[3.15] gh-154260: Fix test_flush_parameters on DragonFly BSD (GH-154261) (GH-154269)

https://github.com/python/cpython/commit/c6c1e9d7b42f3bbd0263a2f5bc18c8c318d1138e
commit: c6c1e9d7b42f3bbd0263a2f5bc18c8c318d1138e
branch: 3.15
author: Miss Islington (bot) <[email protected]>
committer: serhiy-storchaka <[email protected]>
date: 2026-07-20T18:22:59Z
summary:

[3.15] gh-154260: Fix test_flush_parameters on DragonFly BSD (GH-154261) (GH-154269)

DragonFly, like FreeBSD, rejects mmap.flush() with MS_ASYNC|MS_INVALIDATE
(EINVAL).  Use str.startswith() so the check also matches DragonFly, whose
sys.platform carries a version suffix.
(cherry picked from commit fc4d93dcf1a01f56fd8ffc35b6d3700c98ffa6c9)

Co-authored-by: Serhiy Storchaka <[email protected]>
Co-authored-by: Claude Fable 5 <[email protected]>

files:
M Lib/test/test_mmap.py

diff --git a/Lib/test/test_mmap.py b/Lib/test/test_mmap.py
index 5be9dfac2f5a76..55c6ad04d44d82 100644
--- a/Lib/test/test_mmap.py
+++ b/Lib/test/test_mmap.py
@@ -1176,8 +1176,8 @@ def test_flush_parameters(self):
             if hasattr(mmap, 'MS_INVALIDATE'):
                 m.flush(PAGESIZE * 2, flags=mmap.MS_INVALIDATE)
             if hasattr(mmap, 'MS_ASYNC') and hasattr(mmap, 'MS_INVALIDATE'):
-                if sys.platform == 'freebsd':
-                    # FreeBSD doesn't support this combination
+                if sys.platform.startswith(('freebsd', 'dragonfly')):
+                    # FreeBSD and DragonFly don't support this combination
                     with self.assertRaises(OSError) as cm:
                         m.flush(0, PAGESIZE, flags=mmap.MS_ASYNC | mmap.MS_INVALIDATE)
                     self.assertEqual(cm.exception.errno, errno.EINVAL)

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