Android 6.0一个完整的native service

上一篇博客《Android 6.0 如何添加完整的系统服务(app-framework-kernel)》http://www.cnblogs.com/hackfun/p/7418902.html
介绍了如何添加一个系统服务，客户端和服务端都是基于JAVA实现的OpersysService。经过进一步的学习，我将
演示如何使用C++实现一个相同功能的系统服务hfnativeservice。为了兼容OpersysService，将保留Opersys-
Service服务端中的HAL和driver，供hfnativeservice使用，即OpersysService和hfnativeservice这两个Service
都是用相同的HAL和driver。其中，hfnativeservice增加了一个服务端死亡通知机制，即hfnative-service的服
务端进程被杀掉时，客户端会收到这个通知，并做相应的清理工作。

主要围绕以下几个步骤添加一个完整的C++系统服务：
(A) 添加HAL和Driver
(B) 添加服务接口，生成动态库
(C) 添加服务端
(D) 注册服务端
(E) 添加客户端
(F) 测试

(A) 添加HAL和Driver
这部分参考上一篇博客《Android 6.0 如何添加完整的系统服务(app-framework-kernel)》的

(A) 添加circular-char驱动
(B) 添加opersyshw_qemu HAL

(B) 添加服务接口，生成动态库
为了对外只提供服务端或客户端的接口，这里把客户端和服务端之间的通信实现细节放在一起，生成动态库so
文件，服务端和客户端在使用的时候，加载这个so就可以了。IHfNativeService.cpp对客户端和服务端提供了相同
的接口，并实现了proxy和native之间的Binder通信细节。HfNativeManager.cpp根据IHfNativeService.cpp提供的
接口，进一步封装，隐藏了客户端的是操作细节，如服务的获取，注册死亡通知等。

相关头文件：

frameworks/native/include/hfnative/HfNativeManager.h

 1 #ifndef ANDROID_HACKFUN_HACKFUN_NATIVE_SERVICE_H
 2 #define ANDROID_HACKFUN_HACKFUN_NATIVE_SERVICE_H
 3 
 4 #include <stdint.h>
 5 #include <sys/types.h>
 6 
 7 #include <binder/IBinder.h>
 8 
 9 #include <utils/RefBase.h>
10 #include <utils/Singleton.h>
11 #include <utils/threads.h>
12 #include <hfnative/IHfNativeService.h> 
13 
14 namespace android {
15 // ---------------------------------------------------------------------------
16 
17 class HfNativeManager : public Singleton<HfNativeManager>
18 {
19 public:
20     HfNativeManager();
21     ~HfNativeManager();
22     
23     int init_hfnative(void);
24     void deinit_hfnative(void);
25     int read_queue(char *buff, int len);
26     int write_queue(char *buff, int len);
27     int test_hfnative(int value);
28 
29     status_t assertState();
30     bool checkService() const;
31     void resetServiceStatus();
32 
33 private:
34     bool isDied;
35     // DeathRecipient interface
36     void hfNativeServiceDied();
37 
38     mutable sp<IHfNativeService> mHfNativeServer;
39     mutable sp<IBinder::DeathRecipient> mDeathObserver;
40 };
41 
42 }; // namespace android
43 
44 #endif // ANDROID_HACKFUN_HACKFUN_NATIVE_SERVICE_H

