1 /*
2 * Copyright (C) 2017 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 "src/tracing/ipc/posix_shared_memory.h"
18
19 #include <errno.h>
20 #include <fcntl.h>
21 #include <stdio.h>
22 #include <string.h>
23 #include <sys/stat.h>
24 #include <unistd.h>
25
26 #include "gtest/gtest.h"
27 #include "perfetto/base/build_config.h"
28 #include "perfetto/base/scoped_file.h"
29 #include "perfetto/base/temp_file.h"
30 #include "perfetto/base/utils.h"
31 #include "src/base/test/test_task_runner.h"
32 #include "src/base/test/vm_test_utils.h"
33
34 namespace perfetto {
35 namespace {
36
IsFileDescriptorClosed(int fd)37 bool IsFileDescriptorClosed(int fd) {
38 return lseek(fd, 0, SEEK_CUR) == -1 && errno == EBADF;
39 }
40
TEST(PosixSharedMemoryTest,DestructorUnmapsMemory)41 TEST(PosixSharedMemoryTest, DestructorUnmapsMemory) {
42 PosixSharedMemory::Factory factory;
43 std::unique_ptr<SharedMemory> shm =
44 factory.CreateSharedMemory(base::kPageSize);
45 void* const shm_start = shm->start();
46 const size_t shm_size = shm->size();
47 ASSERT_NE(nullptr, shm_start);
48 ASSERT_EQ(base::kPageSize, shm_size);
49
50 memcpy(shm_start, "test", 5);
51 ASSERT_TRUE(base::vm_test_utils::IsMapped(shm_start, shm_size));
52
53 shm.reset();
54 ASSERT_FALSE(base::vm_test_utils::IsMapped(shm_start, shm_size));
55 }
56
TEST(PosixSharedMemoryTest,DestructorClosesFD)57 TEST(PosixSharedMemoryTest, DestructorClosesFD) {
58 std::unique_ptr<PosixSharedMemory> shm =
59 PosixSharedMemory::Create(base::kPageSize);
60 int fd = shm->fd();
61 ASSERT_GE(fd, 0);
62 ASSERT_EQ(static_cast<off_t>(base::kPageSize), lseek(fd, 0, SEEK_END));
63
64 shm.reset();
65 ASSERT_TRUE(IsFileDescriptorClosed(fd));
66 }
67
TEST(PosixSharedMemoryTest,AttachToFd)68 TEST(PosixSharedMemoryTest, AttachToFd) {
69 base::TempFile tmp_file = base::TempFile::CreateUnlinked();
70 const int fd_num = tmp_file.fd();
71 ASSERT_EQ(0, ftruncate(fd_num, base::kPageSize));
72 ASSERT_EQ(7, PERFETTO_EINTR(write(fd_num, "foobar", 7)));
73
74 std::unique_ptr<PosixSharedMemory> shm =
75 PosixSharedMemory::AttachToFd(tmp_file.ReleaseFD());
76 void* const shm_start = shm->start();
77 const size_t shm_size = shm->size();
78 ASSERT_NE(nullptr, shm_start);
79 ASSERT_EQ(base::kPageSize, shm_size);
80 ASSERT_EQ(0, memcmp("foobar", shm_start, 7));
81
82 ASSERT_FALSE(IsFileDescriptorClosed(fd_num));
83
84 shm.reset();
85 ASSERT_TRUE(IsFileDescriptorClosed(fd_num));
86 ASSERT_FALSE(base::vm_test_utils::IsMapped(shm_start, shm_size));
87 }
88
89 } // namespace
90 } // namespace perfetto
91