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gh-155912: Handle PermissionError from os.sysconf under sandbox #155955

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05a627c
gh-155912: Handle PermissionError from os.sysconf under sandbox
imabd645 Aug 17, 2026
cfc8576
Add NEWS blurb for gh-155912
imabd645 Aug 17, 2026
e3ef07b
Remove trailing whitespace in test_process_pool.py
imabd645 Aug 17, 2026
a7946ad
Fix Sphinx lint in NEWS blurb
imabd645 Aug 17, 2026
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4 changes: 2 additions & 2 deletions Lib/concurrent/futures/process.py
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Original file line number Diff line number Diff line change
Expand Up @@ -700,8 +700,8 @@ def _check_system_limits():
raise NotImplementedError(_system_limited)
try:
nsems_max = os.sysconf("SC_SEM_NSEMS_MAX")
except (AttributeError, ValueError):
# sysconf not available or setting not available
except (AttributeError, ValueError, OSError):
# sysconf not available, setting not available, or read denied
return
if nsems_max == -1:
# indetermined limit, assume that limit is determined
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18 changes: 18 additions & 0 deletions Lib/test/test_concurrent_futures/test_process_pool.py
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Expand Up @@ -58,6 +58,24 @@ def test_max_workers_too_large(self):
"max_workers must be <= 61"):
futures.ProcessPoolExecutor(max_workers=62)

@unittest.skipUnless(hasattr(os, 'sysconf'), 'requires os.sysconf')
def test_sysconf_permission_error(self):
# Issue 155912: ProcessPoolExecutor should handle PermissionError
# from os.sysconf("SC_SEM_NSEMS_MAX") when running under a strict sandbox.
def mock_sysconf(name):
if name == "SC_SEM_NSEMS_MAX":
raise PermissionError(1, "Operation not permitted")
# If it asks for something else, let the real one handle it
# (though normally _check_system_limits only asks for SC_SEM_NSEMS_MAX)
return os_sysconf_orig(name)

os_sysconf_orig = os.sysconf
with unittest.mock.patch('os.sysconf', side_effect=mock_sysconf):
# Should construct without raising PermissionError
with futures.ProcessPoolExecutor(max_workers=1) as executor:
pass


@warnings_helper.ignore_fork_in_thread_deprecation_warnings()
def test_killed_child(self):
# When a child process is abruptly terminated, the whole pool gets
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2026-08-17-17-18-00.gh-issue-155912.abcdef.rst
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@@ -0,0 +1 @@
Handle :exc:`PermissionError` from :func:`os.sysconf` in ``concurrent.futures.ProcessPoolExecutor`` when running under a strict sandbox.
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