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gh-107888: Fix test_mmap.test_access_parameter() on macOS 14 #109928

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merged 1 commit into from
Sep 26, 2023
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gh-107888: Fix test_mmap.test_access_parameter() on macOS 14 #109928

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13 changes: 9 additions & 4 deletions Lib/test/test_mmap.py
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Original file line number Diff line number Diff line change
Expand Up @@ -255,10 +255,15 @@ def test_access_parameter(self):
# Try writing with PROT_EXEC and without PROT_WRITE
prot = mmap.PROT_READ | getattr(mmap, 'PROT_EXEC', 0)
with open(TESTFN, "r+b") as f:
m = mmap.mmap(f.fileno(), mapsize, prot=prot)
self.assertRaises(TypeError, m.write, b"abcdef")
self.assertRaises(TypeError, m.write_byte, 0)
m.close()
try:
m = mmap.mmap(f.fileno(), mapsize, prot=prot)
except PermissionError:
# on macOS 14, PROT_READ | PROT_WRITE is not allowed
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perhaps make this a self.skipTest message?

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perhaps make this a self.skipTest message?

That's probably a good idea although there are plenty of other places in test_mmap that simply do a pass for similar types of failures.

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test_access_parameter() is a long function: 124 lines, it contains many tests. If someone wants to use skipTest() as some places, the function should be splitted into sub-functions. Otherwise, there is a risk that newly added code below will be skipped by mistake.

Today I lost 10 min trying to understand why the flush() call that I added at the end doesn't work as expected...

def display_header(use_resources: tuple[str, ...]):
    ...  # <=== a lot more code obviously

    # This makes it easier to remember what to set in your local
    # environment when trying to reproduce a sanitizer failure.
    asan = support.check_sanitizer(address=True)
    msan = support.check_sanitizer(memory=True)
    ubsan = support.check_sanitizer(ub=True)
    sanitizers = []
    if asan:
        sanitizers.append("address")
    if msan:
        sanitizers.append("memory")
    if ubsan:
        sanitizers.append("undefined behavior")
    if not sanitizers:
        return

    print(f"== sanitizers: {', '.join(sanitizers)}")
    for sanitizer, env_var in (
        (asan, "ASAN_OPTIONS"),
        (msan, "MSAN_OPTIONS"),
        (ubsan, "UBSAN_OPTIONS"),
    ):
        options= os.environ.get(env_var)
        if sanitizer and options is not None:
            print(f"== {env_var}={options!r}")

    sys.stdout.flush()  # <====== ADDED CODE ======

pass
else:
self.assertRaises(TypeError, m.write, b"abcdef")
self.assertRaises(TypeError, m.write_byte, 0)
m.close()

def test_bad_file_desc(self):
# Try opening a bad file descriptor...
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