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// Copyright 2020 The Abseil Authors.
//
// 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
//
// https://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 "absl/base/internal/strerror.h"
#include <atomic>
#include <cerrno>
#include <cstdio>
#include <cstring>
#include <string>
#include <thread> // NOLINT(build/c++11)
#include <vector>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/strings/match.h"
namespace {
using ::testing::AnyOf;
using ::testing::Eq;
TEST(StrErrorTest, ValidErrorCode) {
errno = ERANGE;
EXPECT_THAT(absl::base_internal::StrError(EDOM), Eq(strerror(EDOM)));
EXPECT_THAT(errno, Eq(ERANGE));
}
TEST(StrErrorTest, InvalidErrorCode) {
errno = ERANGE;
EXPECT_THAT(absl::base_internal::StrError(-1),
AnyOf(Eq("No error information"), Eq("Unknown error -1")));
EXPECT_THAT(errno, Eq(ERANGE));
}
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.
const 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 = [&]() {
for (int i = 0; i < kNumCodes; ++i) {
++counter;
errno = ERANGE;
const std::string value = absl::base_internal::StrError(i);
// EXPECT_* could change errno. Stash it first.
int check_err = errno;
EXPECT_THAT(check_err, Eq(ERANGE));
// Only the GNU implementation is guaranteed to provide the
// string "Unknown error nnn". POSIX doesn't say anything.
if (!absl::StartsWith(value, "Unknown error ")) {
EXPECT_THAT(value, Eq(expected_strings[i]));
}
}
};
const 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
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