libio.py 文件源码

def io_transfer(iosock,flag,ifreq):
    """
     send & recieve an ifreq struct
     :param iosock: io socket
     :param flag: sockios control call
     :param ifreq: ifreq to send
     :returns: an the ifreq struct recieved
    """
    try:
        return ioctl(iosock.fileno(),flag,ifreq)
    except (AttributeError,struct.error) as e:
        # either sock is not valid or a bad value passed to ifreq
        if e.message.find('fileno'): raise error(errno.ENOTSOCK,"Bad socket")
        else: raise error(errno.EINVAL,e)
    except IOError as e:
        # generally device cannot be found sort but can also be
        # permissions etc, catch and reraise as our own
        if e.errno is not None: # just in case we have a none 2-tuple error
            raise error(e.errno,e.strerror)
        else:
            raise error(-1,e)
    except Exception as e:
        # blanket catchall
        raise error(-1,e.args[0])