Issue #14599: Generalize a test for ImportError.path and add support

in Python/dynload_shlibs.c.

This should fix the remaining importlib test failure on Windows.
Support in AIX and HP-UX will be in a separate checkin.

Lib/test/test_imp.py

@@ -179,6 +179,17 @@ class ImportTests(unittest.TestCase):
         self.assertRaises(SyntaxError,
                           imp.find_module, "badsyntax_pep3120", [path])
 
+    def test_load_dynamic_ImportError_path(self):
+        # Issue #1559549 added `name` and `path` attributes to ImportError
+        # in order to provide better detail. Issue #10854 implemented those
+        # attributes on import failures of extensions on Windows.
+        path = 'bogus file path'
+        name = 'extension'
+        with self.assertRaises(ImportError) as err:
+            imp.load_dynamic(name, path)
+        self.assertIn(path, err.exception.path)
+        self.assertEqual(name, err.exception.name)
+
 
 class ReloadTests(unittest.TestCase):
 

Lib/test/test_import.py

@@ -337,28 +337,6 @@ class ImportTests(unittest.TestCase):
             del sys.path[0]
             remove_files(TESTFN)
 
-    @unittest.skipUnless(sys.platform == "win32", "Windows-specific")
-    def test_extension_import_fail(self):
-        # Issue 1559549 added `name` and `path` attributes to ImportError
-        # in order to provide better detail. Issue 10854 implemented those
-        # attributes on import failures of extensions on Windows.
-        debug = True if sys.executable[-6:] == "_d.exe" else False
-        pkg_name = "extension"
-        pkg_file = pkg_name + "{}".format("_d.pyd" if debug else ".pyd")
-        with open(pkg_file, "w"): pass
-        importlib.invalidate_caches()
-        try:
-            with self.assertRaises(ImportError) as err:
-                import extension
-            self.assertEqual(err.exception.name, pkg_name)
-            # The path we get back has the dot-slash, e.g., ".\\extension.pyd"
-            self.assertIsNotNone(err.exception.path,
-                'unexpected None for ImportError.path: '
-                '{!r}'.format(err.exception))
-            self.assertEqual(os.path.relpath(err.exception.path), pkg_file)
-        finally:
-            unlink(pkg_file)
-
 
 class PycRewritingTests(unittest.TestCase):
     # Test that the `co_filename` attribute on code objects always points

Python/dynload_shlib.c

@@ -129,10 +129,19 @@ dl_funcptr _PyImport_GetDynLoadFunc(const char *shortname,
     handle = dlopen(pathname, dlopenflags);
 
     if (handle == NULL) {
+        PyObject *mod_name = NULL;
+        PyObject *path = NULL;
+        PyObject *error_ob = NULL;
         const char *error = dlerror();
         if (error == NULL)
             error = "unknown dlopen() error";
-        PyErr_SetString(PyExc_ImportError, error);
+        error_ob = PyUnicode_FromString(error);
+        path = PyUnicode_FromString(pathname);
+        mod_name = PyUnicode_FromString(shortname);
+        PyErr_SetImportError(error_ob, mod_name, path);
+        Py_DECREF(error_ob);
+        Py_DECREF(path);
+        Py_DECREF(mod_name);
         return NULL;
     }
     if (fp != NULL && nhandles < 128)

Python/importdl.c

@@ -74,10 +74,11 @@ _PyImport_LoadDynamicModule(PyObject *name, PyObject *path, FILE *fp)
     if (PyErr_Occurred())
         goto error;
     if (p == NULL) {
-        PyErr_Format(PyExc_ImportError,
-                     "dynamic module does not define init function"
-                     " (PyInit_%s)",
+        PyObject *msg = PyUnicode_FromFormat("dynamic module does not define "
+                                             "init function (PyInit_%s)",
                                              shortname);
+        PyErr_SetImportError(msg, name, path);
+        Py_DECREF(msg);
         goto error;
     }
     oldcontext = _Py_PackageContext;