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Edit: _errorcheckers.py
# -*- coding: utf-8 -*- # Copyright (C) 2013 Sebastian Wiesner <lunaryorn@gmail.com> # This library 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. # This library 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 this library; if not, write to the Free Software Foundation, # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA """ pyudev._ctypeslib._errorcheckers ================================ Error checkers for ctypes wrappers. """ from __future__ import absolute_import from __future__ import division from __future__ import print_function from __future__ import unicode_literals import os import errno from ctypes import get_errno ERRNO_EXCEPTIONS = { errno.ENOMEM: MemoryError, errno.EOVERFLOW: OverflowError, errno.EINVAL: ValueError } def exception_from_errno(errnum): """Create an exception from ``errnum``. ``errnum`` is an integral error number. Return an exception object appropriate to ``errnum``. """ exception = ERRNO_EXCEPTIONS.get(errnum) errorstr = os.strerror(errnum) if exception is None: return EnvironmentError(errnum, errorstr) return exception(errorstr) def check_negative_errorcode(result, _func, *_args): """Error checker for funtions, which return negative error codes. If ``result`` is smaller than ``0``, it is interpreted as negative error code, and an appropriate exception is raised: - ``-ENOMEM`` raises a :exc:`~exceptions.MemoryError` - ``-EOVERFLOW`` raises a :exc:`~exceptions.OverflowError` - all other error codes raise :exc:`~exceptions.EnvironmentError` If result is greater or equal to ``0``, it is returned unchanged. """ if result < 0: # udev returns the *negative* errno code at this point errnum = -result raise exception_from_errno(errnum) else: return result def check_errno_on_nonzero_return(result, _func, *_args): """Error checker to check the system ``errno`` as returned by :func:`ctypes.get_errno()`. If ``result`` is not ``0``, an exception according to this errno is raised. Otherwise nothing happens. """ if result != 0: errnum = get_errno() if errnum != 0: raise exception_from_errno(errnum) return result def check_errno_on_null_pointer_return(result, _func, *_args): """Error checker to check the system ``errno`` as returned by :func:`ctypes.get_errno()`. If ``result`` is a null pointer, an exception according to this errno is raised. Otherwise nothing happens. """ # pylint: disable=invalid-name if not result: errnum = get_errno() if errnum != 0: raise exception_from_errno(errnum) return result