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pypy-postgresql / lib-python / 2.7 / ctypes / test / test_loading.py

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from ctypes import *
import sys, unittest
import os
from ctypes.util import find_library
from ctypes.test import is_resource_enabled, xfail

libc_name = None
if os.name == "nt":
    libc_name = find_library("c")
elif os.name == "ce":
    libc_name = "coredll"
elif sys.platform == "cygwin":
    libc_name = "cygwin1.dll"
else:
    libc_name = find_library("c")

if is_resource_enabled("printing"):
    print "libc_name is", libc_name

class LoaderTest(unittest.TestCase):

    unknowndll = "xxrandomnamexx"

    if libc_name is not None:
        def test_load(self):
            CDLL(libc_name)
            CDLL(os.path.basename(libc_name))
            self.assertRaises(OSError, CDLL, self.unknowndll)

    if libc_name is not None and os.path.basename(libc_name) == "libc.so.6":
        def test_load_version(self):
            cdll.LoadLibrary("libc.so.6")
            # linux uses version, libc 9 should not exist
            self.assertRaises(OSError, cdll.LoadLibrary, "libc.so.9")
            self.assertRaises(OSError, cdll.LoadLibrary, self.unknowndll)

    def test_find(self):
        for name in ("c", "m"):
            lib = find_library(name)
            if lib:
                cdll.LoadLibrary(lib)
                CDLL(lib)

    if os.name in ("nt", "ce"):
        def test_load_library(self):
            self.assertFalse(libc_name is None)
            if is_resource_enabled("printing"):
                print find_library("kernel32")
                print find_library("user32")

            if os.name == "nt":
                windll.kernel32.GetModuleHandleW
                windll["kernel32"].GetModuleHandleW
                windll.LoadLibrary("kernel32").GetModuleHandleW
                WinDLL("kernel32").GetModuleHandleW
            elif os.name == "ce":
                windll.coredll.GetModuleHandleW
                windll["coredll"].GetModuleHandleW
                windll.LoadLibrary("coredll").GetModuleHandleW
                WinDLL("coredll").GetModuleHandleW

        def test_load_ordinal_functions(self):
            import _ctypes_test
            dll = WinDLL(_ctypes_test.__file__)
            # We load the same function both via ordinal and name
            func_ord = dll[2]
            func_name = dll.GetString
            # addressof gets the address where the function pointer is stored
            a_ord = addressof(func_ord)
            a_name = addressof(func_name)
            f_ord_addr = c_void_p.from_address(a_ord).value
            f_name_addr = c_void_p.from_address(a_name).value
            self.assertEqual(hex(f_ord_addr), hex(f_name_addr))

            self.assertRaises(AttributeError, dll.__getitem__, 1234)

    if os.name == "nt":
        @xfail
        def test_1703286_A(self):
            from _ctypes import LoadLibrary, FreeLibrary
            # On winXP 64-bit, advapi32 loads at an address that does
            # NOT fit into a 32-bit integer.  FreeLibrary must be able
            # to accept this address.

            # These are tests for http://www.python.org/sf/1703286
            handle = LoadLibrary("advapi32")
            FreeLibrary(handle)

        @xfail
        def test_1703286_B(self):
            # Since on winXP 64-bit advapi32 loads like described
            # above, the (arbitrarily selected) CloseEventLog function
            # also has a high address.  'call_function' should accept
            # addresses so large.
            from _ctypes import call_function
            advapi32 = windll.advapi32
            # Calling CloseEventLog with a NULL argument should fail,
            # but the call should not segfault or so.
            self.assertEqual(0, advapi32.CloseEventLog(None))
            windll.kernel32.GetProcAddress.argtypes = c_void_p, c_char_p
            windll.kernel32.GetProcAddress.restype = c_void_p
            proc = windll.kernel32.GetProcAddress(advapi32._handle, "CloseEventLog")
            self.assertTrue(proc)
            # This is the real test: call the function via 'call_function'
            self.assertEqual(0, call_function(proc, (None,)))

if __name__ == "__main__":
    unittest.main()