frameworks/native/include/hfnative/IHfNativeService.h

 1 #ifndef ANDROID_HACKFUN_HACKFUN_COMPOSER_CLIENT_H
 2 #define ANDROID_HACKFUN_HACKFUN_COMPOSER_CLIENT_H
 3 
 4 #include <stdint.h>
 5 #include <sys/types.h>
 6 
 7 #include <utils/Errors.h>
 8 #include <utils/RefBase.h>
 9 
10 #include <binder/IInterface.h>
11 
12 namespace android {
13 // ----------------------------------------------------------------------------
14 
15 class IHfNativeService : public IInterface
16 {
17 public:
18     DECLARE_META_INTERFACE(HfNativeService);
19 
20     virtual int init_native(void) = 0;
21     virtual void finalize_native(void) = 0;
22     virtual int read_native(char *Buff, int Len) = 0;
23     virtual int write_native(char *Buff, int Len) = 0;
24     virtual int test_native(int value) = 0;
25 };
26 
27 // ----------------------------------------------------------------------------
28 
29 class BnHfNativeService: public BnInterface<IHfNativeService> {
30 public:
31     virtual status_t onTransact(uint32_t code, const Parcel& data,
32             Parcel* reply, uint32_t flags = 0);
33 };
34 
35 // ----------------------------------------------------------------------------
36 
37 }; // namespace android
38 
39 #endif // ANDROID_HACKFUN_HACKFUN_COMPOSER_CLIENT_H

源文件：

frameworks/native/libs/hfnative/IHfNativeService.cpp

  1 #define LOG_TAG "HfNativeService"
  2 
  3 #include <stdio.h>
  4 #include <stdint.h>
  5 #include <malloc.h>
  6 #include <sys/types.h>
  7 
  8 #include <binder/Parcel.h>
  9 #include <binder/IMemory.h>
 10 #include <binder/IPCThreadState.h>
 11 #include <binder/IServiceManager.h>
 12 #include <hfnative/IHfNativeService.h>
 13 
 14 namespace android {
 15 
 16 enum {
 17     INIT_NATIVE = IBinder::FIRST_CALL_TRANSACTION,
 18     FINALIZE_NATIVE,
 19     READ_NATIVE,
 20     WRITE_NATIVE,
 21     TEST_NATIVE
 22 };
 23 
 24 class BpHfNativeService : public BpInterface<IHfNativeService>
 25 {
 26 public:
 27     BpHfNativeService(const sp<IBinder>& impl)
 28         : BpInterface<IHfNativeService>(impl)
 29     {
 30     }
 31 
 32     int init_native(void)
 33     {
 34         Parcel data, reply;
 35         
 36         data.writeInterfaceToken(IHfNativeService::getInterfaceDescriptor()); 
 37         remote()->transact(INIT_NATIVE, data, &reply);
 38 
 39         return (int)reply.readInt32();
 40     }
 41 
 42     void finalize_native(void)
 43     {
 44         Parcel data, reply;
 45 
 46         data.writeInterfaceToken(IHfNativeService::getInterfaceDescriptor());
 47         remote()->transact(FINALIZE_NATIVE, data, &reply);
 48     }
 49 
 50     int read_native(char *Buff, int Len)
 51     {
 52         Parcel data, reply;
 53 
 54         data.writeInterfaceToken(IHfNativeService::getInterfaceDescriptor());
 55         data.writeInt32(Len);
 56         remote()->transact(READ_NATIVE, data, &reply);
 57         reply.read((void *)Buff, (size_t)Len);
 58         return (int) reply.readInt32();
 59     }
 60 
 61 
 62     int write_native(char *Buff, int Len)
 63     {
 64         Parcel data, reply;
 65 
 66         data.writeInterfaceToken(IHfNativeService::getInterfaceDescriptor());
 67         data.writeInt32(Len);
 68         data.write((const void *)Buff, (size_t)Len);
 69         remote()->transact(WRITE_NATIVE, data, &reply);
 70         return (int) reply.readInt32();
 71     }
 72 
 73     int test_native(int value)
 74     {
 75         Parcel data, reply;
 76 
 77         data.writeInterfaceToken(IHfNativeService::getInterfaceDescriptor());
 78         data.writeInt32(value);
 79         remote()->transact(TEST_NATIVE, data, &reply);
 80         return (int) reply.readInt32();
 81     }
 82 };
 83 
 84 IMPLEMENT_META_INTERFACE(HfNativeService, "android.hfnative.HfNativeService");
 85 
 86 status_t BnHfNativeService::onTransact(
 87     uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
 88 {
 89     char *buff;
 90     int len, retval;
 91     status_t status;
 92 
 93     switch(code) {
 94         case INIT_NATIVE: 
 95             CHECK_INTERFACE(IHfNativeService, data, reply);
 96             retval = init_native();
 97             reply->writeInt32(retval); 
 98             return NO_ERROR;
 99 
100         case FINALIZE_NATIVE:
101             CHECK_INTERFACE(IHfNativeService, data, reply); 
102             finalize_native();
103             return NO_ERROR; 
104 
105         case READ_NATIVE: {
106             CHECK_INTERFACE(IHfNativeService, data, reply);
107             len = data.readInt32();
108             buff = (char *)malloc(len);
109             retval = read_native(buff, len);
110             reply->write((const void *)buff, (size_t)len);
111             free(buff);
112             reply->writeInt32(retval);
113             return NO_ERROR;
114         } break;
115 
116         case WRITE_NATIVE: {
117             CHECK_INTERFACE(IHfNativeService, data, reply);
118             len = data.readInt32(); 
119             buff = (char *)malloc(len);
120             status = data.read((void *)buff, (size_t)len);      
121             retval = write_native(buff, len);
122             free(buff);
123             reply->writeInt32(retval);
124             return NO_ERROR;
125         } break;
126 
127         case TEST_NATIVE:
128             CHECK_INTERFACE(IHfNativeService, data, reply);
129             retval = test_native(data.readInt32());
130             reply->writeInt32(retval);
131             return NO_ERROR;
132 
133         default:
134           return BBinder::onTransact(code, data, reply, flags);
135     }
136 }
137 
138 }; // namespace android

