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/*
* 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;
/**
* Representation of a user on the device.
* @hide
*/
public final class UserHandle {
/**
* Range of IDs allocated for a user.
*
* @hide
*/
public static final int PER_USER_RANGE = 100000;
/** A user id to indicate all users on the device */
public static final int USER_ALL = -1;
/** A user id to indicate the currently active user */
public static final int USER_CURRENT = -2;
/** A user id constant to indicate the "owner" user of the device */
public static final int USER_OWNER = 0;
/**
* 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 = UserHandle.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());
}
}
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