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bpo-41586: Attempt to make the pipesize tests more robust. (GH-22839)

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Several buildbots are failing on these, likely due to an inability to
set the pipe size to the desired test value.
This commit is contained in:
Gregory P. Smith 2020-10-20 17:37:20 -07:00 • committed by GitHub
parent 7cdf30fff3
commit 786addd9d0
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2 changed files with 73 additions and 45 deletions
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25
Lib/test/test_fcntl.py
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@ -190,17 +190,24 @@ class TestFcntl(unittest.TestCase):
res = fcntl.fcntl(self.f.fileno(), fcntl.F_GETPATH, bytes(len(expected)))
self.assertEqual(expected, res)
@unittest.skipIf(not (hasattr(fcntl, "F_SETPIPE_SZ") and hasattr(fcntl, "F_GETPIPE_SZ")),
"F_SETPIPE_SZ and F_GETPIPE_SZ are not available on all unix platforms.")
@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()
# Get the default pipesize with F_GETPIPE_SZ
pipesize_default = fcntl.fcntl(test_pipe_w, fcntl.F_GETPIPE_SZ)
# Multiply the default with 2 to get a new value.
fcntl.fcntl(test_pipe_w, fcntl.F_SETPIPE_SZ, pipesize_default * 2)
self.assertEqual(fcntl.fcntl(test_pipe_w, fcntl.F_GETPIPE_SZ), pipesize_default * 2)
os.close(test_pipe_r)
os.close(test_pipe_w)
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.
if pipesize < 512: # the POSIX minimum
raise unittest.SkitTest(
'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)
def test_main():