Add ProcessInfoService to activity manager.

- Adds a new AIDL interface for querying process
  information from activity manager.

Bug: 19186859
Change-Id: Ic08858f346d6b66e7bfc9da6faa2c6e38d9b2e82

4 files changed, 75 insertions, 1 deletions

diff --git a/Android.mk b/Android.mk
index 2a94f3a..d9e4455 100644
--- a/Android.mk
+++ b/Android.mk
@@ -199,6 +199,7 @@ LOCAL_SRC_FILES += \
 	core/java/android/os/INetworkActivityListener.aidl \
 	core/java/android/os/INetworkManagementService.aidl \
 	core/java/android/os/IPermissionController.aidl \
+	core/java/android/os/IProcessInfoService.aidl \
 	core/java/android/os/IPowerManager.aidl \
 	core/java/android/os/IRemoteCallback.aidl \
 	core/java/android/os/ISchedulingPolicyService.aidl \
diff --git a/core/java/android/app/ActivityManager.java b/core/java/android/app/ActivityManager.java
index 7a636db..c6ffef6 100644
--- a/core/java/android/app/ActivityManager.java
+++ b/core/java/android/app/ActivityManager.java
@@ -256,6 +256,9 @@ public class ActivityManager {
     /** @hide User operation call: given user id is the current user, can't be stopped. */
     public static final int USER_OP_IS_CURRENT = -2;
 
+    /** @hide Process does not exist. */
+    public static final int PROCESS_STATE_NONEXISTENT = -1;
+
     /** @hide Process is a persistent system process. */
     public static final int PROCESS_STATE_PERSISTENT = 0;
 
diff --git a/core/java/android/os/IProcessInfoService.aidl b/core/java/android/os/IProcessInfoService.aidl
new file mode 100644
index 0000000..c98daa2
--- /dev/null
+++ b/core/java/android/os/IProcessInfoService.aidl
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2015 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} */
+interface IProcessInfoService
+{
+    /**
+     * For each PID in the given input array, write the current process state
+     * for that process into the output array, or ActivityManager.PROCESS_STATE_NONEXISTENT
+     * to indicate that no process with the given PID exists.
+     */
+    void getProcessStatesFromPids(in int[] pids, out int[] states);
+}
+
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index ab1a1e8..7b75f83 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -169,6 +169,7 @@ import android.os.FileUtils;
 import android.os.Handler;
 import android.os.IBinder;
 import android.os.IPermissionController;
+import android.os.IProcessInfoService;
 import android.os.IRemoteCallback;
 import android.os.IUserManager;
 import android.os.Looper;
@@ -1918,6 +1919,7 @@ public final class ActivityManagerService extends ActivityManagerNative
                 ServiceManager.addService("cpuinfo", new CpuBinder(this));
             }
             ServiceManager.addService("permission", new PermissionController(this));
+            ServiceManager.addService("processinfo", new ProcessInfoService(this));
 
             ApplicationInfo info = mContext.getPackageManager().getApplicationInfo(
                     "android", STOCK_PM_FLAGS);
@@ -6805,7 +6807,46 @@ public final class ActivityManagerService extends ActivityManagerNative
             }
         }
     }
-    
+
+    // =========================================================
+    // PROCESS INFO
+    // =========================================================
+
+    static class ProcessInfoService extends IProcessInfoService.Stub {
+        final ActivityManagerService mActivityManagerService;
+        ProcessInfoService(ActivityManagerService activityManagerService) {
+            mActivityManagerService = activityManagerService;
+        }
+
+        @Override
+        public void getProcessStatesFromPids(/*in*/ int[] pids, /*out*/ int[] states) {
+            mActivityManagerService.getProcessStatesForPIDs(/*in*/ pids, /*out*/ states);
+        }
+    }
+
+    /**
+     * For each PID in the given input array, write the current process state
+     * for that process into the output array, or -1 to indicate that no
+     * process with the given PID exists.
+     */
+    public void getProcessStatesForPIDs(/*in*/ int[] pids, /*out*/ int[] states) {
+        if (pids == null) {
+            throw new NullPointerException("pids");
+        } else if (states == null) {
+            throw new NullPointerException("states");
+        } else if (pids.length != states.length) {
+            throw new IllegalArgumentException("input and output arrays have different lengths!");
+        }
+
+        synchronized (mPidsSelfLocked) {
+            for (int i = 0; i < pids.length; i++) {
+                ProcessRecord pr = mPidsSelfLocked.get(pids[i]);
+                states[i] = (pr == null) ? ActivityManager.PROCESS_STATE_NONEXISTENT :
+                        pr.curProcState;
+            }
+        }
+    }
+
     // =========================================================
     // PERMISSIONS
     // =========================================================