frameworks/native/libs/hfnative/HfNativeManager.cpp

  1 #define LOG_TAG "HfNative"
  2 
  3 #include <stdint.h>
  4 #include <sys/types.h>
  5 
  6 #include <utils/Errors.h>
  7 #include <utils/RefBase.h>
  8 #include <utils/Singleton.h>
  9 
 10 #include <binder/IBinder.h>
 11 #include <binder/IServiceManager.h>
 12 
 13 #include <hfnative/IHfNativeService.h>
 14 #include <hfnative/HfNativeManager.h>
 15 
 16 // ----------------------------------------------------------------------------
 17 namespace android {
 18 // ----------------------------------------------------------------------------
 19 
 20 HfNativeManager::HfNativeManager() : isDied(false)
 21 {
 22     
 23 }
 24 
 25 HfNativeManager::~HfNativeManager()
 26 {
 27 }
 28 
 29 void HfNativeManager::hfNativeServiceDied()
 30 {
 31     isDied = true;
 32     mHfNativeServer.clear();
 33 }
 34 
 35 status_t HfNativeManager::assertState() {
 36     if (mHfNativeServer == NULL) {
 37         // try for one second
 38         const String16 name("hfnativeservice");
 39         for (int i=0 ; i<4 ; i++) {
 40             status_t err = getService(name, &mHfNativeServer);
 41             if (err == NAME_NOT_FOUND) {
 42                 usleep(250000);
 43                 continue;
 44             }
 45             if (err != NO_ERROR) {
 46                 return err;
 47             }
 48             break;
 49         }
 50         
 51         init_hfnative();
 52         ALOGI("test hfnativeservice [%d]", test_hfnative(20));
 53 
 54 
 55         class DeathObserver : public IBinder::DeathRecipient {
 56             HfNativeManager& mHfNativeManager;
 57             virtual void binderDied(const wp<IBinder>& who) {
 58                 ALOGW("hfnativeservice died [%p]", who.unsafe_get());
 59                 mHfNativeManager.hfNativeServiceDied();
 60             }
 61         public:
 62             DeathObserver(HfNativeManager& mgr) : mHfNativeManager(mgr) { }
 63         };
 64 
 65         mDeathObserver = new DeathObserver(*const_cast<HfNativeManager *>(this));
 66         mHfNativeServer->asBinder(mHfNativeServer)->linkToDeath(mDeathObserver);
 67     }
 68 
 69     return NO_ERROR;
 70 }
 71 
 72 bool HfNativeManager::checkService() const 
 73 {
 74     return isDied? true:false;
 75 }
 76 
 77 void HfNativeManager::resetServiceStatus() 
 78 {
 79     isDied = false; 
 80 }
 81 
 82 
 83 int HfNativeManager::init_hfnative(void)
 84 {
 85     return mHfNativeServer->init_native(); 
 86 }
 87 
 88 void HfNativeManager::deinit_hfnative(void)
 89 {
 90     mHfNativeServer->finalize_native();
 91 }
 92 
 93 int HfNativeManager::read_queue(char *buff, int len)
 94 {
 95     return mHfNativeServer->read_native(buff,len);
 96 }
 97 
 98 int HfNativeManager::write_queue(char *buff, int len)
 99 {
100     return mHfNativeServer->write_native(buff,len);
101 }
102 
103 int HfNativeManager::test_hfnative(int value)
104 {
105     return mHfNativeServer->test_native(value);
106 }
107 // ----------------------------------------------------------------------------
108 }; // namespace android

