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[3.7] bpo-22367: Add tests for fcntl.lockf(). (GH-17010) #17085

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Merged
merged 1 commit into from
Nov 9, 2019
Merged

[3.7] bpo-22367: Add tests for fcntl.lockf(). (GH-17010) #17085

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29 changes: 28 additions & 1 deletion Lib/test/test_fcntl.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,14 +5,14 @@
import struct
import sys
import unittest
from multiprocessing import Process
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:
Expand Down Expand Up @@ -138,6 +138,33 @@ def test_flock(self):
self.assertRaises(ValueError, fcntl.flock, -1, fcntl.LOCK_SH)
self.assertRaises(TypeError, fcntl.flock, 'spam', fcntl.LOCK_SH)

def test_lockf_exclusive(self):
self.f = open(TESTFN, 'wb+')
cmd = fcntl.LOCK_EX | fcntl.LOCK_NB
def try_lockf_on_other_process():
self.assertRaises(BlockingIOError, fcntl.lockf, self.f, cmd)

fcntl.lockf(self.f, cmd)
p = Process(target=try_lockf_on_other_process)
p.start()
p.join()
fcntl.lockf(self.f, fcntl.LOCK_UN)
self.assertEqual(p.exitcode, 0)

def test_lockf_share(self):
self.f = open(TESTFN, 'wb+')
cmd = fcntl.LOCK_SH | fcntl.LOCK_NB
def try_lockf_on_other_process():
fcntl.lockf(self.f, cmd)
fcntl.lockf(self.f, fcntl.LOCK_UN)

fcntl.lockf(self.f, cmd)
p = Process(target=try_lockf_on_other_process)
p.start()
p.join()
fcntl.lockf(self.f, fcntl.LOCK_UN)
self.assertEqual(p.exitcode, 0)

@cpython_only
def test_flock_overflow(self):
import _testcapi
Expand Down