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      1 /*
      2  * Copyright 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ANDROID_PROCESS_INFO_SERVICE_H
     18 #define ANDROID_PROCESS_INFO_SERVICE_H
     19 
     20 #ifndef __ANDROID_VNDK__
     21 
     22 #include <binder/IProcessInfoService.h>
     23 #include <utils/Errors.h>
     24 #include <utils/Singleton.h>
     25 #include <sys/types.h>
     26 
     27 namespace android {
     28 
     29 // ----------------------------------------------------------------------
     30 
     31 class ProcessInfoService : public Singleton<ProcessInfoService> {
     32 
     33     friend class Singleton<ProcessInfoService>;
     34     sp<IProcessInfoService> mProcessInfoService;
     35     Mutex mProcessInfoLock;
     36 
     37     ProcessInfoService();
     38 
     39     status_t getProcessStatesImpl(size_t length, /*in*/ int32_t* pids, /*out*/ int32_t* states);
     40     status_t getProcessStatesScoresImpl(size_t length, /*in*/ int32_t* pids,
     41             /*out*/ int32_t* states, /*out*/ int32_t *scores);
     42     void updateBinderLocked();
     43 
     44     static const int BINDER_ATTEMPT_LIMIT = 5;
     45 
     46 public:
     47 
     48     /**
     49      * For each PID in the given "pids" input array, write the current process state
     50      * for that process into the "states" output array, or
     51      * ActivityManager.PROCESS_STATE_NONEXISTENT * to indicate that no process with the given PID
     52      * exists.
     53      *
     54      * Returns NO_ERROR if this operation was successful, or a negative error code otherwise.
     55      */
     56     static status_t getProcessStatesFromPids(size_t length, /*in*/ int32_t* pids,
     57             /*out*/ int32_t* states) {
     58         return ProcessInfoService::getInstance().getProcessStatesImpl(length, /*in*/ pids,
     59                 /*out*/ states);
     60     }
     61 
     62     /**
     63      * For each PID in the given "pids" input array, write the current process state
     64      * for that process into the "states" output array, or
     65      * ActivityManager.PROCESS_STATE_NONEXISTENT * to indicate that no process with the given PID
     66      * exists. OoM scores will also be written in the "scores" output array.
     67      * Please also note that clients calling this method need to have
     68      * "GET_PROCESS_STATE_AND_OOM_SCORE" permission.
     69      *
     70      * Returns NO_ERROR if this operation was successful, or a negative error code otherwise.
     71      */
     72     static status_t getProcessStatesScoresFromPids(size_t length, /*in*/ int32_t* pids,
     73             /*out*/ int32_t* states, /*out*/ int32_t *scores) {
     74         return ProcessInfoService::getInstance().getProcessStatesScoresImpl(
     75                 length, /*in*/ pids, /*out*/ states, /*out*/ scores);
     76     }
     77 };
     78 
     79 // ----------------------------------------------------------------------
     80 
     81 }; // namespace android
     82 
     83 #else // __ANDROID_VNDK__
     84 #error "This header is not visible to vendors"
     85 #endif // __ANDROID_VNDK__
     86 
     87 #endif // ANDROID_PROCESS_INFO_SERVICE_H
     88 
     89