frameworks/native/libs/hfnative/Android.mk

 1 LOCAL_PATH:= $(call my-dir)
 2 include $(CLEAR_VARS)
 3 
 4 LOCAL_SRC_FILES:= 
 5     IHfNativeService.cpp 
 6     HfNativeManager.cpp
 7 
 8 LOCAL_SHARED_LIBRARIES := 
 9     libbinder 
10     libcutils 
11     libutils 
12 
13 LOCAL_MODULE:= libhfnativemgriface
14 
15 #ifneq ($(filter generic%,$(TARGET_DEVICE)),)
16     # Emulator build
17 #    LOCAL_CFLAGS += -DUSE_FENCE_SYNC
18 #endif
19 
20 include $(BUILD_SHARED_LIBRARY)
21 
22 #ifeq (,$(ONE_SHOT_MAKEFILE))
23 #include $(call first-makefiles-under,$(LOCAL_PATH))
24 #endif

(C) 添加服务端

服务端说白了就是客户端的远程调用，如，客户端调用write_native()的时候，服务端的write_native()
也会被调用。为什么客户端不能直接调用服务端的write_native()，就是因为客户端和服务端分别处于不同的
进程中，进程间的通讯必须通过Binder、socket等机制进行传递。

frameworks/native/services/hfnativeservice/HfNativeService.h

 1 #ifndef ANDROID_HACKFUN_NATIVE_SERVICE_H
 2 #define ANDROID_HACKFUN_NATIVE_SERVICE_H
 3 
 4 #include <stdint.h>
 5 #include <sys/types.h>
 6 
 7 #include <cutils/compiler.h>
 8 
 9 #include <utils/Atomic.h>
10 #include <utils/Errors.h>
11 #include <utils/KeyedVector.h>
12 #include <utils/RefBase.h>
13 #include <utils/SortedVector.h>
14 #include <utils/threads.h>
15 
16 #include <binder/BinderService.h>
17 
18 #include <hfnative/IHfNativeService.h>
19 
20 namespace android {
21 
22 // ---------------------------------------------------------------------------
23 
24 // ---------------------------------------------------------------------------
25 class HfNativeService : public BinderService<HfNativeService>,
26                        public BnHfNativeService
27 {
28 public:
29     static char const* getServiceName() {
30         return "hfnativeservice";
31     }
32 
33     HfNativeService();
34 
35 private:
36     virtual int init_native(void);
37     virtual void finalize_native(void);
38     virtual int read_native(char *Buff, int Len);
39     virtual int write_native(char *Buff, int Len);
40     virtual int test_native(int value);
41 };
42 
43 // ---------------------------------------------------------------------------
44 }; // namespace android
45 
46 #endif // ANDROID_HACKFUN_NATIVE_SERVICE_H

