android_util_MemoryIntArrayTest.cpp revision 74c9983e80d8224bbe1de7c37e8f6ac4a76df11d 
1/*
2 * Copyright (C) 2016 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 <atomic>
18#include <jni.h>
19#include <cutils/ashmem.h>
20#include <linux/ashmem.h>
21#include <sys/ioctl.h>
22#include <sys/mman.h>
23
24jint android_util_MemoryIntArrayTest_createAshmem(__attribute__((unused)) JNIEnv* env,
25        __attribute__((unused)) jobject clazz,
26        jstring name, jint size)
27{
28
29    if (name == NULL) {
30        return -1;
31    }
32
33    if (size < 0) {
34        return -1;
35    }
36
37    const char* nameStr = env->GetStringUTFChars(name, NULL);
38    const int ashmemSize = sizeof(std::atomic_int) * size;
39    int fd = ashmem_create_region(nameStr, ashmemSize);
40    env->ReleaseStringUTFChars(name, nameStr);
41
42    if (fd < 0) {
43        return -1;
44    }
45
46    int setProtResult = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE);
47    if (setProtResult < 0) {
48        return -1;
49    }
50
51    return fd;
52}
53
54void android_util_MemoryIntArrayTest_setAshmemSize(__attribute__((unused)) JNIEnv* env,
55        __attribute__((unused)) jobject clazz, jint fd, jint size)
56{
57    if (fd < 0) {
58        return;
59    }
60
61    if (size < 0) {
62        return;
63    }
64
65    ioctl(fd, ASHMEM_SET_SIZE, size);
66}
67