import contextlib import sys import unittest from test import support from test.support import import_helper from test.support import os_helper import time resource = import_helper.import_module('resource') # This test is checking a few specific problem spots with the resource module. class ResourceTest(unittest.TestCase): def test_args(self): self.assertRaises(TypeError, resource.getrlimit) self.assertRaises(TypeError, resource.getrlimit, 0, 42) self.assertRaises(OverflowError, resource.getrlimit, 2**1000) self.assertRaises(OverflowError, resource.getrlimit, -2**1000) self.assertRaises(TypeError, resource.getrlimit, '0') self.assertRaises(TypeError, resource.setrlimit) self.assertRaises(TypeError, resource.setrlimit, 0) self.assertRaises(TypeError, resource.setrlimit, 0, 42) self.assertRaises(TypeError, resource.setrlimit, 0, 42, 42) self.assertRaises(OverflowError, resource.setrlimit, 2**1000, (42, 42)) self.assertRaises(OverflowError, resource.setrlimit, -2**1000, (42, 42)) self.assertRaises(ValueError, resource.setrlimit, 0, (42,)) self.assertRaises(ValueError, resource.setrlimit, 0, (42, 42, 42)) self.assertRaises(TypeError, resource.setrlimit, '0', (42, 42)) self.assertRaises(TypeError, resource.setrlimit, 0, ('42', 42)) self.assertRaises(TypeError, resource.setrlimit, 0, (42, '42')) @unittest.skipIf(sys.platform == "vxworks", "setting RLIMIT_FSIZE is not supported on VxWorks") @unittest.skipUnless(hasattr(resource, 'RLIMIT_FSIZE'), 'requires resource.RLIMIT_FSIZE') def test_fsize_ismax(self): (cur, max) = resource.getrlimit(resource.RLIMIT_FSIZE) # RLIMIT_FSIZE should be RLIM_INFINITY, which will be a really big # number on a platform with large file support. On these platforms, # we need to test that the get/setrlimit functions properly convert # the number to a C long long and that the conversion doesn't raise # an error. self.assertEqual(resource.RLIM_INFINITY, max) resource.setrlimit(resource.RLIMIT_FSIZE, (cur, max)) @unittest.skipIf(sys.platform == "vxworks", "setting RLIMIT_FSIZE is not supported on VxWorks") @unittest.skipUnless(hasattr(resource, 'RLIMIT_FSIZE'), 'requires resource.RLIMIT_FSIZE') def test_fsize_enforced(self): (cur, max) = resource.getrlimit(resource.RLIMIT_FSIZE) # Check to see what happens when the RLIMIT_FSIZE is small. Some # versions of Python were terminated by an uncaught SIGXFSZ, but # pythonrun.c has been fixed to ignore that exception. If so, the # write() should return EFBIG when the limit is exceeded. # At least one platform has an unlimited RLIMIT_FSIZE and attempts # to change it raise ValueError instead. try: try: resource.setrlimit(resource.RLIMIT_FSIZE, (1024, max)) limit_set = True except ValueError: limit_set = False f = open(os_helper.TESTFN, "wb") try: f.write(b"X" * 1024) try: f.write(b"Y") f.flush() # On some systems (e.g., Ubuntu on hppa) the flush() # doesn't always cause the exception, but the close() # does eventually. Try flushing several times in # an attempt to ensure the file is really synced and # the exception raised. for i in range(5): time.sleep(.1) f.flush() except OSError: if not limit_set: raise if limit_set: # Close will attempt to flush the byte we wrote # Restore limit first to avoid getting a spurious error resource.setrlimit(resource.RLIMIT_FSIZE, (cur, max)) finally: f.close() finally: if limit_set: resource.setrlimit(resource.RLIMIT_FSIZE, (cur, max)) os_helper.unlink(os_helper.TESTFN) @unittest.skipIf(sys.platform == "vxworks", "setting RLIMIT_FSIZE is not supported on VxWorks") @unittest.skipUnless(hasattr(resource, 'RLIMIT_FSIZE'), 'requires resource.RLIMIT_FSIZE') def test_fsize_too_big(self): # Be sure that setrlimit is checking for really large values too_big = 10**50 (cur, max) = resource.getrlimit(resource.RLIMIT_FSIZE) try: resource.setrlimit(resource.RLIMIT_FSIZE, (too_big, max)) except (OverflowError, ValueError): pass try: resource.setrlimit(resource.RLIMIT_FSIZE, (max, too_big)) except (OverflowError, ValueError): pass @unittest.skipIf(sys.platform == "vxworks", "setting RLIMIT_FSIZE is not supported on VxWorks") @unittest.skipUnless(hasattr(resource, 'RLIMIT_FSIZE'), 'requires resource.RLIMIT_FSIZE') def test_fsize_not_too_big(self): (cur, max) = resource.getrlimit(resource.RLIMIT_FSIZE) self.addCleanup(resource.setrlimit, resource.RLIMIT_FSIZE, (cur, max)) def expected(cur): if resource.RLIM_INFINITY < 0: return [(cur, max), (resource.RLIM_INFINITY, max)] elif resource.RLIM_INFINITY < cur: return [(resource.RLIM_INFINITY, max)] else: return [(cur, max)] resource.setrlimit(resource.RLIMIT_FSIZE, (2**31-5, max)) self.assertEqual(resource.getrlimit(resource.RLIMIT_FSIZE), (2**31-5, max)) try: resource.setrlimit(resource.RLIMIT_FSIZE, (2**32, max)) except OverflowError: resource.setrlimit(resource.RLIMIT_FSIZE, (2**31, max)) self.assertIn(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**31)) resource.setrlimit(resource.RLIMIT_FSIZE, (2**32-5, max)) self.assertIn(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**32-5)) else: self.assertIn(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**32)) resource.setrlimit(resource.RLIMIT_FSIZE, (2**31, max)) self.assertEqual(resource.getrlimit(resource.RLIMIT_FSIZE), (2**31, max)) resource.setrlimit(resource.RLIMIT_FSIZE, (2**32-5, max)) self.assertEqual(resource.getrlimit(resource.RLIMIT_FSIZE), (2**32-5, max)) resource.setrlimit(resource.RLIMIT_FSIZE, (2**63-5, max)) self.assertIn(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**63-5)) try: resource.setrlimit(resource.RLIMIT_FSIZE, (2**63, max)) except ValueError: # There is a hard limit on macOS. pass else: self.assertIn(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**63)) resource.setrlimit(resource.RLIMIT_FSIZE, (2**64-5, max)) self.assertIn(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**64-5)) @unittest.skipIf(sys.platform == "vxworks", "setting RLIMIT_FSIZE is not supported on VxWorks") @unittest.skipUnless(hasattr(resource, 'RLIMIT_FSIZE'), 'requires resource.RLIMIT_FSIZE') def test_fsize_negative(self): (cur, max) = resource.getrlimit(resource.RLIMIT_FSIZE) for value in -5, -2**31, -2**32-5, -2**63, -2**64-5, -2**1000: with self.subTest(value=value): # This test assumes that the values don't map to RLIM_INFINITY, # though Posix doesn't guarantee it. self.assertNotEqual(value, resource.RLIM_INFINITY) self.assertRaises(ValueError, resource.setrlimit, resource.RLIMIT_FSIZE, (value, max)) self.assertRaises(ValueError, resource.setrlimit, resource.RLIMIT_FSIZE, (cur, value)) @unittest.skipUnless(hasattr(resource, "getrusage"), "needs getrusage") def test_getrusage(self): self.assertRaises(TypeError, resource.getrusage) self.assertRaises(TypeError, resource.getrusage, 42, 42) usageself = resource.getrusage(resource.RUSAGE_SELF) usagechildren = resource.getrusage(resource.RUSAGE_CHILDREN) # May not be available on all systems. try: usageboth = resource.getrusage(resource.RUSAGE_BOTH) except (ValueError, AttributeError): pass try: usage_thread = resource.getrusage(resource.RUSAGE_THREAD) except (ValueError, AttributeError): pass # Issue 6083: Reference counting bug @unittest.skipIf(sys.platform == "vxworks", "setting RLIMIT_CPU is not supported on VxWorks") @unittest.skipUnless(hasattr(resource, 'RLIMIT_CPU'), 'requires resource.RLIMIT_CPU') def test_setrusage_refcount(self): limits = resource.getrlimit(resource.RLIMIT_CPU) class BadSequence: def __len__(self): return 2 def __getitem__(self, key): if key in (0, 1): return len(tuple(range(1000000))) raise IndexError resource.setrlimit(resource.RLIMIT_CPU, BadSequence()) def test_pagesize(self): pagesize = resource.getpagesize() self.assertIsInstance(pagesize, int) self.assertGreaterEqual(pagesize, 0) @unittest.skipUnless(sys.platform in ('linux', 'android'), 'Linux only') def test_linux_constants(self): for attr in ['MSGQUEUE', 'NICE', 'RTPRIO', 'RTTIME', 'SIGPENDING']: with contextlib.suppress(AttributeError): self.assertIsInstance(getattr(resource, 'RLIMIT_' + attr), int) def test_freebsd_contants(self): for attr in ['SWAP', 'SBSIZE', 'NPTS']: with contextlib.suppress(AttributeError): self.assertIsInstance(getattr(resource, 'RLIMIT_' + attr), int) @unittest.skipUnless(hasattr(resource, 'prlimit'), 'no prlimit') @support.requires_linux_version(2, 6, 36) def test_prlimit(self): self.assertRaises(TypeError, resource.prlimit) self.assertRaises(ProcessLookupError, resource.prlimit, -1, resource.RLIMIT_AS) limit = resource.getrlimit(resource.RLIMIT_AS) self.assertEqual(resource.prlimit(0, resource.RLIMIT_AS), limit) self.assertEqual(resource.prlimit(0, resource.RLIMIT_AS, limit), limit) # Issue 20191: Reference counting bug @unittest.skipUnless(hasattr(resource, 'prlimit'), 'no prlimit') @support.requires_linux_version(2, 6, 36) def test_prlimit_refcount(self): class BadSeq: def __len__(self): return 2 def __getitem__(self, key): lim = limits[key] return lim - 1 if lim > 0 else lim + sys.maxsize*2 # new reference limits = resource.getrlimit(resource.RLIMIT_AS) self.assertEqual(resource.prlimit(0, resource.RLIMIT_AS, BadSeq()), limits) if __name__ == "__main__": unittest.main()