# storing fileno
		self._fileno = fd.fileno()
		# creating interface
		self._io = io.FileIO(self._fileno, 'w', closefd)
		# using empty tail
		self._tail = None
		# putting file to nonblocking mode
		fcntl.fcntl(self._fileno, fcntl.F_SETFL, fcntl.fcntl(self._fileno, fcntl.F_GETFL)  | os.O_NONBLOCK)

	def __del__(self):
		# purge queue before deleting
		if not self.empty():
			self.join()

	def put(self, item, block=True, timeout=None):

class Checker(object):
	__slots__ = frozenset(['_db', '_log', '_queue', '_request', '_stdout'])

	def __init__(self, queue, logger):
		self._db = tagDB()
		self._log = logger
		self._log.info('started')
		self._request = re.compile('^([0-9]+)\ (http|ftp):\/\/([-\w.:]+)\/([^ ]*)\ ([0-9.]+)\/(-|[\w\.]+)\ (-|\w+)\ (-|GET|HEAD|POST).*$')
		self._queue = queue
		self._stdout = FWritelineQueue(sys.stdout, False)

	def process(self, id, site, ip_address, url_path, line = None):
		#self._log.info('trying {}'.format(site))
		result = self._db.check(site, ip_address)
		reply = None