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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 = (typeof JNI_CreateJavaVM)dlsym(libart_dso, "JNI_CreateJavaVM");
     63     ALOGE_IF(!JNI_CreateJavaVM, "DdmConnection: %s", dlerror());
     64 
     65     jint (*registerNatives)(JNIEnv* env, jclass clazz);
     66     registerNatives = (typeof registerNatives)dlsym(libandroid_runtime_dso,
     67         "Java_com_android_internal_util_WithFramework_registerNatives");
     68     ALOGE_IF(!registerNatives, "DdmConnection: %s", dlerror());
     69 
     70     if (!JNI_CreateJavaVM || !registerNatives) {
     71         goto error;
     72     }
     73 
     74     if (JNI_CreateJavaVM(&vm, &env, &args) == 0) {
     75         jclass startClass;
     76         jmethodID startMeth;
     77 
     78         // register native code
     79         if (registerNatives(env, 0) == 0) {
     80             // set our name by calling DdmHandleAppName.setAppName()
     81             startClass = env->FindClass("android/ddm/DdmHandleAppName");
     82             if (startClass) {
     83                 startMeth = env->GetStaticMethodID(startClass,
     84                         "setAppName", "(Ljava/lang/String;I)V");
     85                 if (startMeth) {
     86                     jstring str = env->NewStringUTF(name);
     87                     env->CallStaticVoidMethod(startClass, startMeth, str, getuid());
     88                     env->DeleteLocalRef(str);
     89                 }
     90             }
     91 
     92             // initialize DDMS communication by calling
     93             // DdmRegister.registerHandlers()
     94             startClass = env->FindClass("android/ddm/DdmRegister");
     95             if (startClass) {
     96                 startMeth = env->GetStaticMethodID(startClass,
     97                         "registerHandlers", "()V");
     98                 if (startMeth) {
     99                     env->CallStaticVoidMethod(startClass, startMeth);
    100                 }
    101             }
    102         }
    103     }
    104     return;
    105 
    106 error:
    107     if (libandroid_runtime_dso) {
    108         dlclose(libandroid_runtime_dso);
    109     }
    110     if (libart_dso) {
    111         dlclose(libart_dso);
    112     }
    113 }
    114 
    115 }; // namespace android
    116