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bpo-31160: Fix test_random for zombie process #3045

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Merged
vstinner merged 1 commit into from
Aug 9, 2017
Merged

bpo-31160: Fix test_random for zombie process #3045

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8 changes: 7 additions & 1 deletion Lib/test/test_random.py
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Original file line number Diff line number Diff line change
Expand Up @@ -907,20 +907,26 @@ def __init__(self, newarg=None):
def test_after_fork(self):
# Test the global Random instance gets reseeded in child
r, w = os.pipe()
if os.fork() == 0:
pid = os.fork()
if pid == 0:
# child process
try:
val = random.getrandbits(128)
with open(w, "w") as f:
f.write(str(val))
finally:
os._exit(0)
else:
# parent process
os.close(w)
val = random.getrandbits(128)
with open(r, "r") as f:
child_val = eval(f.read())
self.assertNotEqual(val, child_val)

pid, status = os.waitpid(pid, 0)
self.assertEqual(status, 0)


if __name__ == "__main__":
unittest.main()