+#if !defined(OPENSSL_NO_DSO) && !defined(OPENSSL_USE_NODELETE)
+ {
+ union {
+ void *sym;
+ void (*func)(void);
+ } handlersym;
+
+ handlersym.func = handler;
+# ifdef DSO_WIN32
+ {
+ HMODULE handle = NULL;
+ BOOL ret;
+
+ /*
+ * We don't use the DSO route for WIN32 because there is a better
+ * way
+ */
+ ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
+ | GET_MODULE_HANDLE_EX_FLAG_PIN,
+ handlersym.sym, &handle);
+
+ if (!ret)
+ return 0;
+ }
+# else
+ /*
+ * Deliberately leak a reference to the handler. This will force the
+ * library/code containing the handler to remain loaded until we run the
+ * atexit handler. If -znodelete has been used then this is
+ * unneccessary.
+ */
+ {
+ DSO *dso = NULL;
+
+ ERR_set_mark();
+ dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
+ DSO_free(dso);
+ ERR_pop_to_mark();
+ }
+# endif
+ }
+#endif
+