1 /*
2 * Copyright (C) 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 //#define LOG_NDEBUG 0
18 #define LOG_TAG "ProcessInfo"
19 #include <utils/Log.h>
20
21 #include <media/stagefright/ProcessInfo.h>
22
23 #include <binder/IPCThreadState.h>
24 #include <binder/IProcessInfoService.h>
25 #include <binder/IServiceManager.h>
26
27 namespace android {
28
ProcessInfo()29 ProcessInfo::ProcessInfo() {}
30
getPriority(int pid,int * priority)31 bool ProcessInfo::getPriority(int pid, int* priority) {
32 sp<IBinder> binder = defaultServiceManager()->getService(String16("processinfo"));
33 sp<IProcessInfoService> service = interface_cast<IProcessInfoService>(binder);
34
35 size_t length = 1;
36 int32_t state;
37 static const int32_t INVALID_ADJ = -10000;
38 static const int32_t NATIVE_ADJ = -1000;
39 int32_t score = INVALID_ADJ;
40 status_t err = service->getProcessStatesAndOomScoresFromPids(length, &pid, &state, &score);
41 if (err != OK) {
42 ALOGE("getProcessStatesAndOomScoresFromPids failed");
43 return false;
44 }
45 ALOGV("pid %d state %d score %d", pid, state, score);
46 if (score <= NATIVE_ADJ) {
47 ALOGE("pid %d invalid OOM adjustments value %d", pid, score);
48 return false;
49 }
50
51 // Use OOM adjustments value as the priority. Lower the value, higher the priority.
52 *priority = score;
53 return true;
54 }
55
isValidPid(int pid)56 bool ProcessInfo::isValidPid(int pid) {
57 int callingPid = IPCThreadState::self()->getCallingPid();
58 // Trust it if this is called from the same process otherwise pid has to match the calling pid.
59 return (callingPid == getpid()) || (callingPid == pid);
60 }
61
~ProcessInfo()62 ProcessInfo::~ProcessInfo() {}
63
64 } // namespace android
65