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      1 /*
      2  * Copyright (C) 2008 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 #define LOG_TAG "pmtestdual native.cpp"
     18 #include <android/log.h>
     19 
     20 #include <stdio.h>
     21 
     22 #include "jni.h"
     23 
     24 #define ALOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
     25 #define ALOGE(...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)
     26 
     27 static jint
     28 add(JNIEnv */* env */, jobject /* thiz */, jint a, jint b) {
     29 int result = a + b;
     30     ALOGI("%d + %d = %d", a, b, result);
     31     return result;
     32 }
     33 
     34 static const char *classPathName = "com/framework/shareduid/dual/Native";
     35 
     36 static const JNINativeMethod methods[] = {
     37   {"add", "(II)I", (void*)add },
     38 };
     39 
     40 /*
     41  * Register several native methods for one class.
     42  */
     43 static int registerNativeMethods(JNIEnv* env, const char* className,
     44     const JNINativeMethod* gMethods, int numMethods)
     45 {
     46     jclass clazz;
     47 
     48     clazz = env->FindClass(className);
     49     if (clazz == NULL) {
     50         ALOGE("Native registration unable to find class '%s'", className);
     51         return JNI_FALSE;
     52     }
     53     if (env->RegisterNatives(clazz, gMethods, numMethods) < 0) {
     54         ALOGE("RegisterNatives failed for '%s'", className);
     55         return JNI_FALSE;
     56     }
     57 
     58     return JNI_TRUE;
     59 }
     60 
     61 /*
     62  * Register native methods for all classes we know about.
     63  *
     64  * returns JNI_TRUE on success.
     65  */
     66 static int registerNatives(JNIEnv* env)
     67 {
     68   if (!registerNativeMethods(env, classPathName,
     69                  methods, sizeof(methods) / sizeof(methods[0]))) {
     70     return JNI_FALSE;
     71   }
     72 
     73   return JNI_TRUE;
     74 }
     75 
     76 
     77 // ----------------------------------------------------------------------------
     78 
     79 /*
     80  * This is called by the VM when the shared library is first loaded.
     81  */
     82 
     83 typedef union {
     84     JNIEnv* env;
     85     void* venv;
     86 } UnionJNIEnvToVoid;
     87 
     88 jint JNI_OnLoad(JavaVM* vm, void* /* reserved */)
     89 {
     90     UnionJNIEnvToVoid uenv;
     91     uenv.venv = NULL;
     92     jint result = -1;
     93     JNIEnv* env = NULL;
     94 
     95     ALOGI("JNI_OnLoad");
     96 
     97     if (vm->GetEnv(&uenv.venv, JNI_VERSION_1_4) != JNI_OK) {
     98         ALOGE("ERROR: GetEnv failed");
     99         goto bail;
    100     }
    101     env = uenv.env;
    102 
    103     if (registerNatives(env) != JNI_TRUE) {
    104         ALOGE("ERROR: registerNatives failed");
    105         goto bail;
    106     }
    107 
    108     result = JNI_VERSION_1_4;
    109 
    110 bail:
    111     return result;
    112 }
    113