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
android_util_MemoryIntArrayTest_createAshmem(JNIEnv * env,jobject clazz,jstring name,jint size)24 jint 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
android_util_MemoryIntArrayTest_setAshmemSize(JNIEnv * env,jobject clazz,jint fd,jint size)54 void 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