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import atexit import faulthandler import os import signal import sys import unittest from test import support from test.support.os_helper import TESTFN_UNDECODABLE, FS_NONASCII try: import gc except ImportError: gc = None from test.libregrtest.utils import (setup_unraisable_hook, setup_threading_excepthook) UNICODE_GUARD_ENV = "PYTHONREGRTEST_UNICODE_GUARD" def setup_tests(ns): try: stderr_fd = sys.__stderr__.fileno() except (ValueError, AttributeError): # Catch ValueError to catch io.UnsupportedOperation on TextIOBase # and ValueError on a closed stream. # # Catch AttributeError for stderr being None. stderr_fd = None else: # Display the Python traceback on fatal errors (e.g. segfault) faulthandler.enable(all_threads=True, file=stderr_fd) # Display the Python traceback on SIGALRM or SIGUSR1 signal signals = [] if hasattr(signal, 'SIGALRM'): signals.append(signal.SIGALRM) if hasattr(signal, 'SIGUSR1'): signals.append(signal.SIGUSR1) for signum in signals: faulthandler.register(signum, chain=True, file=stderr_fd) _adjust_resource_limits() replace_stdout() support.record_original_stdout(sys.stdout) if ns.testdir: # Prepend test directory to sys.path, so runtest() will be able # to locate tests sys.path.insert(0, os.path.abspath(ns.testdir)) # Some times __path__ and __file__ are not absolute (e.g. while running from # Lib/) and, if we change the CWD to run the tests in a temporary dir, some # imports might fail. This affects only the modules imported before os.chdir(). # These modules are searched first in sys.path[0] (so '' -- the CWD) and if # they are found in the CWD their __file__ and __path__ will be relative (this # happens before the chdir). All the modules imported after the chdir, are # not found in the CWD, and since the other paths in sys.path[1:] are absolute # (site.py absolutize them), the __file__ and __path__ will be absolute too. # Therefore it is necessary to absolutize manually the __file__ and __path__ of # the packages to prevent later imports to fail when the CWD is different. for module in sys.modules.values(): if hasattr(module, '__path__'): for index, path in enumerate(module.__path__): module.__path__[index] = os.path.abspath(path) if getattr(module, '__file__', None): module.__file__ = os.path.abspath(module.__file__) if ns.huntrleaks: unittest.BaseTestSuite._cleanup = False sys._deactivate_opcache() if ns.memlimit is not None: support.set_memlimit(ns.memlimit) if ns.threshold is not None: gc.set_threshold(ns.threshold) support.suppress_msvcrt_asserts(ns.verbose and ns.verbose >= 2) support.use_resources = ns.use_resources if hasattr(sys, 'addaudithook'): # Add an auditing hook for all tests to ensure PySys_Audit is tested def _test_audit_hook(name, args): pass sys.addaudithook(_test_audit_hook) setup_unraisable_hook() setup_threading_excepthook() if ns.timeout is not None: # For a slow buildbot worker, increase SHORT_TIMEOUT and LONG_TIMEOUT support.SHORT_TIMEOUT = max(support.SHORT_TIMEOUT, ns.timeout / 40) support.LONG_TIMEOUT = max(support.LONG_TIMEOUT, ns.timeout / 4) # If --timeout is short: reduce timeouts support.LOOPBACK_TIMEOUT = min(support.LOOPBACK_TIMEOUT, ns.timeout) support.INTERNET_TIMEOUT = min(support.INTERNET_TIMEOUT, ns.timeout) support.SHORT_TIMEOUT = min(support.SHORT_TIMEOUT, ns.timeout) support.LONG_TIMEOUT = min(support.LONG_TIMEOUT, ns.timeout) if ns.xmlpath: from test.support.testresult import RegressionTestResult RegressionTestResult.USE_XML = True # Ensure there's a non-ASCII character in env vars at all times to force # tests consider this case. See BPO-44647 for details. if TESTFN_UNDECODABLE and os.supports_bytes_environ: os.environb.setdefault(UNICODE_GUARD_ENV.encode(), TESTFN_UNDECODABLE) elif FS_NONASCII: os.environ.setdefault(UNICODE_GUARD_ENV, FS_NONASCII) def replace_stdout(): """Set stdout encoder error handler to backslashreplace (as stderr error handler) to avoid UnicodeEncodeError when printing a traceback""" stdout = sys.stdout try: fd = stdout.fileno() except ValueError: # On IDLE, sys.stdout has no file descriptor and is not a TextIOWrapper # object. Leaving sys.stdout unchanged. # # Catch ValueError to catch io.UnsupportedOperation on TextIOBase # and ValueError on a closed stream. return sys.stdout = open(fd, 'w', encoding=stdout.encoding, errors="backslashreplace", closefd=False, newline='\n') def restore_stdout(): sys.stdout.close() sys.stdout = stdout atexit.register(restore_stdout) def _adjust_resource_limits(): """Adjust the system resource limits (ulimit) if needed.""" try: import resource from resource import RLIMIT_NOFILE, RLIM_INFINITY except ImportError: return fd_limit, max_fds = resource.getrlimit(RLIMIT_NOFILE) # On macOS the default fd limit is sometimes too low (256) for our # test suite to succeed. Raise it to something more reasonable. # 1024 is a common Linux default. desired_fds = 1024 if fd_limit < desired_fds and fd_limit < max_fds: new_fd_limit = min(desired_fds, max_fds) try: resource.setrlimit(RLIMIT_NOFILE, (new_fd_limit, max_fds)) print(f"Raised RLIMIT_NOFILE: {fd_limit} -> {new_fd_limit}") except (ValueError, OSError) as err: print(f"Unable to raise RLIMIT_NOFILE from {fd_limit} to " f"{new_fd_limit}: {err}.")