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 #include <private/android_filesystem_config.h>
27
28 namespace android {
29
ProcessInfo()30 ProcessInfo::ProcessInfo() {}
31
getPriority(int pid,int * priority)32 bool ProcessInfo::getPriority(int pid, int* priority) {
33 sp<IBinder> binder = defaultServiceManager()->getService(String16("processinfo"));
34 sp<IProcessInfoService> service = interface_cast<IProcessInfoService>(binder);
35
36 size_t length = 1;
37 int32_t state;
38 static const int32_t INVALID_ADJ = -10000;
39 static const int32_t NATIVE_ADJ = -1000;
40 int32_t score = INVALID_ADJ;
41 status_t err = service->getProcessStatesAndOomScoresFromPids(length, &pid, &state, &score);
42 if (err != OK) {
43 ALOGE("getProcessStatesAndOomScoresFromPids failed");
44 return false;
45 }
46 ALOGV("pid %d state %d score %d", pid, state, score);
47 if (score <= NATIVE_ADJ) {
48 ALOGE("pid %d invalid OOM adjustments value %d", pid, score);
49 return false;
50 }
51
52 // Use OOM adjustments value as the priority. Lower the value, higher the priority.
53 *priority = score;
54 return true;
55 }
56
isValidPid(int pid)57 bool ProcessInfo::isValidPid(int pid) {
58 int callingPid = IPCThreadState::self()->getCallingPid();
59 int callingUid = IPCThreadState::self()->getCallingUid();
60 // Trust it if this is called from the same process otherwise pid has to match the calling pid.
61 return (callingPid == getpid()) || (callingPid == pid) || (callingUid == AID_MEDIA);
62 }
63
~ProcessInfo()64 ProcessInfo::~ProcessInfo() {}
65
66 } // namespace android
67