forked from python/cpython
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathtest_callbacks.py
More file actions
293 lines (234 loc) · 9.31 KB
/
test_callbacks.py
File metadata and controls
293 lines (234 loc) · 9.31 KB
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
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
import functools
import unittest
from ctypes import *
from ctypes.test import need_symbol
import _ctypes_test
class Callbacks(unittest.TestCase):
functype = CFUNCTYPE
## def tearDown(self):
## import gc
## gc.collect()
def callback(self, *args):
self.got_args = args
return args[-1]
def check_type(self, typ, arg):
PROTO = self.functype.__func__(typ, typ)
result = PROTO(self.callback)(arg)
if typ == c_float:
self.assertAlmostEqual(result, arg, places=5)
else:
self.assertEqual(self.got_args, (arg,))
self.assertEqual(result, arg)
PROTO = self.functype.__func__(typ, c_byte, typ)
result = PROTO(self.callback)(-3, arg)
if typ == c_float:
self.assertAlmostEqual(result, arg, places=5)
else:
self.assertEqual(self.got_args, (-3, arg))
self.assertEqual(result, arg)
################
def test_byte(self):
self.check_type(c_byte, 42)
self.check_type(c_byte, -42)
def test_ubyte(self):
self.check_type(c_ubyte, 42)
def test_short(self):
self.check_type(c_short, 42)
self.check_type(c_short, -42)
def test_ushort(self):
self.check_type(c_ushort, 42)
def test_int(self):
self.check_type(c_int, 42)
self.check_type(c_int, -42)
def test_uint(self):
self.check_type(c_uint, 42)
def test_long(self):
self.check_type(c_long, 42)
self.check_type(c_long, -42)
def test_ulong(self):
self.check_type(c_ulong, 42)
def test_longlong(self):
self.check_type(c_longlong, 42)
self.check_type(c_longlong, -42)
def test_ulonglong(self):
self.check_type(c_ulonglong, 42)
def test_float(self):
# only almost equal: double -> float -> double
import math
self.check_type(c_float, math.e)
self.check_type(c_float, -math.e)
def test_double(self):
self.check_type(c_double, 3.14)
self.check_type(c_double, -3.14)
def test_longdouble(self):
self.check_type(c_longdouble, 3.14)
self.check_type(c_longdouble, -3.14)
def test_char(self):
self.check_type(c_char, b"x")
self.check_type(c_char, b"a")
# disabled: would now (correctly) raise a RuntimeWarning about
# a memory leak. A callback function cannot return a non-integral
# C type without causing a memory leak.
@unittest.skip('test disabled')
def test_char_p(self):
self.check_type(c_char_p, "abc")
self.check_type(c_char_p, "def")
def test_pyobject(self):
o = ()
from sys import getrefcount as grc
for o in (), [], object():
initial = grc(o)
# This call leaks a reference to 'o'...
self.check_type(py_object, o)
before = grc(o)
# ...but this call doesn't leak any more. Where is the refcount?
self.check_type(py_object, o)
after = grc(o)
self.assertEqual((after, o), (before, o))
def test_unsupported_restype_1(self):
# Only "fundamental" result types are supported for callback
# functions, the type must have a non-NULL stgdict->setfunc.
# POINTER(c_double), for example, is not supported.
prototype = self.functype.__func__(POINTER(c_double))
# The type is checked when the prototype is called
self.assertRaises(TypeError, prototype, lambda: None)
def test_unsupported_restype_2(self):
prototype = self.functype.__func__(object)
self.assertRaises(TypeError, prototype, lambda: None)
def test_issue_7959(self):
proto = self.functype.__func__(None)
class X(object):
def func(self): pass
def __init__(self):
self.v = proto(self.func)
import gc
for i in range(32):
X()
gc.collect()
live = [x for x in gc.get_objects()
if isinstance(x, X)]
self.assertEqual(len(live), 0)
def test_issue12483(self):
import gc
class Nasty:
def __del__(self):
gc.collect()
CFUNCTYPE(None)(lambda x=Nasty(): None)
@need_symbol('WINFUNCTYPE')
class StdcallCallbacks(Callbacks):
try:
functype = WINFUNCTYPE
except NameError:
pass
################################################################
class SampleCallbacksTestCase(unittest.TestCase):
def test_integrate(self):
# Derived from some then non-working code, posted by David Foster
dll = CDLL(_ctypes_test.__file__)
# The function prototype called by 'integrate': double func(double);
CALLBACK = CFUNCTYPE(c_double, c_double)
# The integrate function itself, exposed from the _ctypes_test dll
integrate = dll.integrate
integrate.argtypes = (c_double, c_double, CALLBACK, c_long)
integrate.restype = c_double
def func(x):
return x**2
result = integrate(0.0, 1.0, CALLBACK(func), 10)
diff = abs(result - 1./3.)
