/usr/share/pyshared/smartcard/pcsc/PCSCContext.py is in python-pyscard 1.6.12.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | """PCSC context singleton.
__author__ = "http://www.gemalto.com"
Copyright 2001-2012 gemalto
Author: Jean-Daniel Aussel, mailto:jean-daniel.aussel@gemalto.com
This file is part of pyscard.
pyscard is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
pyscard is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with pyscard; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
"""
from threading import RLock
from smartcard.scard import *
from smartcard.pcsc.PCSCExceptions import EstablishContextException
class PCSCContext(object):
"""Manage a singleton pcsc context handle."""
class __PCSCContextSingleton:
"""The actual pcsc context class as a singleton."""
def __init__(self):
hresult, self.hcontext = SCardEstablishContext(SCARD_SCOPE_USER)
if hresult != 0:
raise EstablishContextException(hresult)
def getContext(self):
return self.hcontext
# the singleton
mutex = RLock()
instance = None
def __init__(self):
PCSCContext.mutex.acquire()
try:
if not PCSCContext.instance:
PCSCContext.instance = PCSCContext.__PCSCContextSingleton()
finally:
PCSCContext.mutex.release()
def __getattr__(self, name):
if self.instance:
return getattr(self.instance, name)
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