| // Copyright (C) 2021 The Android Open Source Project |
| // |
| // 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. |
| |
| //! Provides utilities for Android user ids. |
| |
| pub use cutils_bindgen::AID_KEYSTORE; |
| pub use cutils_bindgen::AID_ROOT; |
| pub use cutils_bindgen::AID_SHELL; |
| pub use cutils_bindgen::AID_SYSTEM; |
| pub use cutils_bindgen::AID_USER_OFFSET; |
| |
| /// Gets the user id from a uid. |
| pub fn multiuser_get_user_id(uid: u32) -> u32 { |
| uid / AID_USER_OFFSET |
| } |
| |
| /// Gets the app id from a uid. |
| pub fn multiuser_get_app_id(uid: u32) -> u32 { |
| uid % AID_USER_OFFSET |
| } |
| |
| /// Gets the uid from a user id and app id. |
| pub fn multiuser_get_uid(user_id: u32, app_id: u32) -> u32 { |
| (user_id * AID_USER_OFFSET) + (app_id % AID_USER_OFFSET) |
| } |