old_contents: #!/usr/bin/env python
  # Copyright (c) 2011 Google Inc. All rights reserved.
  # Use of this source code is governed by a BSD-style license that can be
  # found in the LICENSE file.
  
  """These functions are executed via gyp-flock-tool when using the Makefile
  generator.  Used on systems that don't have a built-in flock."""
  
  import fcntl
  import os
  import struct
  import subprocess
  import sys
  
  
  def main(args):
    executor = FlockTool()
    executor.Dispatch(args)
  
  
  class FlockTool(object):
    """This class emulates the 'flock' command."""
    def Dispatch(self, args):
      """Dispatches a string command to a method."""
      if len(args) < 1:
        raise Exception("Not enough arguments")
  
      method = "Exec%s" % self._CommandifyName(args[0])
      getattr(self, method)(*args[1:])
  
    def _CommandifyName(self, name_string):
      """Transforms a tool name like copy-info-plist to CopyInfoPlist"""
      return name_string.title().replace('-', '')
  
    def ExecFlock(self, lockfile, *cmd_list):
      """Emulates the most basic behavior of Linux's flock(1)."""
      # Rely on exception handling to report errors.
      # Note that the stock python on SunOS has a bug
      # where fcntl.flock(fd, LOCK_EX) always fails
      # with EBADF, that's why we use this F_SETLK
      # hack instead.
      fd = os.open(lockfile, os.O_WRONLY|os.O_NOCTTY|os.O_CREAT, 0666)
      op = struct.pack('hhllhhl', fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
      fcntl.fcntl(fd, fcntl.F_SETLK, op)
      return subprocess.call(cmd_list)
  
  
  if __name__ == '__main__':
    sys.exit(main(sys.argv[1:]))
  
new_contents: #!/usr/bin/env python
  # Copyright (c) 2011 Google Inc. All rights reserved.
  # Use of this source code is governed by a BSD-style license that can be
  # found in the LICENSE file.
  
  """These functions are executed via gyp-flock-tool when using the Makefile
  generator.  Used on systems that don't have a built-in flock."""
  
  import fcntl
  import os
  import struct
  import subprocess
  import sys
  
  
  def main(args):
    executor = FlockTool()
    executor.Dispatch(args)
  
  
  class FlockTool(object):
    """This class emulates the 'flock' command."""
    def Dispatch(self, args):
      """Dispatches a string command to a method."""
      if len(args) < 1:
        raise Exception("Not enough arguments")
  
      method = "Exec%s" % self._CommandifyName(args[0])
      getattr(self, method)(*args[1:])
  
    def _CommandifyName(self, name_string):
      """Transforms a tool name like copy-info-plist to CopyInfoPlist"""
      return name_string.title().replace('-', '')
  
    def ExecFlock(self, lockfile, *cmd_list):
      """Emulates the most basic behavior of Linux's flock(1)."""
      # Rely on exception handling to report errors.
      # Note that the stock python on SunOS has a bug
      # where fcntl.flock(fd, LOCK_EX) always fails
      # with EBADF, that's why we use this F_SETLK
      # hack instead.
      fd = os.open(lockfile, os.O_WRONLY|os.O_NOCTTY|os.O_CREAT, 0666)
      if sys.platform.startswith('aix'):
        # Python on AIX is compiled with LARGEFILE support, which changes the
        # struct size.
        op = struct.pack('hhIllqq', fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
      else:
        op = struct.pack('hhllhhl', fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
      fcntl.fcntl(fd, fcntl.F_SETLK, op)
      return subprocess.call(cmd_list)
  
  
  if __name__ == '__main__':
    sys.exit(main(sys.argv[1:]))
  
subject: Initialize struct flock for AIX with O_LARGEFILE used by Python.