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69 lines
2.4 KiB
Python
69 lines
2.4 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2013 Sebastian Wiesner <lunaryorn@gmail.com>
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# This library is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by the
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# Free Software Foundation; either version 2.1 of the License, or (at your
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# option) any later version.
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# This library is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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# for more details.
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# You should have received a copy of the GNU Lesser General Public License
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# along with this library; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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"""
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pyudev._ctypeslib.utils
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=======================
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Utilities for loading ctypeslib.
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.. moduleauthor:: Anne Mulhern <amulhern@redhat.com>
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"""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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from __future__ import unicode_literals
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from ctypes import CDLL
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from ctypes.util import find_library
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def load_ctypes_library(name, signatures, error_checkers):
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"""
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Load library ``name`` and return a :class:`ctypes.CDLL` object for it.
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:param str name: the library name
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:param signatures: signatures of methods
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:type signatures: dict of str * (tuple of (list of type) * type)
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:param error_checkers: error checkers for methods
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:type error_checkers: dict of str * ((int * ptr * arglist) -> int)
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The library has errno handling enabled.
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Important functions are given proper signatures and return types to support
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type checking and argument conversion.
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:returns: a loaded library
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:rtype: ctypes.CDLL
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:raises ImportError: if the library is not found
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"""
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library_name = find_library(name)
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if not library_name:
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raise ImportError('No library named %s' % name)
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lib = CDLL(library_name, use_errno=True)
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# Add function signatures
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for funcname, signature in signatures.items():
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function = getattr(lib, funcname, None)
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if function:
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argtypes, restype = signature
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function.argtypes = argtypes
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function.restype = restype
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errorchecker = error_checkers.get(funcname)
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if errorchecker:
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function.errcheck = errorchecker
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return lib
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