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      1 /*
      2  * Copyright (C) 2017 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 DEBUG false  // STOPSHIP if true
     18 #include "Log.h"
     19 
     20 #include "StatsService.h"
     21 #include "logd/LogReader.h"
     22 #include "socket/StatsSocketListener.h"
     23 
     24 #include <binder/IInterface.h>
     25 #include <binder/IPCThreadState.h>
     26 #include <binder/IServiceManager.h>
     27 #include <binder/ProcessState.h>
     28 #include <binder/Status.h>
     29 #include <utils/Looper.h>
     30 #include <utils/StrongPointer.h>
     31 
     32 #include <stdio.h>
     33 #include <sys/stat.h>
     34 #include <sys/types.h>
     35 #include <unistd.h>
     36 
     37 using namespace android;
     38 using namespace android::os::statsd;
     39 
     40 const bool kUseLogd = false;
     41 const bool kUseStatsdSocket = true;
     42 
     43 /**
     44  * Thread function data.
     45  */
     46 struct log_reader_thread_data {
     47     sp<StatsService> service;
     48 };
     49 
     50 /**
     51  * Thread func for where the log reader runs.
     52  */
     53 static void* log_reader_thread_func(void* cookie) {
     54     log_reader_thread_data* data = static_cast<log_reader_thread_data*>(cookie);
     55     sp<LogReader> reader = new LogReader(data->service);
     56 
     57     // Run the read loop. Never returns.
     58     reader->Run();
     59 
     60     ALOGW("statsd LogReader.Run() is not supposed to return.");
     61 
     62     delete data;
     63     return NULL;
     64 }
     65 
     66 /**
     67  * Creates and starts the thread to own the LogReader.
     68  */
     69 static status_t start_log_reader_thread(const sp<StatsService>& service) {
     70     status_t err;
     71     pthread_attr_t attr;
     72     pthread_t thread;
     73 
     74     // Thread data.
     75     log_reader_thread_data* data = new log_reader_thread_data();
     76     data->service = service;
     77 
     78     // Create the thread
     79     err = pthread_attr_init(&attr);
     80     if (err != NO_ERROR) {
     81         return err;
     82     }
     83     // TODO: Do we need to tweak thread priority?
     84     err = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
     85     if (err != NO_ERROR) {
     86         pthread_attr_destroy(&attr);
     87         return err;
     88     }
     89     err = pthread_create(&thread, &attr, log_reader_thread_func, static_cast<void*>(data));
     90     if (err != NO_ERROR) {
     91         pthread_attr_destroy(&attr);
     92         return err;
     93     }
     94     pthread_attr_destroy(&attr);
     95 
     96     return NO_ERROR;
     97 }
     98 
     99 int main(int /*argc*/, char** /*argv*/) {
    100     // Set up the looper
    101     sp<Looper> looper(Looper::prepare(0 /* opts */));
    102 
    103     // Set up the binder
    104     sp<ProcessState> ps(ProcessState::self());
    105     ps->setThreadPoolMaxThreadCount(9);
    106     ps->startThreadPool();
    107     ps->giveThreadPoolName();
    108     IPCThreadState::self()->disableBackgroundScheduling(true);
    109 
    110     // Create the service
    111     sp<StatsService> service = new StatsService(looper);
    112     if (defaultServiceManager()->addService(String16("stats"), service) != 0) {
    113         ALOGE("Failed to add service");
    114         return -1;
    115     }
    116     service->sayHiToStatsCompanion();
    117 
    118     service->Startup();
    119 
    120     sp<StatsSocketListener> socketListener = new StatsSocketListener(service);
    121 
    122     if (kUseLogd) {
    123         ALOGI("using logd");
    124         // Start the log reader thread
    125         status_t err = start_log_reader_thread(service);
    126         if (err != NO_ERROR) {
    127             return 1;
    128         }
    129     }
    130 
    131     if (kUseStatsdSocket) {
    132         ALOGI("using statsd socket");
    133         // Backlog and /proc/sys/net/unix/max_dgram_qlen set to large value
    134         if (socketListener->startListener(600)) {
    135             exit(1);
    136         }
    137     }
    138 
    139     // Loop forever -- the reports run on this thread in a handler, and the
    140     // binder calls remain responsive in their pool of one thread.
    141     while (true) {
    142         looper->pollAll(-1 /* timeoutMillis */);
    143     }
    144     ALOGW("statsd escaped from its loop.");
    145 
    146     return 1;
    147 }
    148