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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/named_system_lock/lock.h"
#include <memory>
#include <string>
#include "base/run_loop.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "base/test/bind.h"
#include "base/test/task_environment.h"
#include "base/time/time.h"
#include "base/unguessable_token.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
#if BUILDFLAG(IS_LINUX)
#include <fcntl.h>
#include <sys/mman.h>
#include "base/files/file.h"
#include "base/strings/strcat.h"
#elif BUILDFLAG(IS_MAC)
#include "base/strings/strcat.h"
#elif BUILDFLAG(IS_WIN)
#include <windows.h>
#include "base/strings/utf_string_conversions.h"
#include "base/win/atl.h"
#endif
namespace named_system_lock {
class NamedSystemLockTest : public ::testing::Test {
public:
~NamedSystemLockTest() override = default;
protected:
// Use a different lock name for each test to avoid failures due to concurrent
// runs or leaks.
const std::string lock_name_ = base::UnguessableToken::Create().ToString();
std::unique_ptr<ScopedLock> CreateLock() {
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_MAC)
return ScopedLock::Create(lock_name_, base::Seconds(0));
#else
CSecurityAttributes sa;
return ScopedLock::Create(base::ASCIIToWide(lock_name_), &sa,
base::Seconds(0));
#endif
}
};
TEST_F(NamedSystemLockTest, LockThenLockSameThread) {
std::unique_ptr<ScopedLock> lock = CreateLock();
EXPECT_TRUE(lock);
std::unique_ptr<ScopedLock> lock_again = CreateLock();
#if BUILDFLAG(IS_WIN)
EXPECT_TRUE(lock_again);
#else // BUILDFLAG(IS_WIN)
EXPECT_FALSE(lock_again);
#endif // BUILDFLAG(IS_WIN)
}
TEST_F(NamedSystemLockTest, LockThenTryLockInThreadFail) {
base::test::TaskEnvironment task_environment;
std::unique_ptr<ScopedLock> lock = CreateLock();
EXPECT_TRUE(lock);
base::RunLoop run_loop;
base::ThreadPool::PostTaskAndReply(
FROM_HERE, {base::MayBlock()},
base::BindLambdaForTesting([&] { EXPECT_FALSE(CreateLock()); }),
base::BindLambdaForTesting([&run_loop] { run_loop.Quit(); }));
run_loop.Run();
}
TEST_F(NamedSystemLockTest, TryLockInThreadSuccess) {
base::test::TaskEnvironment task_environment;
base::RunLoop run_loop;
base::ThreadPool::PostTaskAndReply(
FROM_HERE, {base::MayBlock()},
base::BindLambdaForTesting([&] { EXPECT_TRUE(CreateLock()); }),
base::BindLambdaForTesting([&run_loop] { run_loop.Quit(); }));
run_loop.Run();
EXPECT_TRUE(CreateLock());
}
#if BUILDFLAG(IS_LINUX)
TEST_F(NamedSystemLockTest, SharedMemoryWrongPermissions) {
// Create a shared memory region with overpermissive perms.
int shm_fd = shm_open(lock_name_.c_str(), O_RDWR | O_CREAT | O_EXCL,
S_IRWXU | S_IRWXG | S_IRWXO);
ASSERT_GE(shm_fd, 0);
EXPECT_FALSE(CreateLock());
close(shm_fd);
shm_unlink(lock_name_.c_str());
}
#endif // BUILDFLAG(IS_LINUX)
} // namespace named_system_lock
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