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I use sample code from [https://developer.apple.com/documentation/endpointsecurity/client?language=objc] but replace ES_EVENT_TYPE_AUTH_EXEC to ES_EVENT_TYPE_AUTH_OPEN, this is the full code: int main(int argc, const char** argv) { @autoreleasepool { es_client_t *client = NULL; es_new_client_result_t newClientResult = es_new_client(&client, ^(es_client_t * client, const es_message_t * message) { switch (message->event_type) { case ES_EVENT_TYPE_AUTH_OPEN: printf("auth open\n"); es_respond_auth_result(client, message, ES_AUTH_RESULT_ALLOW, true); break; default: panic("Found unexpected event type: %i", message->event_type); break; } }); // Handle any errors encountered while creating the client. switch (newClientResult) { case ES_NEW_CLIENT_RESULT_SUCCESS: // Client created successfully; continue. break; case ES_NEW_CLIENT_RESULT_ERR_NOT_ENTITLED: panic("Extension is missing entitlement."); break; case ES_NEW_CLIENT_RESULT_ERR_NOT_PRIVILEGED: panic ("Extension is not running as root."); break; case ES_NEW_CLIENT_RESULT_ERR_NOT_PERMITTED: // Prompt user to perform Transparency, Consent, // and Control (TCC) approval. // This error is recoverable; the user can try again after // approving the TCC prompt. // return YOUR_NEW_CLIENT_ERROR_CODE_PROMPT_TCC; break; case ES_NEW_CLIENT_RESULT_ERR_INVALID_ARGUMENT: panic ("Invalid argument to es_new_client(); client or handler was null."); break; case ES_NEW_CLIENT_RESULT_ERR_TOO_MANY_CLIENTS: panic ("Exceeded maximum number of simultaneously-connected ES clients."); break; case ES_NEW_CLIENT_RESULT_ERR_INTERNAL: panic ("Failed to connect to the Endpoint Security subsystem."); break; } // Subscribe the client to the ES_EVENT_TYPE_AUTH_EXEC event. // When the client receives a message with this event type, it must authorize // (allow or deny) the event. es_event_type_t eventTypes[1] = { ES_EVENT_TYPE_AUTH_OPEN }; es_return_t subscribeResult = es_subscribe(client, eventTypes, sizeof(eventTypes)); if (subscribeResult != ES_RETURN_SUCCESS) { panic ("Client failed to subscribe to event."); } NSRunLoop *runLoop = [NSRunLoop currentRunLoop]; [runLoop run]; } } I run this code in xcode, then mouse cursor be a colorful circle and rotating, application exited after about 10 seconds, xcode print: Message from debugger: Terminated due to signal 9 Program ended with exit code: 9 if I subscribe ES_EVENT_TYPE_NOTIFY_OPEN ES_EVENT_TYPE_NOTIFY_CLOSE, it works. What can I do for fix this?