/usr/lib/python3.7/test/test_fcntl.py is in libpython3.7-testsuite 3.7.0~b3-1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | """Test program for the fcntl C module.
"""
import platform
import os
import struct
import sys
import unittest
from test.support import (verbose, TESTFN, unlink, run_unittest, import_module,
cpython_only)
# Skip test if no fcntl module.
fcntl = import_module('fcntl')
# TODO - Write tests for flock() and lockf().
def get_lockdata():
try:
os.O_LARGEFILE
except AttributeError:
start_len = "ll"
else:
start_len = "qq"
if (sys.platform.startswith(('netbsd', 'freebsd', 'openbsd'))
or sys.platform == 'darwin'):
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 ['aix3', 'aix4', '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
lockdata = get_lockdata()
class BadFile:
def __init__(self, fn):
self.fn = fn
def fileno(self):
return self.fn
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)
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)
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)
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):
from _testcapi import INT_MAX, 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',
"ARM Linux returns EINVAL for F_NOTIFY DN_MULTISHOT")
def test_fcntl_64_bit(self):
# Issue #1309352: fcntl shouldn't fail when the third arg fits in a
# C 'long' but not in a C 'int'.
try:
cmd = fcntl.F_NOTIFY
# This flag is larger than 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:
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)
@cpython_only
def test_flock_overflow(self):
import _testcapi
self.assertRaises(OverflowError, fcntl.flock, _testcapi.INT_MAX+1,
fcntl.LOCK_SH)
def test_main():
run_unittest(TestFcntl)
if __name__ == '__main__':
test_main()
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