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Commit bb9cce5a authored by Christopher Tate's avatar Christopher Tate Committed by Chris Tate
Browse files

Let SysUI set wake-from-idle alarms with impunity 

In an always-on display environment the device may go into doze, but
SysUI will still need to update the display on an ongoing basis.

Bug 36506772
Test: manual

Change-Id: I0b20ba7c352bac7c278f659f0e29496cc342d381
parent d4072d2b

packages/SystemUI/AndroidManifest.xml

+4 −0
Original line number Diff line number Diff line
@@ -24,6 +24,10 @@ 


    <protected-broadcast android:name="com.android.systemui.action.PLUGIN_CHANGED" />



    <!-- SysUI must be the one to define this permission; its name is

         referenced by the core OS. -->

    <permission android:name="android.permission.systemui.IDENTITY"

        android:protectionLevel="signature" />



    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

services/core/java/com/android/server/AlarmManagerService.java

+38 −0
Original line number Diff line number Diff line
@@ -31,7 +31,11 @@ import android.content.ContentResolver; 
import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.content.pm.ApplicationInfo;

import android.content.pm.PackageInfo;

import android.content.pm.PackageManager;

import android.content.pm.PackageManager.NameNotFoundException;

import android.content.pm.PermissionInfo;

import android.database.ContentObserver;

import android.net.Uri;

import android.os.Binder;
@@ -153,6 +157,20 @@ class AlarmManagerService extends SystemService { 
    long mAllowWhileIdleMinTime;

    int mNumTimeChanged;



    // Bookkeeping about the identity of the "System UI" package, determined at runtime.



    /**

     * This permission must be defined by the canonical System UI package,

     * with protection level "signature".

     */

    private static final String SYSTEM_UI_SELF_PERMISSION =

            "android.permission.systemui.IDENTITY";



    /**

     * At boot we use SYSTEM_UI_SELF_PERMISSION to look up the definer's uid.

     */

    int mSystemUiUid;



    /**

     * The current set of user whitelisted apps for device idle mode, meaning these are allowed

     * to freely schedule alarms.
@@ -960,6 +978,25 @@ class AlarmManagerService extends SystemService { 
            }

        }



        // Determine SysUI's uid

        final PackageManager packMan = getContext().getPackageManager();

        try {

            PermissionInfo sysUiPerm = packMan.getPermissionInfo(SYSTEM_UI_SELF_PERMISSION, 0);

            ApplicationInfo sysUi = packMan.getApplicationInfo(sysUiPerm.packageName, 0);

            if ((sysUi.privateFlags&ApplicationInfo.PRIVATE_FLAG_PRIVILEGED) != 0) {

                mSystemUiUid = sysUi.uid;

            } else {

                Slog.e(TAG, "SysUI permission " + SYSTEM_UI_SELF_PERMISSION

                        + " defined by non-privileged app " + sysUi.packageName

                        + " - ignoring");

            }

        } catch (NameNotFoundException e) {

        }



        if (mSystemUiUid <= 0) {

            Slog.wtf(TAG, "SysUI package not found!");

        }



        PowerManager pm = (PowerManager) getContext().getSystemService(Context.POWER_SERVICE);

        mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "*alarm*");
@@ -1328,6 +1365,7 @@ class AlarmManagerService extends SystemService { 
            // This means we will allow these alarms to go off as normal even while idle, with no

            // timing restrictions.

            } else if (workSource == null && (callingUid < Process.FIRST_APPLICATION_UID

                    || callingUid == mSystemUiUid

                    || Arrays.binarySearch(mDeviceIdleUserWhitelist,

                            UserHandle.getAppId(callingUid)) >= 0)) {

                flags |= AlarmManager.FLAG_ALLOW_WHILE_IDLE_UNRESTRICTED;