1 /*
2  * Copyright (C) 2020 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 import java.nio.channels.FileChannel;
18 import java.nio.file.*;
19 import java.nio.Buffer;
20 import java.nio.MappedByteBuffer;
21 
22 public class Main {
main(String[] args)23     public static void main(String[] args) throws Exception {
24         System.loadLibrary(args[0]);
25 
26         FileChannel channel = FileChannel.open(Paths.get("/dev", "null"),
27                                                StandardOpenOption.READ);
28         MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, 0);
29         checkBufferCapacity(buffer, 0);
30     }
31 
checkBufferCapacity(Buffer buffer, int expectedCapacity)32     static native void checkBufferCapacity(Buffer buffer, int expectedCapacity);
33 }
34