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      1 /*
      2  * Copyright (C) 2011 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 <dlfcn.h>
     18 
     19 #include <cutils/log.h>
     20 
     21 #include "jni.h"
     22 #include "DdmConnection.h"
     23 
     24 namespace android {
     25 
     26 void DdmConnection_start(const char* name) {
     27     ALOGI("DdmConnection_start");
     28     DdmConnection::start(name);
     29 }
     30 
     31 void DdmConnection::start(const char* name) {
     32     JavaVM* vm;
     33     JNIEnv* env;
     34 
     35     // start a VM
     36     JavaVMInitArgs args;
     37     JavaVMOption opt;
     38 
     39     opt.optionString =
     40         "-agentlib:jdwp=transport=dt_android_adb,suspend=n,server=y";
     41 
     42     args.version = JNI_VERSION_1_4;
     43     args.options = &opt;
     44     args.nOptions = 1;
     45     args.ignoreUnrecognized = JNI_FALSE;
     46 
     47 
     48     // TODO: Should this just link against libnativehelper and use its
     49     // JNI_CreateJavaVM wrapper that essential does this dlopen/dlsym
     50     // work based on the current system default runtime?
     51     void* libart_dso = dlopen("libart.so", RTLD_NOW);
     52     ALOGE_IF(!libart_dso, "DdmConnection: %s", dlerror());
     53 
     54     void* libandroid_runtime_dso = dlopen("libandroid_runtime.so", RTLD_NOW);
     55     ALOGE_IF(!libandroid_runtime_dso, "DdmConnection: %s", dlerror());
     56 
     57     if (!libart_dso || !libandroid_runtime_dso) {
     58         goto error;
     59     }
     60 
     61     jint (*JNI_CreateJavaVM)(JavaVM** p_vm, JNIEnv** p_env, void* vm_args);
     62     JNI_CreateJavaVM = reinterpret_cast<decltype(JNI_CreateJavaVM)>(
     63             dlsym(libart_dso, "JNI_CreateJavaVM"));
     64     ALOGE_IF(!JNI_CreateJavaVM, "DdmConnection: %s", dlerror());
     65 
     66     jint (*registerNatives)(JNIEnv* env, jclass clazz);
     67     registerNatives = reinterpret_cast<decltype(registerNatives)>(
     68             dlsym(libandroid_runtime_dso,
     69                 "Java_com_android_internal_util_WithFramework_registerNatives"));
     70     ALOGE_IF(!registerNatives, "DdmConnection: %s", dlerror());
     71 
     72     if (!JNI_CreateJavaVM || !registerNatives) {
     73         goto error;
     74     }
     75 
     76     if (JNI_CreateJavaVM(&vm, &env, &args) == 0) {
     77         jclass startClass;
     78         jmethodID startMeth;
     79 
     80         // register native code
     81         if (registerNatives(env, 0) == 0) {
     82             // set our name by calling DdmHandleAppName.setAppName()
     83             startClass = env->FindClass("android/ddm/DdmHandleAppName");
     84             if (startClass) {
     85                 startMeth = env->GetStaticMethodID(startClass,
     86                         "setAppName", "(Ljava/lang/String;I)V");
     87                 if (startMeth) {
     88                     jstring str = env->NewStringUTF(name);
     89                     env->CallStaticVoidMethod(startClass, startMeth, str, getuid());
     90                     env->DeleteLocalRef(str);
     91                 }
     92             }
     93 
     94             // initialize DDMS communication by calling
     95             // DdmRegister.registerHandlers()
     96             startClass = env->FindClass("android/ddm/DdmRegister");
     97             if (startClass) {
     98                 startMeth = env->GetStaticMethodID(startClass,
     99                         "registerHandlers", "()V");
    100                 if (startMeth) {
    101                     env->CallStaticVoidMethod(startClass, startMeth);
    102                 }
    103             }
    104         }
    105     }
    106     return;
    107 
    108 error:
    109     if (libandroid_runtime_dso) {
    110         dlclose(libandroid_runtime_dso);
    111     }
    112     if (libart_dso) {
    113         dlclose(libart_dso);
    114     }
    115 }
    116 
    117 }; // namespace android
    118