frameworks/native/services/hfnativeservice/HfNativeService.cpp

  1 #include <stdint.h>
  2 #include <math.h>
  3 #include <sys/types.h>
  4 
  5 #include <utils/Errors.h>
  6 #include <utils/RefBase.h>
  7 #include <utils/Singleton.h>
  8 #include <utils/String16.h>
  9 
 10 #include <binder/BinderService.h>
 11 #include <binder/IServiceManager.h>
 12 
 13 #include <hfnative/IHfNativeService.h>
 14 
 15 #include "HfNativeService.h"
 16 
 17 #include <utils/misc.h>
 18 #include <hardware/hardware.h>
 19 #include <hardware/opersyshw.h> 
 20 
 21 #include <stdio.h>
 22 
 23 namespace android {
 24 // ---------------------------------------------------------------------------
 25 
 26 
 27 opersyshw_device_t* opersyshw_dev; 
 28 
 29 
 30 HfNativeService::HfNativeService()
 31 {
 32 }
 33 
 34 int HfNativeService::init_native(void)
 35 {
 36     int err;
 37     hw_module_t* module;
 38     opersyshw_device_t* dev = NULL;
 39     
 40     ALOGI("init_native()"); 
 41     
 42     err = hw_get_module(OPERSYSHW_HARDWARE_MODULE_ID, (hw_module_t const**)&module);
 43     if (err == 0) {
 44         if (module->methods->open(module, "", ((hw_device_t**) &dev)) != 0) {
 45             ALOGE("Can't open opersys module!!!");
 46             return 0;
 47         }
 48     } else {
 49         ALOGE("Can't get opersys module!!!"); 
 50         return 0;
 51     }
 52     
 53     opersyshw_dev = dev;
 54 
 55     return 0;
 56 }
 57 
 58 void HfNativeService::finalize_native(void)
 59 {
 60     opersyshw_device_t* dev = opersyshw_dev;
 61     
 62     ALOGI("finalize_native()");
 63 
 64     if (dev == NULL) {
 65         return;
 66     }
 67 
 68     dev->close();
 69 
 70     free(dev);
 71 }
 72 
 73 
 74 int HfNativeService::read_native(char *Buff, int Len)
 75 {
 76     opersyshw_device_t* dev = opersyshw_dev;
 77     char* real_byte_array = Buff;
 78     int length;
 79     
 80     ALOGI("read_native()");
 81 
 82     if (dev == NULL) {
 83         return 0;
 84     }
 85 
 86     length = dev->read((char*) real_byte_array, Len);
 87     
 88     ALOGI("read data from hal: %s", (char *)real_byte_array);
 89 
 90     return length;
 91 }
 92 
 93 int HfNativeService::write_native(char *Buff, int Len)
 94 {
 95     opersyshw_device_t* dev = opersyshw_dev;
 96     char* real_byte_array = Buff;
 97     int length;
 98 
 99     ALOGI("write_native()");
100 
101     if (dev == NULL) {
102         return 0;
103     }
104 
105     length = dev->write((char*) real_byte_array, Len);
106     
107     ALOGI("write data to hal: %s", (char *)real_byte_array);
108 
109     return length;
110 }
111 
112 int HfNativeService::test_native(int value)
113 {
114     opersyshw_device_t* dev = opersyshw_dev;
115 
116     if (dev == NULL) {
117         return 0;
118     }
119     
120     ALOGI("test_native()");
121 
122     return dev->test(value);
123 }
124 
125 // ---------------------------------------------------------------------------
126 }; // namespace android

frameworks/native/services/hfnativeservice/Android.mk

 1 LOCAL_PATH:= $(call my-dir)
 2 include $(CLEAR_VARS)
 3 
 4 LOCAL_SRC_FILES:= 
 5     HfNativeService.cpp 
 6 
 7 LOCAL_CFLAGS:= -DLOG_TAG="HfNativeService"
 8 
 9 LOCAL_C_INCLUDES += 
10     $(call include-path-for, libhardware)/hardware
11 
12 LOCAL_SHARED_LIBRARIES := 
13     libcutils 
14     libutils 
15     libbinder 
16     libhardware 
17     libhfnativemgriface
18 
19 LOCAL_MODULE:= libhfnativeservice
20 
21 include $(BUILD_SHARED_LIBRARY)

