| /* |
| * 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; |
| |
| import java.io.PrintWriter; |
| |
| /** |
| * Representation of a user on the device. |
| */ |
| public final class UserHandle implements Parcelable { |
| /** |
| * @hide Range of uids allocated for a user. |
| */ |
| public static final int PER_USER_RANGE = 100000; |
| |
| /** @hide A user id to indicate all users on the device */ |
| public static final int USER_ALL = -1; |
| |
| /** @hide A user handle to indicate all users on the device */ |
| public static final UserHandle ALL = new UserHandle(USER_ALL); |
| |
| /** @hide A user id to indicate the currently active user */ |
| public static final int USER_CURRENT = -2; |
| |
| /** @hide A user handle to indicate the current user of the device */ |
| public static final UserHandle CURRENT = new UserHandle(USER_CURRENT); |
| |
| /** @hide A user id to indicate that we would like to send to the current |
| * user, but if this is calling from a user process then we will send it |
| * to the caller's user instead of failing wiht a security exception */ |
| public static final int USER_CURRENT_OR_SELF = -3; |
| |
| /** @hide A user handle to indicate that we would like to send to the current |
| * user, but if this is calling from a user process then we will send it |
| * to the caller's user instead of failing wiht a security exception */ |
| public static final UserHandle CURRENT_OR_SELF = new UserHandle(USER_CURRENT_OR_SELF); |
| |
| /** @hide An undefined user id */ |
| public static final int USER_NULL = -10000; |
| |
| /** @hide A user id constant to indicate the "owner" user of the device */ |
| public static final int USER_OWNER = 0; |
| |
| /** @hide A user handle to indicate the primary/owner user of the device */ |
| public static final UserHandle OWNER = new UserHandle(USER_OWNER); |
| |
| /** |
| * @hide Enable multi-user related side effects. Set this to false if |
| * there are problems with single user use-cases. |
| */ |
| public static final boolean MU_ENABLED = true; |
| |
| final int mHandle; |
| |
| /** |
| * 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); |
| } |
| |
| /** @hide */ |
| public static final boolean isIsolated(int uid) { |
| if (uid > 0) { |
| final int appId = getAppId(uid); |
| return appId >= Process.FIRST_ISOLATED_UID && appId <= Process.LAST_ISOLATED_UID; |
| } else { |
| return false; |
| } |
| } |
| |
| /** @hide */ |
| public static boolean isApp(int uid) { |
| if (uid > 0) { |
| final int appId = getAppId(uid); |
| return appId >= Process.FIRST_APPLICATION_UID && appId <= 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; |
| } |
| } |
| |
| /** @hide */ |
| 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 shared app gid for a given uid or appId. |
| * @hide |
| */ |
| public static final int getSharedAppGid(int id) { |
| return Process.FIRST_SHARED_APPLICATION_GID + (id % PER_USER_RANGE) |
| - Process.FIRST_APPLICATION_UID; |
| } |
| |
| /** |
| * Generate a text representation of the uid, breaking out its individual |
| * components -- user, app, isolated, etc. |
| * @hide |
| */ |
| public static void formatUid(StringBuilder sb, int uid) { |
| if (uid < Process.FIRST_APPLICATION_UID) { |
| sb.append(uid); |
| } else { |
| sb.append('u'); |
| sb.append(getUserId(uid)); |
| final int appId = getAppId(uid); |
| if (appId >= Process.FIRST_ISOLATED_UID && appId <= Process.LAST_ISOLATED_UID) { |
| sb.append('i'); |
| sb.append(appId - Process.FIRST_ISOLATED_UID); |
| } else { |
| sb.append('a'); |
| sb.append(appId); |
| } |
| } |
| } |
| |
| /** |
| * Generate a text representation of the uid, breaking out its individual |
| * components -- user, app, isolated, etc. |
| * @hide |
| */ |
| public static void formatUid(PrintWriter pw, int uid) { |
| if (uid < Process.FIRST_APPLICATION_UID) { |
| pw.print(uid); |
| } else { |
| pw.print('u'); |
| pw.print(getUserId(uid)); |
| final int appId = getAppId(uid); |
| if (appId >= Process.FIRST_ISOLATED_UID && appId <= Process.LAST_ISOLATED_UID) { |
| pw.print('i'); |
| pw.print(appId - Process.FIRST_ISOLATED_UID); |
| } else { |
| pw.print('a'); |
| pw.print(appId); |
| } |
| } |
| } |
| |
| /** |
| * Returns the user id of the current process |
| * @return user id of the current process |
| * @hide |
| */ |
| public static final int myUserId() { |
| return getUserId(Process.myUid()); |
| } |
| |
| /** @hide */ |
| public UserHandle(int h) { |
| mHandle = h; |
| } |
| |
| /** @hide */ |
| public int getIdentifier() { |
| return mHandle; |
| } |
| |
| @Override |
| public String toString() { |
| return "UserHandle{" + mHandle + "}"; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| try { |
| if (obj != null) { |
| UserHandle other = (UserHandle)obj; |
| return mHandle == other.mHandle; |
| } |
| } catch (ClassCastException e) { |
| } |
| return false; |
| } |
| |
| @Override |
| public int hashCode() { |
| return mHandle; |
| } |
| |
| public int describeContents() { |
| return 0; |
| } |
| |
| public void writeToParcel(Parcel out, int flags) { |
| out.writeInt(mHandle); |
| } |
| |
| /** |
| * Write a UserHandle to a Parcel, handling null pointers. Must be |
| * read with {@link #readFromParcel(Parcel)}. |
| * |
| * @param h The UserHandle to be written. |
| * @param out The Parcel in which the UserHandle will be placed. |
| * |
| * @see #readFromParcel(Parcel) |
| */ |
| public static void writeToParcel(UserHandle h, Parcel out) { |
| if (h != null) { |
| h.writeToParcel(out, 0); |
| } else { |
| out.writeInt(USER_NULL); |
| } |
| } |
| |
| /** |
| * Read a UserHandle from a Parcel that was previously written |
| * with {@link #writeToParcel(UserHandle, Parcel)}, returning either |
| * a null or new object as appropriate. |
| * |
| * @param in The Parcel from which to read the UserHandle |
| * @return Returns a new UserHandle matching the previously written |
| * object, or null if a null had been written. |
| * |
| * @see #writeToParcel(UserHandle, Parcel) |
| */ |
| public static UserHandle readFromParcel(Parcel in) { |
| int h = in.readInt(); |
| return h != USER_NULL ? new UserHandle(h) : null; |
| } |
| |
| public static final Parcelable.Creator<UserHandle> CREATOR |
| = new Parcelable.Creator<UserHandle>() { |
| public UserHandle createFromParcel(Parcel in) { |
| return new UserHandle(in); |
| } |
| |
| public UserHandle[] newArray(int size) { |
| return new UserHandle[size]; |
| } |
| }; |
| |
| /** |
| * Instantiate a new UserHandle from the data in a Parcel that was |
| * previously written with {@link #writeToParcel(Parcel, int)}. Note that you |
| * must not use this with data written by |
| * {@link #writeToParcel(UserHandle, Parcel)} since it is not possible |
| * to handle a null UserHandle here. |
| * |
| * @param in The Parcel containing the previously written UserHandle, |
| * positioned at the location in the buffer where it was written. |
| */ |
| public UserHandle(Parcel in) { |
| mHandle = in.readInt(); |
| } |
| } |