1 /*
2 * Copyright (C) 2024 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 <gtest/gtest.h>
18
19 #include <unistd.h>
20
21 #include <android-base/mapped_file.h>
22 #include <android-base/unique_fd.h>
23 #include <cutils/ashmem.h>
24
25 /*
26 * Tests in AshmemBaseTest are designed to run on Android as well as host
27 * platforms (Linux, Mac, Windows).
28 */
29
30 #if defined(_WIN32)
getpagesize()31 static inline size_t getpagesize() {
32 return 4096;
33 }
34 #endif
35
36 using android::base::unique_fd;
37
TEST(AshmemBaseTest,BasicTest)38 TEST(AshmemBaseTest, BasicTest) {
39 const size_t size = getpagesize();
40 std::vector<uint8_t> data(size);
41 std::generate(data.begin(), data.end(), [n = 0]() mutable { return n++ & 0xFF; });
42
43 unique_fd fd = unique_fd(ashmem_create_region(nullptr, size));
44 ASSERT_TRUE(fd >= 0);
45 ASSERT_TRUE(ashmem_valid(fd));
46 ASSERT_EQ(size, static_cast<size_t>(ashmem_get_size_region(fd)));
47
48 std::unique_ptr<android::base::MappedFile> mapped =
49 android::base::MappedFile::FromFd(fd, 0, size, PROT_READ | PROT_WRITE);
50 EXPECT_TRUE(mapped.get() != nullptr);
51 void* region1 = mapped->data();
52 EXPECT_TRUE(region1 != nullptr);
53
54 memcpy(region1, data.data(), size);
55 ASSERT_EQ(0, memcmp(region1, data.data(), size));
56
57 std::unique_ptr<android::base::MappedFile> mapped2 =
58 android::base::MappedFile::FromFd(fd, 0, size, PROT_READ | PROT_WRITE);
59 EXPECT_TRUE(mapped2.get() != nullptr);
60 void* region2 = mapped2->data();
61 EXPECT_TRUE(region2 != nullptr);
62 ASSERT_EQ(0, memcmp(region2, data.data(), size));
63 }
64