(D) 注册服务端
这里启动添加的的服务，使其运行于一个独立的进程中，等待客户端的请求。

frameworks/native/cmds/hfnative/main_hfnativeservice.cpp

 1 #include <binder/BinderService.h>
 2 #include <HfNativeService.h>
 3 #include <binder/IPCThreadState.h>
 4 #include <binder/ProcessState.h>
 5 #include <binder/IServiceManager.h>
 6 
 7 #include <hfnative/IHfNativeService.h>
 8 
 9 using namespace android;
10 
11 int main(int argc, char** argv) {
12 #if 1
13     HfNativeService::publishAndJoinThreadPool(true);
14     // Like the SurfaceFlinger, limit the number of binder threads to 4.
15     ProcessState::self()->setThreadPoolMaxThreadCount(4);
16 #else
17     
18     sp<ProcessState> proc(ProcessState::self());
19 
20     sp<IServiceManager> sm = defaultServiceManager();
21 
22     sm->addService(String16("hfnativeservice"), new HfNativeService());
23 
24     ProcessState::self()->startThreadPool();
25     ProcessState::self()->giveThreadPoolName();
26     IPCThreadState::self()->joinThreadPool();
27     ProcessState::self()->setThreadPoolMaxThreadCount(4);
28 #endif
29     return 0;
30 }

frameworks/native/cmds/hfnative/Android.mk

 1 LOCAL_PATH:= $(call my-dir)
 2 include $(CLEAR_VARS)
 3 
 4 LOCAL_SRC_FILES:= 
 5     main_hfnativeservice.cpp 
 6 
 7 LOCAL_SHARED_LIBRARIES := 
 8     libhfnativeservice 
 9     libbinder 
10     libutils
11 
12 LOCAL_C_INCLUDES := 
13     $(LOCAL_PATH)/../../services/hfnativeservice
14 
15 LOCAL_MODULE:= hfnativeservice
16 
17 include $(BUILD_EXECUTABLE)

(E) 添加客户端
用户可以根据客户端提供的接口直接使用，无需关心复杂的客户端和服务端的通信细节。使用HfNativeManager
提供的接口，就能实现远程调用。这里创建了一个独立的线程用于等待接收服务端的死亡通知。

frameworks/base/tests/Hfnative/main_hfnativeclient.cpp

 1 #define LOG_TAG "HfNativeClient"
 2 
 3 #include <fcntl.h>
 4 #include <sys/prctl.h>
 5 #include <sys/wait.h>
 6 #include <cutils/properties.h>
 7 #include <utils/Log.h>
 8 #include <unistd.h>
 9 #include <binder/IPCThreadState.h>
10 #include <binder/ProcessState.h>
11 
12 #include <hfnative/HfNativeManager.h>
13 
14 using namespace android;
15 
16 
17 class HfThread: public Thread {
18 public:
19     HfNativeManager *hfmgr;
20 
21     HfThread(void *ptr) {
22         this->hfmgr = (HfNativeManager *)ptr;
23     }
24 
25     bool threadLoop();
26 };
27 
28 bool HfThread::threadLoop()
29 {
30     if (hfmgr->checkService()) {
31         ALOGW("hfnativeservice Died, please do some clear!"); 
32         hfmgr->resetServiceStatus();
33     }
34     
35     usleep(250000);
36 
37     return true;
38 }
39 
40 int main(int argc, char **argv) 
41 {
42     const char *str = {"Hello, Android !"};
43     char buff[strlen(str)];
44 
45     HfNativeManager *hfmgr = new HfNativeManager();
46 
47     if (hfmgr->assertState() == NO_ERROR) {
48         hfmgr->write_queue(const_cast<char *>(str), strlen(str));
49         usleep(100000);
50         hfmgr->read_queue(buff, sizeof(buff));
51         ALOGI("Service returned: %s", buff);
52     }
53 
54     sp<HfThread> th = new HfThread((void *)hfmgr);
55     th->run();
56 
57     ProcessState::self()->startThreadPool();
58     IPCThreadState::self()->joinThreadPool();
59 
60     return 0;
61 }

