[3.15] gh-154441: Skip the scheduler tests if the API requires privileges (GH-154442...

DragonFly BSD requires privileges to use the scheduler API, even for
the calling process.
(cherry picked from commit cbd15390e474e254ad2590c57de7e3bf657c0a09)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

diff --git a/Lib/test/test_os/test_posix.py b/Lib/test/test_os/test_posix.py
index c0cbc3e4e2e7d1c41abff42c724489b9fd915a29..38066a5426090a20bf9213ca45057eb007300665 100644 (file)
--- a/Lib/test/test_os/test_posix.py
+++ b/Lib/test/test_os/test_posix.py
@@ -46,7 +46,8 @@ def _supports_sched():
     try:
         posix.sched_getscheduler(0)
     except OSError as e:
-        if e.errno == errno.ENOSYS:
+        # DragonFly BSD requires privileges to use the scheduler API.
+        if e.errno in (errno.ENOSYS, errno.EPERM):
             return False
     return True
 
@@ -1451,6 +1452,7 @@ class PosixTester(unittest.TestCase):
         del sched_priority, param  # should not crash
         support.gc_collect()  # just to be sure
 
+    @requires_sched
     @unittest.skipUnless(hasattr(posix, "sched_rr_get_interval"), "no function")
     def test_sched_rr_get_interval(self):
         try: