/usr/lib/python3/dist-packages/pyudev/_ctypeslib/_errorcheckers.py is in python3-pyudev 0.21.0-1.
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 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 | # -*- 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 not None:
return exception(errorstr)
else:
return EnvironmentError(errnum, 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
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