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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     void* libdvm_dso = dlopen("libdvm.so", RTLD_NOW);
     49     ALOGE_IF(!libdvm_dso, "DdmConnection: %s", dlerror());
     50 
     51     void* libandroid_runtime_dso = dlopen("libandroid_runtime.so", RTLD_NOW);
     52     ALOGE_IF(!libandroid_runtime_dso, "DdmConnection: %s", dlerror());
     53 
     54     if (!libdvm_dso || !libandroid_runtime_dso) {
     55         goto error;
     56     }
     57 
     58     jint (*JNI_CreateJavaVM)(JavaVM** p_vm, JNIEnv** p_env, void* vm_args);
     59     JNI_CreateJavaVM = (typeof JNI_CreateJavaVM)dlsym(libdvm_dso, "JNI_CreateJavaVM");
     60     ALOGE_IF(!JNI_CreateJavaVM, "DdmConnection: %s", dlerror());
     61 
     62     jint (*registerNatives)(JNIEnv* env, jclass clazz);
     63     registerNatives = (typeof registerNatives)dlsym(libandroid_runtime_dso,
     64         "Java_com_android_internal_util_WithFramework_registerNatives");
     65     ALOGE_IF(!registerNatives, "DdmConnection: %s", dlerror());
     66 
     67     if (!JNI_CreateJavaVM || !registerNatives) {
     68         goto error;
     69     }
     70 
     71     if (JNI_CreateJavaVM(&vm, &env, &args) == 0) {
     72         jclass startClass;
     73         jmethodID startMeth;
     74 
     75         // register native code
     76         if (registerNatives(env, 0) == 0) {
     77             // set our name by calling DdmHandleAppName.setAppName()
     78             startClass = env->FindClass("android/ddm/DdmHandleAppName");
     79             if (startClass) {
     80                 startMeth = env->GetStaticMethodID(startClass,
     81                         "setAppName", "(Ljava/lang/String;I)V");
     82                 if (startMeth) {
     83                     jstring str = env->NewStringUTF(name);
     84                     env->CallStaticVoidMethod(startClass, startMeth, str, getuid());
     85                     env->DeleteLocalRef(str);
     86                 }
     87             }
     88 
     89             // initialize DDMS communication by calling
     90             // DdmRegister.registerHandlers()
     91             startClass = env->FindClass("android/ddm/DdmRegister");
     92             if (startClass) {
     93                 startMeth = env->GetStaticMethodID(startClass,
     94                         "registerHandlers", "()V");
     95                 if (startMeth) {
     96                     env->CallStaticVoidMethod(startClass, startMeth);
     97                 }
     98             }
     99         }
    100     }
    101     return;
    102 
    103 error:
    104     if (libandroid_runtime_dso) {
    105         dlclose(libandroid_runtime_dso);
    106     }
    107     if (libdvm_dso) {
    108         dlclose(libdvm_dso);
    109     }
    110 }
    111 
    112 }; // namespace android
    113