Added connection.pgconn_ptr and cursor.pgresult_ptr

Allow interacting with libpq in Python via ctypes.

See #782.

1 files changed, 14 insertions, 0 deletions

diff --git a/tests/testutils.py b/tests/testutils.py
index e4b6843..5f41789 100644
--- a/tests/testutils.py
+++ b/tests/testutils.py
@@ -26,10 +26,12 @@ import re
 import os
 import sys
 import types
+import ctypes
 import select
 import platform
 import unittest
 from functools import wraps
+from ctypes.util import find_library
 from .testconfig import dsn, repl_dsn
 from psycopg2.compat import text_type
 
@@ -174,6 +176,18 @@ class ConnectingTestCase(unittest.TestCase):
             else:
                 raise Exception("Unexpected result from poll: %r", state)
 
+    _libpq = None
+
+    @property
+    def libpq(self):
+        """Return a ctypes wrapper for the libpq library"""
+        if ConnectingTestCase._libpq is not None:
+            return ConnectingTestCase._libpq
+
+        libname = find_library('pq')
+        rv = ConnectingTestCase._libpq = ctypes.pydll.LoadLibrary(libname)
+        return rv
+
 
 def decorate_all_tests(obj, *decorators):
     """