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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.assertGreater(resource.RLIM_INFINITY, 0)
self.assertEqual(resource.RLIM_INFINITY, max)
self.assertLessEqual(cur, max)
resource.setrlimit(resource.RLIMIT_FSIZE, (max, 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):
# The glibc wrapper functions use a 64-bit rlim_t data type,
# even on 32-bit platforms. If a program tried to set a resource
# limit to a value larger than can be represented in a 32-bit
# unsigned long, then the glibc setrlimit() wrapper function
# silently converted the limit value to RLIM_INFINITY.
if sys.maxsize < 2**32 <= cur <= resource.RLIM_INFINITY:
return [(resource.RLIM_INFINITY, max), (cur, max)]
return [(min(cur, resource.RLIM_INFINITY), max)]
resource.setrlimit(resource.RLIMIT_FSIZE, (2**31-5, max))
self.assertEqual(resource.getrlimit(resource.RLIMIT_FSIZE), (2**31-5, max))
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))
try:
resource.setrlimit(resource.RLIMIT_FSIZE, (2**32, max))
except OverflowError:
pass
else:
self.assertIn(resource.getrlimit(resource.RLIMIT_FSIZE), expected(2**32))
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):
self.assertGreater(resource.RLIM_INFINITY, 0)
(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):
self.assertRaises(ValueError, resource.setrlimit, resource.RLIMIT_FSIZE, (value, max))
self.assertRaises(ValueError, resource.setrlimit, resource.RLIMIT_FSIZE, (cur, value))
if resource.RLIM_INFINITY in (2**32-3, 2**32-1, 2**64-3, 2**64-1):
value = (resource.RLIM_INFINITY & 0xffff) - 0x10000
with self.assertWarnsRegex(DeprecationWarning, "RLIM_INFINITY"):
resource.setrlimit(resource.RLIMIT_FSIZE, (value, max))
with self.assertWarnsRegex(DeprecationWarning, "RLIM_INFINITY"):
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)
def test_contants(self):
self.assertIsInstance(resource.RLIM_INFINITY, int)
if sys.platform.startswith(('freebsd', 'solaris', 'sunos', 'aix')):
self.assertHasAttr(resource, 'RLIM_SAVED_CUR')
self.assertHasAttr(resource, 'RLIM_SAVED_MAX')
if hasattr(resource, 'RLIM_SAVED_CUR'):
self.assertIsInstance(resource.RLIM_SAVED_CUR, int)
self.assertIsInstance(resource.RLIM_SAVED_MAX, int)
@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', 'UMTXP', 'VMEM', 'PIPEBUF']:
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()
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