frameworks/base/tests/Hfnative/Android.mk

 1 LOCAL_PATH:= $(call my-dir)
 2 include $(CLEAR_VARS)
 3 
 4 LOCAL_SRC_FILES:= 
 5     main_hfnativeclient.cpp 
 6 
 7 LOCAL_SHARED_LIBRARIES := 
 8     libhfnativemgriface 
 9     libbinder 
10     libutils  
11     libcutils
12 
13 LOCAL_C_INCLUDES := 
14     $(ANDROID_SOURCE)/frameworks/native/include/
15 
16 LOCAL_MODULE:= hfnativeclient
17 
18 include $(BUILD_EXECUTABLE)

(F) 测试

编译后生成对应文件：

out/target/product/<device>/.../system/lib/libhfnativemgriface.so
out/target/product/<device>/.../system/lib/libhfnativeservice.so
out/target/product/<device>/.../system/bin/hfnativeservice
out/target/product/<device>/.../system/bin/hfnativeclient

然后push到机器的相应目录
在机器根目录下，执行以下命令，并观察对应的输出打印（注意要先启动服务端进程）：

# cd system/bin
# hfnativeservice &
# service check hfnativeservice
Service hfnativeservice: found
# hfnativeclient &
# kill -9 pid

对应的输出打印：

......
01-01 13:53:55.148  2424  2424 I HfNativeService: init_native()

01-01 13:53:55.149  2424  2424 D opersyshw_qemu: OPERSYS HW has been initialized

01-01 13:53:55.150  2424  2427 I HfNativeService: test_native()

01-01 13:53:55.151  2434  2434 I HfNative: test hfnativeservice [20]

01-01 13:53:55.151  2424  2424 I HfNativeService: write_native()

01-01 13:53:55.151  2424  2424 D opersyshw_qemu: OPERSYS HW - write()for 16 bytes called

01-01 13:53:55.151  2424  2424 D opersyshw_qemu: write data to driver: Hello, Android !

01-01 13:53:55.151  2424  2424 I HfNativeService: write data to hal: Hello, Android !

01-01 13:53:55.252  2424  2427 I HfNativeService: read_native()

01-01 13:53:55.252  2424  2427 D opersyshw_qemu: OPERSYS HW - read()for 16 bytes called

01-01 13:53:55.252  2424  2427 D opersyshw_qemu: read data from driver: Hello, Android !

01-01 13:53:55.252  2424  2427 I HfNativeService: read data from hal: Hello, Android !

01-01 13:53:55.252  2434  2434 I HfNativeClient: Service returned: Hello, Android !
......
01-01 13:54:08.210  2434  2434 W HfNative: hfnativeservice died [0xb6cc90c0]

01-01 13:54:08.210   211   211 I ServiceManager: service 'hfnativeservice' died

01-01 13:54:08.269  2434  2437 W HfNativeClient: hfnativeservice Died, please do some clear!
......

相关阅读:
ExecutorService与Executors例子的简单剖析
 java中线程队列BlockingQueue的用法
 mysql常用语句
 dubbo+zookeeper例子
 大型网站架构系列：消息队列（二）
大型网站架构系列：分布式消息队列（一）
什么是Code Review(转)
Ehcache 整合Spring 使用页面、对象缓存
 java 多线程——quartz 定时调度的例子
 Dubbo与Zookeeper、SpringMVC整合和使用（负载均衡、容错）
原文地址：https://www.cnblogs.com/hackfun/p/7486847.html