1 // Copyright (C) 2021 The Android Open Source Project
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 //     http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 //! Provides utilities for Android user ids.
16 
17 pub use cutils_bindgen::AID_KEYSTORE;
18 pub use cutils_bindgen::AID_ROOT;
19 pub use cutils_bindgen::AID_SHELL;
20 pub use cutils_bindgen::AID_SYSTEM;
21 pub use cutils_bindgen::AID_USER_OFFSET;
22 
23 /// Gets the user id from a uid.
multiuser_get_user_id(uid: u32) -> u3224 pub fn multiuser_get_user_id(uid: u32) -> u32 {
25     uid / AID_USER_OFFSET
26 }
27 
28 /// Gets the app id from a uid.
multiuser_get_app_id(uid: u32) -> u3229 pub fn multiuser_get_app_id(uid: u32) -> u32 {
30     uid % AID_USER_OFFSET
31 }
32 
33 /// Gets the uid from a user id and app id.
multiuser_get_uid(user_id: u32, app_id: u32) -> u3234 pub fn multiuser_get_uid(user_id: u32, app_id: u32) -> u32 {
35     (user_id * AID_USER_OFFSET) + (app_id % AID_USER_OFFSET)
36 }
37