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 #include <binder/ProcessInfoService.h>
18 #include <binder/IServiceManager.h>
19
20 #include <utils/Log.h>
21 #include <utils/String16.h>
22
23 namespace android {
24
ProcessInfoService()25 ProcessInfoService::ProcessInfoService() {
26 updateBinderLocked();
27 }
28
getProcessStatesImpl(size_t length,int32_t * pids,int32_t * states)29 status_t ProcessInfoService::getProcessStatesImpl(size_t length, /*in*/ int32_t* pids,
30 /*out*/ int32_t* states) {
31 status_t err = NO_ERROR;
32 sp<IProcessInfoService> pis;
33 mProcessInfoLock.lock();
34 pis = mProcessInfoService;
35 mProcessInfoLock.unlock();
36
37 for (int i = 0; i < BINDER_ATTEMPT_LIMIT; i++) {
38
39 if (pis != NULL) {
40 err = pis->getProcessStatesFromPids(length, /*in*/ pids, /*out*/ states);
41 if (err == NO_ERROR) return NO_ERROR; // success
42 if (IInterface::asBinder(pis)->isBinderAlive()) return err;
43 }
44 sleep(1);
45
46 mProcessInfoLock.lock();
47 if (pis == mProcessInfoService) {
48 updateBinderLocked();
49 }
50 pis = mProcessInfoService;
51 mProcessInfoLock.unlock();
52 }
53
54 ALOGW("%s: Could not retrieve process states from ProcessInfoService after %d retries.",
55 __FUNCTION__, BINDER_ATTEMPT_LIMIT);
56
57 return TIMED_OUT;
58 }
59
updateBinderLocked()60 void ProcessInfoService::updateBinderLocked() {
61 const sp<IServiceManager> sm(defaultServiceManager());
62 if (sm != NULL) {
63 const String16 name("processinfo");
64 mProcessInfoService = interface_cast<IProcessInfoService>(sm->checkService(name));
65 }
66 }
67
68 ANDROID_SINGLETON_STATIC_INSTANCE(ProcessInfoService);
69
70 }; // namespace android
71