import os import errno import ctypes libc = ctypes.CDLL(None, use_errno=True) def errcheck(result, func, args): if result < 0: e = ctypes.get_errno() raise OSError(e, errno.strerror(e)) return result def lookup(restype, name, argtypes): f = libc[name] f.restye = restype f.argtypes = argtypes f.errcheck = errcheck return f class SelfClosing(object): def __enter__(self): return self def __exit__(self, *exc): self.close() return False