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✏️ test_resource.py

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import unittest
from test import test_support
import time

resource = test_support.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, 42, 42)
        self.assertRaises(TypeError, resource.setrlimit)
        self.assertRaises(TypeError, resource.setrlimit, 42, 42, 42)

def test_fsize_ismax(self):
        try:
            (cur, max) = resource.getrlimit(resource.RLIMIT_FSIZE)
        except AttributeError:
            self.skipTest('RLIMIT_FSIZE not available')
        # 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))

def test_fsize_enforced(self):
        try:
            (cur, max) = resource.getrlimit(resource.RLIMIT_FSIZE)
        except AttributeError:
            self.skipTest('RLIMIT_FSIZE not available')
        # 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(test_support.TESTFN, "wb")
            try:
                f.write("X" * 1024)
                try:
                    f.write("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 IOError:
                    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))
            test_support.unlink(test_support.TESTFN)

def test_fsize_toobig(self):
        # Be sure that setrlimit is checking for really large values
        too_big = 10L**50
        try:
            (cur, max) = resource.getrlimit(resource.RLIMIT_FSIZE)
        except AttributeError:
            self.skipTest('RLIMIT_FSIZE not available')
        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

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

# Issue 6083: Reference counting bug
    def test_setrusage_refcount(self):
        try:
            limits = resource.getrlimit(resource.RLIMIT_CPU)
        except AttributeError:
            self.skipTest('RLIMIT_CPU not available')
        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_main(verbose=None):
    test_support.run_unittest(ResourceTest)

if __name__ == "__main__":
    test_main()

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✏️ test_resource.py