Import of the watch repository from Pebble

src/fw/shell/system_app_state_machine.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "process_management/pebble_process_md.h"
+#include "process_management/app_install_types.h"
+
+//! Get the very first app we should run at startup.
+const PebbleProcessMd* system_app_state_machine_system_start(void);
+
+//! Retrieve the app that was last launched prior to the current one.
+AppInstallId system_app_state_machine_get_last_registered_app(void);
+
+//! Get the app we should launch after an app has crashed or has been force quit.
+const PebbleProcessMd* system_app_state_machine_get_default_app(void);
+
+//! Tell the state machine we just launched an app.
+void system_app_state_machine_register_app_launch(AppInstallId app_id);
+
+//! Stop the normal state machine! Just show the panic app.
+void system_app_state_machine_panic(void);
+