89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
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// Copyright 2020 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/base/internal/strerror.h"
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#include <atomic>
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#include <cerrno>
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#include <cstdio>
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#include <cstring>
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#include <string>
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#include <thread> // NOLINT(build/c++11)
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#include <vector>
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include "absl/strings/match.h"
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namespace {
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using ::testing::AnyOf;
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using ::testing::Eq;
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TEST(StrErrorTest, ValidErrorCode) {
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errno = ERANGE;
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EXPECT_THAT(absl::base_internal::StrError(EDOM), Eq(strerror(EDOM)));
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EXPECT_THAT(errno, Eq(ERANGE));
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}
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TEST(StrErrorTest, InvalidErrorCode) {
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errno = ERANGE;
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EXPECT_THAT(absl::base_internal::StrError(-1),
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AnyOf(Eq("No error information"), Eq("Unknown error -1")));
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EXPECT_THAT(errno, Eq(ERANGE));
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}
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TEST(StrErrorTest, MultipleThreads) {
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// In this test, we will start up 2 threads and have each one call
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// StrError 1000 times, each time with a different errnum. We
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// expect that StrError(errnum) will return a string equal to the
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// one returned by strerror(errnum), if the code is known. Since
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// strerror is known to be thread-hostile, collect all the expected
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// strings up front.
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const int kNumCodes = 1000;
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std::vector<std::string> expected_strings(kNumCodes);
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for (int i = 0; i < kNumCodes; ++i) {
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expected_strings[i] = strerror(i);
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}
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std::atomic_int counter(0);
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auto thread_fun = [&]() {
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for (int i = 0; i < kNumCodes; ++i) {
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++counter;
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errno = ERANGE;
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const std::string value = absl::base_internal::StrError(i);
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// EXPECT_* could change errno. Stash it first.
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int check_err = errno;
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EXPECT_THAT(check_err, Eq(ERANGE));
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// Only the GNU implementation is guaranteed to provide the
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// string "Unknown error nnn". POSIX doesn't say anything.
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if (!absl::StartsWith(value, "Unknown error ")) {
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EXPECT_THAT(value, Eq(expected_strings[i]));
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}
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}
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};
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const int kNumThreads = 100;
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std::vector<std::thread> threads;
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for (int i = 0; i < kNumThreads; ++i) {
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threads.push_back(std::thread(thread_fun));
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}
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for (auto& thread : threads) {
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thread.join();
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}
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EXPECT_THAT(counter, Eq(kNumThreads * kNumCodes));
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}
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} // namespace
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