blob: 016014ace8eaab97b5b3b2163f7f2913edd55390 [file] [log] [blame]
/*
* 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 "tracing/src/ipc/posix_shared_memory.h"
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#include "gtest/gtest.h"
#include "perfetto_base/build_config.h"
#include "perfetto_base/scoped_file.h"
#include "perfetto_base/test/test_task_runner.h"
#include "perfetto_base/utils.h"
namespace perfetto {
namespace {
const size_t kPageSize = 4096;
bool IsFileDescriptorClosed(int fd) {
return lseek(fd, 0, SEEK_CUR) == -1 && errno == EBADF;
}
bool IsMapped(void* start, size_t size) {
#if BUILDFLAG(OS_MACOSX)
using PageState = char;
#else
using PageState = unsigned char;
#endif
EXPECT_EQ(0u, size % kPageSize);
const size_t num_pages = size / kPageSize;
std::unique_ptr<PageState[]> page_states(new PageState[num_pages]);
memset(page_states.get(), 0, num_pages * sizeof(PageState));
int res = mincore(start, size, page_states.get());
// Linux returns ENOMEM when an unmapped memory range is passed.
// MacOS instead returns 0 but leaves the page_states empty.
if (res == -1 && errno == ENOMEM)
return false;
EXPECT_EQ(0, res);
for (size_t i = 0; i < num_pages; i++) {
if (!page_states[i])
return false;
}
return true;
}
TEST(PosixSharedMemoryTest, DestructorUnmapsMemory) {
PosixSharedMemory::Factory factory;
std::unique_ptr<SharedMemory> shm = factory.CreateSharedMemory(kPageSize);
void* const shm_start = shm->start();
const size_t shm_size = shm->size();
ASSERT_NE(nullptr, shm_start);
ASSERT_EQ(kPageSize, shm_size);
memcpy(shm_start, "test", 5);
ASSERT_TRUE(IsMapped(shm_start, shm_size));
shm.reset();
ASSERT_FALSE(IsMapped(shm_start, shm_size));
}
TEST(PosixSharedMemoryTest, DestructorClosesFD) {
std::unique_ptr<PosixSharedMemory> shm = PosixSharedMemory::Create(kPageSize);
int fd = shm->fd();
ASSERT_GE(fd, 0);
ASSERT_EQ(static_cast<off_t>(kPageSize), lseek(fd, 0, SEEK_END));
shm.reset();
ASSERT_TRUE(IsFileDescriptorClosed(fd));
}
TEST(PosixSharedMemoryTest, AttachToFd) {
FILE* tmp_file = tmpfile(); // Creates an unlinked auto-deleting temp file.
const int fd_num = fileno(tmp_file);
ASSERT_EQ(0, ftruncate(fd_num, kPageSize));
ASSERT_EQ(7, PERFETTO_EINTR(write(fd_num, "foobar", 7)));
std::unique_ptr<PosixSharedMemory> shm =
PosixSharedMemory::AttachToFd(base::ScopedFile(fd_num));
void* const shm_start = shm->start();
const size_t shm_size = shm->size();
ASSERT_NE(nullptr, shm_start);
ASSERT_EQ(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(IsMapped(shm_start, shm_size));
}
} // namespace
} // namespace perfetto