JNI. H description

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * JNI specification, as defined by Sun:
 * http://java.sun.com/javase/6/docs/technotes/guides/jni/spec/jniTOC.html
 *
 * Everything here is expected to be VM-neutral.
 */

//  contrast 
// %ndk%/sysroot/usr/include/jni.h
// %sdk%/ndk/21.1.6352462/sysroot/usr/include/jni.h
// %ndk%/toolchains/llvm/prebuilt/darwin-x86_64/sysroot/usr/include/jni.h
// %sdk%/ndk/2