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#include <sys/types.h>
19#include <unistd.h>
20
21#include <log/log.h>
22
23#include "jni.h"
24#include "DdmConnection.h"
25
26namespace android {
27
28void DdmConnection_start(const char* name) {
29    ALOGI("DdmConnection_start");
30    DdmConnection::start(name);
31}
32
33void DdmConnection::start(const char* name) {
34    JavaVM* vm;
35    JNIEnv* env;
36
37    // start a VM
38    JavaVMInitArgs args;
39    JavaVMOption opt;
40
41    opt.optionString =
42        "-agentlib:jdwp=transport=dt_android_adb,suspend=n,server=y";
43
44    args.version = JNI_VERSION_1_4;
45    args.options = &opt;
46    args.nOptions = 1;
47    args.ignoreUnrecognized = JNI_FALSE;
48
49
50    // TODO: Should this just link against libnativehelper and use its
51    // JNI_CreateJavaVM wrapper that essential does this dlopen/dlsym
52    // work based on the current system default runtime?
53    void* libart_dso = dlopen("libart.so", RTLD_NOW);
54    ALOGE_IF(!libart_dso, "DdmConnection: %s", dlerror());
55
56    void* libandroid_runtime_dso = dlopen("libandroid_runtime.so", RTLD_NOW);
57    ALOGE_IF(!libandroid_runtime_dso, "DdmConnection: %s", dlerror());
58
59    if (!libart_dso || !libandroid_runtime_dso) {
60        goto error;
61    }
62
63    jint (*JNI_CreateJavaVM)(JavaVM** p_vm, JNIEnv** p_env, void* vm_args);
64    JNI_CreateJavaVM = reinterpret_cast<decltype(JNI_CreateJavaVM)>(
65            dlsym(libart_dso, "JNI_CreateJavaVM"));
66    ALOGE_IF(!JNI_CreateJavaVM, "DdmConnection: %s", dlerror());
67
68    jint (*registerNatives)(JNIEnv* env, jclass clazz);
69    registerNatives = reinterpret_cast<decltype(registerNatives)>(
70            dlsym(libandroid_runtime_dso,
71                "Java_com_android_internal_util_WithFramework_registerNatives"));
72    ALOGE_IF(!registerNatives, "DdmConnection: %s", dlerror());
73
74    if (!JNI_CreateJavaVM || !registerNatives) {
75        goto error;
76    }
77
78    if (JNI_CreateJavaVM(&vm, &env, &args) == 0) {
79        jclass startClass;
80        jmethodID startMeth;
81
82        // register native code
83        if (registerNatives(env, 0) == 0) {
84            // set our name by calling DdmHandleAppName.setAppName()
85            startClass = env->FindClass("android/ddm/DdmHandleAppName");
86            if (startClass) {
87                startMeth = env->GetStaticMethodID(startClass,
88                        "setAppName", "(Ljava/lang/String;I)V");
89                if (startMeth) {
90                    jstring str = env->NewStringUTF(name);
91                    env->CallStaticVoidMethod(startClass, startMeth, str, getuid());
92                    env->DeleteLocalRef(str);
93                }
94            }
95
96            // initialize DDMS communication by calling
97            // DdmRegister.registerHandlers()
98            startClass = env->FindClass("android/ddm/DdmRegister");
99            if (startClass) {
100                startMeth = env->GetStaticMethodID(startClass,
101                        "registerHandlers", "()V");
102                if (startMeth) {
103                    env->CallStaticVoidMethod(startClass, startMeth);
104                }
105            }
106        }
107    }
108    return;
109
110error:
111    if (libandroid_runtime_dso) {
112        dlclose(libandroid_runtime_dso);
113    }
114    if (libart_dso) {
115        dlclose(libart_dso);
116    }
117}
118
119}; // namespace android
120