.  There is no way to actually check this
    # and this code was never executed, so i removed it completely

    myname = node_reset_config['name']
        
    if not is_worker_thread_started():
      servicelogger.log("[WARN]:At " + str(time.time()) + " restarting worker...")
      start_worker_thread(configuration['pollfrequency'])

def startvessel_ex(vesselname, prog_platform, argstring):
  
  # Convert the programming platform to lowercase to make
  # it case insensitive.
  prog_platform = prog_platform.lower()

  if vesselname not in vesseldict:
    raise BadRequest, "No such vessel"

  if vesseldict[vesselname]['status'] == 'Started':
    raise BadRequest("Vessel has already been started")

  if prog_platform not in prog_platform_dir.keys():
    raise BadRequest("Programming language platform is not supported.")

  # remove any prior stop file so that we can start
  if os.path.exists(vesseldict[vesselname]['stopfilename']):
    os.remove(vesseldict[vesselname]['stopfilename'])

  for char in argstring:
    if char not in allowedchars:
      raise BadRequest("Character '"+char+"' not allowed in arguments")
 
  # I'm going to capture the status and timestamp and then check the see if
  # the timestamp is updated...
  oldstatus, oldtimestamp = statusstorage.read_status(vesseldict[vesselname]['statusfilename'])

  # Armon: this is required to fetch the networkrestrictions information from the configuration
  configuration = persist.restore_object("nodeman.cfg")

  
  # Armon: Generate the IP/Iface preferences if they exist
  ip_iface_preference_flags = []
  ip_iface_preference_str = ""    # Needed for Win Mobile

  # Only add the flags if everything necessary exists
  if 'networkrestrictions' in configuration and 'repy_restricted' in configuration['networkrestrictions'] \
    and configuration['networkrestrictions']['repy_restricted'] and 'repy_user_preference' in configuration['networkrestrictions']:
      # Generate the preference list
      for (is_ip, value) in configuration['networkrestrictions']['repy_user_preference']:
        # Append the correct flag
        if is_ip:
          ip_iface_preference_flags.append("--ip")
          ip_iface_preference_str += "--ip "
        else:
          ip_iface_preference_flags.append("--iface")
          ip_iface_preference_str += "--iface "
          
        # Append the value
        ip_iface_preference_flags.append(value)
        ip_iface_preference_str += "'" + value + "' "
        
      # Check for the --nootherips flag
      if 'repy_nootherips' in configuration['networkrestrictions'] and configuration['networkrestrictions']['repy_nootherips']:
        # Append the flag
        ip_iface_preference_flags.append("--nootherips")
        ip_iface_preference_str += "--nootherips "
    
  # Find the location where the sandbox files is located. Location of repyV1, repyV2 etc.
  prog_platform_location = os.path.join(prog_platform_dir[prog_platform], "repy.py")
 
  # I use absolute paths so that repy can still find the files after it 
  # changes directories...
  
  # Conrad: switched this to sequence-style Popen invocation so that spaces
  # in files work. Switched it back to absolute paths.
  command = [sys.executable, prog_platform_location] + ip_iface_preference_flags + [
      "--logfile", os.path.abspath(vesseldict[vesselname]['logfilename']),
      "--stop",    os.path.abspath(vesseldict[vesselname]['stopfilename']),
      "--status",  os.path.abspath(vesseldict[vesselname]['statusfilename']),
      "--cwd",     os.path.abspath(vesselname),
      "--servicelog", 
      "--execinfo",
      os.path.abspath(vesseldict[vesselname]['resourcefilename'])] + argstring.split()

  portable_popen.Popen(command)


  starttime = nonportable.getruntime()

  # wait for 10 seconds for it to start (else return an error)
  while nonportable.getruntime()-starttime < 10:
    newstatus, newtimestamp = statusstorage.read_status(vesseldict[vesselname]['statusfilename'])
    # Great!   The timestamp was updated...   The new status is the result of 
    # our work.   Let's tell the user what happened...
    if newtimestamp != oldtimestamp and newstatus != None:
      break

    

    # sleep while busy waiting...
    time.sleep(.5)

  else:
    return "Did not start in a timely manner\nWarning"

  # We need to update the status in the table because the status thread might
  # not notice this before our next request... (else occasional failures on XP)
  nmstatusmonitor.update_status(vesseldict, vesselname, newstatus, newtimestamp)

#.........这里部分代码省略.........

def safe_check_subprocess(code):
  """
  <Purpose>
    Runs safe_check() in a subprocess. This is done because the AST safe_check()
    creates uses a large amount of RAM. By running safe_check() in a subprocess
    we can guarantee that the memory will be reclaimed when the process ends.
  
  <Arguments>
    code: See safe_check.
    
  <Exceptions>
    As with safe_check.
  
