[3.11] gh-117061: Fix test_posix.test_sched_setaffinity() on RHEL9 (GH-117126) (...

gh-117061: Fix test_posix.test_sched_setaffinity() on RHEL9 (GH-117126)

On RHEL9, sched_setaffinity(0, []) does not fail.
(cherry picked from commit 50f9b0b1e0fb181875751cef951351ed007b6397)

Co-authored-by: Victor Stinner <vstinner@python.org>

diff --git a/Lib/test/test_posix.py b/Lib/test/test_posix.py
index c2103313d26fcf0c2ea7bed8e3cb8cea49d0eed0..221d25a4d62420434793b3b6bf443815fa38962c 100644 (file)
--- a/Lib/test/test_posix.py
+++ b/Lib/test/test_posix.py
@@ -1327,12 +1327,21 @@ class PosixTester(unittest.TestCase):
     def test_sched_setaffinity(self):
         mask = posix.sched_getaffinity(0)
         self.addCleanup(posix.sched_setaffinity, 0, list(mask))
+
         if len(mask) > 1:
             # Empty masks are forbidden
             mask.pop()
         posix.sched_setaffinity(0, mask)
         self.assertEqual(posix.sched_getaffinity(0), mask)
-        self.assertRaises(OSError, posix.sched_setaffinity, 0, [])
+
+        try:
+            posix.sched_setaffinity(0, [])
+            # gh-117061: On RHEL9, sched_setaffinity(0, []) does not fail
+        except OSError:
+            # sched_setaffinity() manual page documents EINVAL error
+            # when the mask is empty.
+            pass
+
         self.assertRaises(ValueError, posix.sched_setaffinity, 0, [-10])
         self.assertRaises(ValueError, posix.sched_setaffinity, 0, map(int, "0X"))
         self.assertRaises(OverflowError, posix.sched_setaffinity, 0, [1<<128])