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 
DdmConnection_start(const char * name)26 void DdmConnection_start(const char* name) {
27     ALOGI("DdmConnection_start");
28     DdmConnection::start(name);
29 }
30 
start(const char * name)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