  <Return>
    See safe_check.
  """
  
  # Get the path to safe_check.py by using the original start directory of python
  path_to_safe_check = os.path.join(repy_constants.REPY_START_DIR, "safe_check.py")
  
  # Start a safety check process, reading from the user code and outputing to a pipe we can read
  proc = subprocess.Popen([sys.executable, path_to_safe_check],stdin=subprocess.PIPE, stdout=subprocess.PIPE)
  
  # Write out the user code, close so the other end gets an EOF
  proc.stdin.write(code)
  proc.stdin.close()
  
  # Wait for the process to terminate
  starttime = nonportable.getruntime()

  # Only wait up to EVALUTATION_TIMEOUT seconds before terminating
  while nonportable.getruntime() - starttime < EVALUTATION_TIMEOUT:
    # Did the process finish running?
    if proc.poll() != None:
      break;
    time.sleep(0.02)
  else:
    # Kill the timed-out process
    try:
      harshexit.portablekill(proc.pid)
    except:
      pass
    raise Exception, "Evaluation of code safety exceeded timeout threshold \
                    ("+str(nonportable.getruntime() - starttime)+" seconds)"
  
  # Read the output and close the pipe
  rawoutput = proc.stdout.read()
  proc.stdout.close()


  # Interim fix for #1080: Get rid of stray debugging output on Android
  # of the form "dlopen libpython2.6.so" and "dlopen /system/lib/libc.so",
  # yet preserve all of the other output (including empty lines).

  if IS_ANDROID:
    output = ""
    for line in rawoutput.split("\n"):
      # Preserve empty lines
      if line == "":
        output += "\n"
        continue
      # Suppress debug messages we know can turn up
      wordlist = line.split()
      if wordlist[0]=="dlopen":
        if wordlist[-1]=="/system/lib/libc.so":
          continue
        if wordlist[-1].startswith("libpython") and \
          wordlist[-1].endswith(".so"):
          # We expect "libpython" + version number + ".so".
          # The version number should be a string convertible to float.
          # If it's not, raise an exception.
          try:
            versionstring = (wordlist[-1].replace("libpython", 
              "")).replace(".so", "")
            junk = float(versionstring)
          except TypeError, ValueError:
            raise Exception("Unexpected debug output '" + line + 
              "' while evaluating code safety!")
      else:
        output += line + "\n"

    # Strip off the last newline character we added
    output = output[0:-1]

def started_waitable_thread(threadid):
  thread_starttime[threadid] = nonportable.getruntime()
  thread_waittime[threadid] = min(maxwaittime, thread_waittime[threadid] ** wait_exponent)

def safe_check(code):
    """Check the code to be safe."""
    # NOTE: This code will not work in Windows Mobile due to the reliance on subprocess
    
    # Get the path to safe_check.py by using the original start directory of python
    path_to_safe_check = os.path.join(repy_constants.REPY_START_DIR, "safe_check.py")
    
    # Start a safety check process, reading from the user code and outputing to a pipe we can read
    proc = subprocess.Popen([sys.executable, path_to_safe_check],stdin=subprocess.PIPE, stdout=subprocess.PIPE)
    
    # Write out the user code, close so the other end gets an EOF
    proc.stdin.write(code)
    proc.stdin.close()
    
    # Wait for the process to terminate
    starttime = nonportable.getruntime()
    status = None
    
    # Only wait up to EVALUTATION_TIMEOUT seconds before terminating
    while status == None and (nonportable.getruntime() - starttime < EVALUTATION_TIMEOUT):
      status = proc.poll()
      time.sleep(0.02)
      
    else:
      # Check if the process is still running
      if status == None:
        # Try to terminate the external process
        try:
          harshexit.portablekill(proc.pid)
        except:
          pass
      
        # Raise an exception
        raise Exception, "Evaluation of code safety exceeded timeout threshold ("+str(nonportable.getruntime() - starttime)+" seconds)"
    
    
    # Read the output and close the pipe
    rawoutput = proc.stdout.read()
    proc.stdout.close()

    # Interim fix for #1080: Get rid of stray debugging output on Android
    # of the form "dlopen libpython2.6.so" and "dlopen /system/lib/libc.so",
    # yet preserve all of the other output (including empty lines).

    output = ""
    for line in rawoutput.split("\n"):
      # Preserve empty lines
      if line == "":
        output += "\n"
        continue
      # Suppress debug messages we know can turn up
      wordlist = line.split()
      if wordlist[0]=="dlopen":
        if wordlist[-1]=="/system/lib/libc.so":
          continue
        if wordlist[-1].startswith("libpython") and \
          wordlist[-1].endswith(".so"):
          # We expect "libpython" + version number + ".so".
          # The version number should be a string convertible to float.
          # If it's not, raise an exception.
          try:
            versionstring = (wordlist[-1].replace("libpython", 
              "")).replace(".so", "")
            junk = float(versionstring)
          except TypeError, ValueError:
            raise Exception("Unexpected debug output '" + line + 
              "' while evaluating code safety!")
      else:
        output += line + "\n"