v8/tools/testrunner/local/commands.py

# Copyright 2012 the V8 project authors. All rights reserved.
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# modification, are permitted provided that the following conditions are
# met:
#
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#       notice, this list of conditions and the following disclaimer.
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#       copyright notice, this list of conditions and the following
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#       with the distribution.
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#       contributors may be used to endorse or promote products derived
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#
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import os
import subprocess
from threading import Timer

from ..local import utils
from ..objects import output


SEM_INVALID_VALUE = -1
SEM_NOGPFAULTERRORBOX = 0x0002  # Microsoft Platform SDK WinBase.h


def Win32SetErrorMode(mode):
  prev_error_mode = SEM_INVALID_VALUE
  try:
    import ctypes
    prev_error_mode = \
        ctypes.windll.kernel32.SetErrorMode(mode)  #@UndefinedVariable
  except ImportError:
    pass
  return prev_error_mode


def RunProcess(verbose, timeout, args, **rest):
  if verbose: print "#", " ".join(args)
  popen_args = args
  prev_error_mode = SEM_INVALID_VALUE
  if utils.IsWindows():
    popen_args = subprocess.list2cmdline(args)
    # Try to change the error mode to avoid dialogs on fatal errors. Don't
    # touch any existing error mode flags by merging the existing error mode.
    # See http://blogs.msdn.com/oldnewthing/archive/2004/07/27/198410.aspx.
    error_mode = SEM_NOGPFAULTERRORBOX
    prev_error_mode = Win32SetErrorMode(error_mode)
    Win32SetErrorMode(error_mode | prev_error_mode)
  process = subprocess.Popen(
    args=popen_args,
    stdout=subprocess.PIPE,
    stderr=subprocess.PIPE,
    **rest
  )
  if (utils.IsWindows() and prev_error_mode != SEM_INVALID_VALUE):
    Win32SetErrorMode(prev_error_mode)

  def kill_process(process, timeout_result):
    timeout_result[0] = True
    try:
      process.kill()
    except OSError:
      sys.stderr.write('Error: Process %s already ended.\n' % process.pid)

  # Pseudo object to communicate with timer thread.
  timeout_result = [False]

  timer = Timer(timeout, kill_process, [process, timeout_result])
  timer.start()
  stdout, stderr = process.communicate()
  timer.cancel()
  return process.returncode, timeout_result[0], stdout, stderr


def Execute(args, verbose=False, timeout=None):
  args = [ c for c in args if c != "" ]
  exit_code, timed_out, stdout, stderr = RunProcess(
    verbose,
    timeout,
    args=args,
  )
  return output.Output(exit_code, timed_out, stdout, stderr)