self.assertLess(diff, 0.01, "%s not less than 0.01" % diff)
def test_issue_8959_a(self):
from ctypes.util import find_library
libc_path = find_library("c")
if not libc_path:
self.skipTest('could not find libc')
libc = CDLL(libc_path)
@CFUNCTYPE(c_int, POINTER(c_int), POINTER(c_int))
def cmp_func(a, b):
return a[0] - b[0]
array = (c_int * 5)(5, 1, 99, 7, 33)
libc.qsort(array, len(array), sizeof(c_int), cmp_func)
self.assertEqual(array[:], [1, 5, 7, 33, 99])
@need_symbol('WINFUNCTYPE')
def test_issue_8959_b(self):
from ctypes.wintypes import BOOL, HWND, LPARAM
global windowCount
windowCount = 0
@WINFUNCTYPE(BOOL, HWND, LPARAM)
def EnumWindowsCallbackFunc(hwnd, lParam):
global windowCount
windowCount += 1
return True #Allow windows to keep enumerating
windll.user32.EnumWindows(EnumWindowsCallbackFunc, 0)
def test_callback_register_int(self):
# Issue #8275: buggy handling of callback args under Win64
# NOTE: should be run on release builds as well
dll = CDLL(_ctypes_test.__file__)
CALLBACK = CFUNCTYPE(c_int, c_int, c_int, c_int, c_int, c_int)
# All this function does is call the callback with its args squared
func = dll._testfunc_cbk_reg_int
func.argtypes = (c_int, c_int, c_int, c_int, c_int, CALLBACK)
func.restype = c_int
def callback(a, b, c, d, e):
return a + b + c + d + e
result = func(2, 3, 4, 5, 6, CALLBACK(callback))
self.assertEqual(result, callback(2*2, 3*3, 4*4, 5*5, 6*6))
def test_callback_register_double(self):
# Issue #8275: buggy handling of callback args under Win64
# NOTE: should be run on release builds as well
dll = CDLL(_ctypes_test.__file__)
CALLBACK = CFUNCTYPE(c_double, c_double, c_double, c_double,
c_double, c_double)
# All this function does is call the callback with its args squared
func = dll._testfunc_cbk_reg_double
func.argtypes = (c_double, c_double, c_double,
c_double, c_double, CALLBACK)
func.restype = c_double
def callback(a, b, c, d, e):
return a + b + c + d + e
result = func(1.1, 2.2, 3.3, 4.4, 5.5, CALLBACK(callback))
self.assertEqual(result,
callback(1.1*1.1, 2.2*2.2, 3.3*3.3, 4.4*4.4, 5.5*5.5))
def test_callback_large_struct(self):
class Check: pass
# This should mirror the structure in Modules/_ctypes/_ctypes_test.c
class X(Structure):
_fields_ = [
('first', c_ulong),
('second', c_ulong),
('third', c_ulong),
]
def callback(check, s):
check.first = s.first
check.second = s.second
check.third = s.third
# See issue #29565.
# The structure should be passed by value, so
# any changes to it should not be reflected in
# the value passed
s.first = s.second = s.third = 0x0badf00d
check = Check()
s = X()
s.first = 0xdeadbeef
s.second = 0xcafebabe
s.third = 0x0bad1dea
CALLBACK = CFUNCTYPE(None, X)
dll = CDLL(_ctypes_test.__file__)
func = dll._testfunc_cbk_large_struct
func.argtypes = (X, CALLBACK)
func.restype = None
# the function just calls the callback with the passed structure
func(s, CALLBACK(functools.partial(callback, check)))
self.assertEqual(check.first, s.first)
self.assertEqual(check.second, s.second)
self.assertEqual(check.third, s.third)
self.assertEqual(check.first, 0xdeadbeef)
self.assertEqual(check.second, 0xcafebabe)
self.assertEqual(check.third, 0x0bad1dea)
# See issue #29565.
# Ensure that the original struct is unchanged.
self.assertEqual(s.first, check.first)
self.assertEqual(s.second, check.second)
self.assertEqual(s.third, check.third)
################################################################
if __name__ == '__main__':
unittest.main()