bpo-38631: Avoid Py_FatalError() in PyModule_Create2() (GH-18212)

If PyModule_Create2() is called when the Python import machinery is
not initialized, it now raises a SystemError and returns NULL,
instead of calling Py_FatalError() which aborts the process.

The caller must be prepared to handle NULL anyway.

1 files changed, 5 insertions, 2 deletions

diff --git a/Objects/moduleobject.c b/Objects/moduleobject.c
index 03c7381..912c258 100644
--- a/Objects/moduleobject.c
+++ b/Objects/moduleobject.c
@@ -173,8 +173,11 @@ _add_methods_to_object(PyObject *module, PyObject *name, PyMethodDef *functions)
 PyObject *
 PyModule_Create2(struct PyModuleDef* module, int module_api_version)
 {
-    if (!_PyImport_IsInitialized(_PyInterpreterState_Get()))
-        Py_FatalError("Python import machinery not initialized");
+    if (!_PyImport_IsInitialized(_PyInterpreterState_Get())) {
+        PyErr_SetString(PyExc_SystemError,
+                        "Python import machinery not initialized");
+        return NULL;
+    }
     return _PyModule_CreateInitialized(module, module_api_version);
 }