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 "socket/StatsSocketListener.h"
22 
23 #include <android/binder_interface_utils.h>
24 #include <android/binder_process.h>
25 #include <android/binder_manager.h>
26 #include <utils/Looper.h>
27 
28 #include <stdio.h>
29 #include <sys/stat.h>
30 #include <sys/types.h>
31 #include <unistd.h>
32 
33 using namespace android;
34 using namespace android::os::statsd;
35 using ::ndk::SharedRefBase;
36 using std::shared_ptr;
37 using std::make_shared;
38 
39 shared_ptr<StatsService> gStatsService = nullptr;
40 sp<StatsSocketListener> gSocketListener = nullptr;
41 
42 void signalHandler(int sig) {
43     if (sig == SIGPIPE) {
44         // ShellSubscriber uses SIGPIPE as a signal to detect the end of the
45         // client process. Don't prematurely exit(1) here. Instead, ignore the
46         // signal and allow the write call to return EPIPE.
47         ALOGI("statsd received SIGPIPE. Ignoring signal.");
48         return;
49     }
50 
51     if (gSocketListener != nullptr) gSocketListener->stopListener();
52     if (gStatsService != nullptr) gStatsService->Terminate();
53     ALOGW("statsd terminated on receiving signal %d.", sig);
54     exit(1);
55 }
56 
57 void registerSignalHandlers()
58 {
59     struct sigaction sa;
60     sigemptyset(&sa.sa_mask);
61     sa.sa_flags = 0;
62     sa.sa_handler = signalHandler;
63     sigaction(SIGPIPE, &sa, nullptr);
64     sigaction(SIGHUP, &sa, nullptr);
65     sigaction(SIGINT, &sa, nullptr);
66     sigaction(SIGQUIT, &sa, nullptr);
67     sigaction(SIGTERM, &sa, nullptr);
68 }
69 
70 int main(int /*argc*/, char** /*argv*/) {
71     // Set up the looper
72     sp<Looper> looper(Looper::prepare(0 /* opts */));
73 
74     // Set up the binder
75     ABinderProcess_setThreadPoolMaxThreadCount(9);
76     ABinderProcess_startThreadPool();
77 
78     std::shared_ptr<LogEventQueue> eventQueue =
79             std::make_shared<LogEventQueue>(4000 /*buffer limit. Buffer is NOT pre-allocated*/);
80 
81     // Create the service
82     gStatsService = SharedRefBase::make<StatsService>(looper, eventQueue);
83     // TODO(b/149582373): Set DUMP_FLAG_PROTO once libbinder_ndk supports
84     // setting dumpsys priorities.
85     binder_status_t status = AServiceManager_addService(gStatsService->asBinder().get(), "stats");
86     if (status != STATUS_OK) {
87         ALOGE("Failed to add service as AIDL service");
88         return -1;
89     }
90 
91     registerSignalHandlers();
92 
93     gStatsService->sayHiToStatsCompanion();
94 
95     gStatsService->Startup();
96 
97     gSocketListener = new StatsSocketListener(eventQueue);
98 
99     ALOGI("Statsd starts to listen to socket.");
100     // Backlog and /proc/sys/net/unix/max_dgram_qlen set to large value
101     if (gSocketListener->startListener(600)) {
102         exit(1);
103     }
104 
105     // Loop forever -- the reports run on this thread in a handler, and the
106     // binder calls remain responsive in their pool of one thread.
107     while (true) {
108         looper->pollAll(-1 /* timeoutMillis */);
109     }
110     ALOGW("statsd escaped from its loop.");
111 
112     return 1;
113 }
114