sandboxed-api/sandboxed_api/sandbox2/util/strerror_test.cc
Christian Blichmann 441201884a Update license header with recommended best practices
PiperOrigin-RevId: 290250533
Change-Id: Ic34b253446463cf971a055b70a242df93a598ee3
2020-01-17 05:05:29 -08:00

82 lines
2.4 KiB
C++

// Copyright 2019 Google LLC
//
// 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 "sandboxed_api/sandbox2/util/strerror.h"
#include <atomic>
#include <cerrno>
#include <string>
#include <thread> // NOLINT(build/c++11)
#include <vector>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/strings/match.h"
using ::testing::Eq;
using ::testing::StrEq;
namespace sandbox2 {
namespace {
TEST(StrErrorTest, ValidErrorCode) {
errno = EAGAIN;
EXPECT_THAT(StrError(EINTR), StrEq(strerror(EINTR)));
EXPECT_THAT(errno, Eq(EAGAIN));
}
TEST(StrErrorTest, InvalidErrorCode) {
errno = EBUSY;
EXPECT_THAT(StrError(-1), StrEq("Unknown error -1"));
EXPECT_THAT(errno, Eq(EBUSY));
}
TEST(StrErrorTest, MultipleThreads) {
// In this test, we will start up 2 threads and have each one call StrError
// 1000 times, each time with a different errnum. We expect that
// StrError(errnum) will return a string equal to the one returned by
// strerror(errnum), if the code is known. Since strerror is known to be
// thread-hostile, collect all the expected strings up front.
constexpr int kNumCodes = 1000;
std::vector<std::string> expected_strings(kNumCodes);
for (int i = 0; i < kNumCodes; ++i) {
expected_strings[i] = strerror(i);
}
std::atomic<int> counter{0};
auto thread_fun = [&counter, &expected_strings]() {
for (int i = 0; i < kNumCodes; ++i) {
++counter;
std::string value = StrError(i);
if (!absl::StartsWith(value, "Unknown error ")) {
EXPECT_THAT(StrError(i), StrEq(expected_strings[i]));
}
}
};
constexpr int kNumThreads = 100;
std::vector<std::thread> threads;
for (int i = 0; i < kNumThreads; ++i) {
threads.push_back(std::thread(thread_fun));
}
for (auto& thread : threads) {
thread.join();
}
EXPECT_THAT(counter, Eq(kNumThreads * kNumCodes));
}
} // namespace
} // namespace sandbox2