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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "src/tracing/ipc/posix_shared_memory.h"
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include "perfetto/base/build_config.h"
#include "perfetto/ext/base/file_utils.h"
#include "perfetto/ext/base/scoped_file.h"
#include "perfetto/ext/base/temp_file.h"
#include "perfetto/ext/base/utils.h"
#include "src/base/test/test_task_runner.h"
#include "src/base/test/vm_test_utils.h"
#include "test/gtest_and_gmock.h"
namespace perfetto {
namespace {
bool IsFileDescriptorClosed(int fd) {
return lseek(fd, 0, SEEK_CUR) == -1 && errno == EBADF;
}
TEST(PosixSharedMemoryTest, DestructorUnmapsMemory) {
PosixSharedMemory::Factory factory;
std::unique_ptr<SharedMemory> shm =
factory.CreateSharedMemory(base::kPageSize);
void* const shm_start = shm->start();
const size_t shm_size = shm->size();
ASSERT_NE(nullptr, shm_start);
ASSERT_EQ(base::kPageSize, shm_size);
memcpy(shm_start, "test", 5);
ASSERT_TRUE(base::vm_test_utils::IsMapped(shm_start, shm_size));
shm.reset();
ASSERT_FALSE(base::vm_test_utils::IsMapped(shm_start, shm_size));
}
TEST(PosixSharedMemoryTest, DestructorClosesFD) {
std::unique_ptr<PosixSharedMemory> shm =
PosixSharedMemory::Create(base::kPageSize);
int fd = shm->fd();
ASSERT_GE(fd, 0);
ASSERT_EQ(static_cast<off_t>(base::kPageSize), lseek(fd, 0, SEEK_END));
shm.reset();
ASSERT_TRUE(IsFileDescriptorClosed(fd));
}
TEST(PosixSharedMemoryTest, AttachToFd) {
base::TempFile tmp_file = base::TempFile::CreateUnlinked();
const int fd_num = tmp_file.fd();
ASSERT_EQ(0, ftruncate(fd_num, base::kPageSize));
ASSERT_EQ(7, base::WriteAll(fd_num, "foobar", 7));
std::unique_ptr<PosixSharedMemory> shm =
PosixSharedMemory::AttachToFd(tmp_file.ReleaseFD());
void* const shm_start = shm->start();
const size_t shm_size = shm->size();
ASSERT_NE(nullptr, shm_start);
ASSERT_EQ(base::kPageSize, shm_size);
ASSERT_EQ(0, memcmp("foobar", shm_start, 7));
ASSERT_FALSE(IsFileDescriptorClosed(fd_num));
shm.reset();
ASSERT_TRUE(IsFileDescriptorClosed(fd_num));
ASSERT_FALSE(base::vm_test_utils::IsMapped(shm_start, shm_size));
}
} // namespace
} // namespace perfetto
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