1 /*
2  * Copyright 2019 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 "NdkJavaVMHelper"
18 
19 #include "NdkJavaVMHelperPriv.h"
20 #include <utils/Log.h>
21 
22 namespace android {
23 
24 // static
getJNIEnv()25 JNIEnv *NdkJavaVMHelper::getJNIEnv() {
26     JNIEnv *env;
27     jsize nVMs;
28     JavaVM *vm;
29 
30     int status = JNI_GetCreatedJavaVMs(&vm, 1, &nVMs);
31     if (status != JNI_OK || nVMs == 0 || vm == NULL) {
32         ALOGE("Failed to get JVM instance");
33         return NULL;
34     } else if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
35         ALOGE("Failed to get JNIEnv for JavaVM: %p", vm);
36         return NULL;
37     }
38 
39     return env;
40 }
41 
42 }  // namespace android