| /* |
| * Copyright (C) 2011 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. |
| */ |
| |
| package android.os; |
| |
| /** |
| * @hide |
| */ |
| public final class UserId { |
| /** |
| * Range of IDs allocated for a user. |
| * |
| * @hide |
| */ |
| public static final int PER_USER_RANGE = 100000; |
| |
| public static final int USER_ALL = -1; |
| |
| /** |
| * Enable multi-user related side effects. Set this to false if there are problems with single |
| * user usecases. |
| * */ |
| public static final boolean MU_ENABLED = true; |
| |
| /** |
| * Checks to see if the user id is the same for the two uids, i.e., they belong to the same |
| * user. |
| * @hide |
| */ |
| public static final boolean isSameUser(int uid1, int uid2) { |
| return getUserId(uid1) == getUserId(uid2); |
| } |
| |
| /** |
| * Checks to see if both uids are referring to the same app id, ignoring the user id part of the |
| * uids. |
| * @param uid1 uid to compare |
| * @param uid2 other uid to compare |
| * @return whether the appId is the same for both uids |
| * @hide |
| */ |
| public static final boolean isSameApp(int uid1, int uid2) { |
| return getAppId(uid1) == getAppId(uid2); |
| } |
| |
| public static final boolean isIsolated(int uid) { |
| uid = getAppId(uid); |
| return uid >= Process.FIRST_ISOLATED_UID && uid <= Process.LAST_ISOLATED_UID; |
| } |
| |
| public static boolean isApp(int uid) { |
| if (uid > 0) { |
| uid = UserId.getAppId(uid); |
| return uid >= Process.FIRST_APPLICATION_UID && uid <= Process.LAST_APPLICATION_UID; |
| } else { |
| return false; |
| } |
| } |
| |
| /** |
| * Returns the user id for a given uid. |
| * @hide |
| */ |
| public static final int getUserId(int uid) { |
| if (MU_ENABLED) { |
| return uid / PER_USER_RANGE; |
| } else { |
| return 0; |
| } |
| } |
| |
| public static final int getCallingUserId() { |
| return getUserId(Binder.getCallingUid()); |
| } |
| |
| /** |
| * Returns the uid that is composed from the userId and the appId. |
| * @hide |
| */ |
| public static final int getUid(int userId, int appId) { |
| if (MU_ENABLED) { |
| return userId * PER_USER_RANGE + (appId % PER_USER_RANGE); |
| } else { |
| return appId; |
| } |
| } |
| |
| /** |
| * Returns the app id (or base uid) for a given uid, stripping out the user id from it. |
| * @hide |
| */ |
| public static final int getAppId(int uid) { |
| return uid % PER_USER_RANGE; |
| } |
| |
| /** |
| * Returns the user id of the current process |
| * @return user id of the current process |
| */ |
| public static final int myUserId() { |
| return getUserId(Process.myUid()); |
| } |
| } |