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
|
"""Test program for the fcntl C module.
"""
import errno
import multiprocessing
import platform
import os
import struct
import sys
import unittest
from test.support import (
cpython_only, get_pagesize, is_apple, requires_subprocess, verbose
)
from test.support.import_helper import import_module
from test.support.os_helper import TESTFN, unlink, make_bad_fd
# Skip test if no fcntl module.
fcntl = import_module('fcntl')
class BadFile:
def __init__(self, fn):
self.fn = fn
def fileno(self):
return self.fn
def try_lockf_on_other_process_fail(fname, cmd):
f = open(fname, 'wb+')
try:
fcntl.lockf(f, cmd)
except BlockingIOError:
pass
finally:
f.close()
def try_lockf_on_other_process(fname, cmd):
f = open(fname, 'wb+')
fcntl.lockf(f, cmd)
fcntl.lockf(f, fcntl.LOCK_UN)
f.close()
class TestFcntl(unittest.TestCase):
def setUp(self):
self.f = None
def tearDown(self):
if self.f and not self.f.closed:
self.f.close()
unlink(TESTFN)
@staticmethod
def get_lockdata():
try:
os.O_LARGEFILE
except AttributeError:
start_len = "ll"
else:
start_len = "qq"
if (
sys.platform.startswith(('netbsd', 'freebsd', 'openbsd'))
or is_apple
):
if struct.calcsize('l') == 8:
off_t = 'l'
pid_t = 'i'
else:
off_t = 'lxxxx'
pid_t = 'l'
lockdata = struct.pack(off_t + off_t + pid_t + 'hh', 0, 0, 0,
fcntl.F_WRLCK, 0)
elif sys.platform.startswith('gnukfreebsd'):
lockdata = struct.pack('qqihhi', 0, 0, 0, fcntl.F_WRLCK, 0, 0)
elif sys.platform in ['hp-uxB', 'unixware7']:
lockdata = struct.pack('hhlllii', fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
else:
lockdata = struct.pack('hh'+start_len+'hh', fcntl.F_WRLCK, 0, 0, 0, 0, 0)
if lockdata:
if verbose:
print('struct.pack: ', repr(lockdata))
return lockdata
def test_fcntl_fileno(self):
# the example from the library docs
self.f = open(TESTFN, 'wb')
rv = fcntl.fcntl(self.f.fileno(), fcntl.F_SETFL, os.O_NONBLOCK)
if verbose:
print('Status from fcntl with O_NONBLOCK: ', rv)
lockdata = self.get_lockdata()
rv = fcntl.fcntl(self.f.fileno(), fcntl.F_SETLKW, lockdata)
if verbose:
print('String from fcntl with F_SETLKW: ', repr(rv))
self.f.close()
def test_fcntl_file_descriptor(self):
# again, but pass the file rather than numeric descriptor
self.f = open(TESTFN, 'wb')
rv = fcntl.fcntl(self.f, fcntl.F_SETFL, os.O_NONBLOCK)
if verbose:
print('Status from fcntl with O_NONBLOCK: ', rv)
lockdata = self.get_lockdata()
rv = fcntl.fcntl(self.f, fcntl.F_SETLKW, lockdata)
if verbose:
print('String from fcntl with F_SETLKW: ', repr(rv))
self.f.close()
def test_fcntl_bad_file(self):
with self.assertRaises(ValueError):
fcntl.fcntl(-1, fcntl.F_SETFL, os.O_NONBLOCK)
with self.assertRaises(ValueError):
fcntl.fcntl(BadFile(-1), fcntl.F_SETFL, os.O_NONBLOCK)
with self.assertRaises(TypeError):
fcntl.fcntl('spam', fcntl.F_SETFL, os.O_NONBLOCK)
with self.assertRaises(TypeError):
fcntl.fcntl(BadFile('spam'), fcntl.F_SETFL, os.O_NONBLOCK)
@cpython_only
def test_fcntl_bad_file_overflow(self):
_testcapi = import_module("_testcapi")
INT_MAX = _testcapi.INT_MAX
INT_MIN = _testcapi.INT_MIN
# Issue 15989
with self.assertRaises(OverflowError):
fcntl.fcntl(INT_MAX + 1, fcntl.F_SETFL, os.O_NONBLOCK)
with self.assertRaises(OverflowError):
fcntl.fcntl(BadFile(INT_MAX + 1), fcntl.F_SETFL, os.O_NONBLOCK)
with self.assertRaises(OverflowError):
fcntl.fcntl(INT_MIN - 1, fcntl.F_SETFL, os.O_NONBLOCK)
with self.assertRaises(OverflowError):
fcntl.fcntl(BadFile(INT_MIN - 1), fcntl.F_SETFL, os.O_NONBLOCK)
@unittest.skipIf(
(platform.machine().startswith("arm") and platform.system() == "Linux")
or platform.system() == "Android",
"this platform returns EINVAL for F_NOTIFY DN_MULTISHOT")
def test_fcntl_64_bit(self):
# Issue GH-42434: fcntl shouldn't fail when the third arg fits in a
# C 'long' but not in a C 'int'.
try:
cmd = fcntl.F_NOTIFY
# DN_MULTISHOT is >= 2**31 in 64-bit builds
flags = fcntl.DN_MULTISHOT
except AttributeError:
self.skipTest("F_NOTIFY or DN_MULTISHOT unavailable")
fd = os.open(os.path.dirname(os.path.abspath(TESTFN)), os.O_RDONLY)
try:
try:
fcntl.fcntl(fd, cmd, fcntl.DN_DELETE)
except OSError as exc:
if exc.errno == errno.EINVAL:
self.skipTest("F_NOTIFY not available by this environment")
fcntl.fcntl(fd, cmd, flags)
finally:
os.close(fd)
def test_flock(self):
# Solaris needs readable file for shared lock
self.f = open(TESTFN, 'wb+')
fileno = self.f.fileno()
fcntl.flock(fileno, fcntl.LOCK_SH)
fcntl.flock(fileno, fcntl.LOCK_UN)
fcntl.flock(self.f, fcntl.LOCK_SH | fcntl.LOCK_NB)
fcntl.flock(self.f, fcntl.LOCK_UN)
fcntl.flock(fileno, fcntl.LOCK_EX)
fcntl.flock(fileno, fcntl.LOCK_UN)
self.assertRaises(ValueError, fcntl.flock, -1, fcntl.LOCK_SH)
self.assertRaises(TypeError, fcntl.flock, 'spam', fcntl.LOCK_SH)
@unittest.skipIf(platform.system() == "AIX", "AIX returns PermissionError")
@requires_subprocess()
def test_lockf_exclusive(self):
self.f = open(TESTFN, 'wb+')
cmd = fcntl.LOCK_EX | fcntl.LOCK_NB
fcntl.lockf(self.f, cmd)
mp = multiprocessing.get_context('spawn')
p = mp.Process(target=try_lockf_on_other_process_fail, args=(TESTFN, cmd))
p.start()
p.join()
fcntl.lockf(self.f, fcntl.LOCK_UN)
self.assertEqual(p.exitcode, 0)
@unittest.skipIf(platform.system() == "AIX", "AIX returns PermissionError")
@requires_subprocess()
def test_lockf_share(self):
self.f = open(TESTFN, 'wb+')
cmd = fcntl.LOCK_SH | fcntl.LOCK_NB
fcntl.lockf(self.f, cmd)
mp = multiprocessing.get_context('spawn')
p = mp.Process(target=try_lockf_on_other_process, args=(TESTFN, cmd))
p.start()
p.join()
fcntl.lockf(self.f, fcntl.LOCK_UN)
self.assertEqual(p.exitcode, 0)
@cpython_only
def test_flock_overflow(self):
_testcapi = import_module("_testcapi")
self.assertRaises(OverflowError, fcntl.flock, _testcapi.INT_MAX+1,
fcntl.LOCK_SH)
@unittest.skipIf(sys.platform != 'darwin', "F_GETPATH is only available on macos")
def test_fcntl_f_getpath(self):
self.f = open(TESTFN, 'wb')
expected = os.path.abspath(TESTFN).encode('utf-8')
res = fcntl.fcntl(self.f.fileno(), fcntl.F_GETPATH, bytes(len(expected)))
self.assertEqual(expected, res)
@unittest.skipUnless(
hasattr(fcntl, "F_SETPIPE_SZ") and hasattr(fcntl, "F_GETPIPE_SZ"),
"F_SETPIPE_SZ and F_GETPIPE_SZ are not available on all platforms.")
def test_fcntl_f_pipesize(self):
test_pipe_r, test_pipe_w = os.pipe()
try:
# Get the default pipesize with F_GETPIPE_SZ
pipesize_default = fcntl.fcntl(test_pipe_w, fcntl.F_GETPIPE_SZ)
pipesize = pipesize_default // 2 # A new value to detect change.
pagesize_default = get_pagesize()
if pipesize < pagesize_default: # the POSIX minimum
raise unittest.SkipTest(
'default pipesize too small to perform test.')
fcntl.fcntl(test_pipe_w, fcntl.F_SETPIPE_SZ, pipesize)
self.assertEqual(fcntl.fcntl(test_pipe_w, fcntl.F_GETPIPE_SZ),
pipesize)
finally:
os.close(test_pipe_r)
os.close(test_pipe_w)
@unittest.skipUnless(hasattr(fcntl, 'F_DUPFD'), 'need fcntl.F_DUPFD')
def test_bad_fd(self):
# gh-134744: Test error handling
fd = make_bad_fd()
with self.assertRaises(OSError):
fcntl.fcntl(fd, fcntl.F_DUPFD, 0)
with self.assertRaises(OSError):
fcntl.fcntl(fd, fcntl.F_DUPFD, b'\0' * 1024)
if __name__ == '__main__':
unittest.main()
|
