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//
// Copyright 2018 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
//
// 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 "absl/debugging/failure_signal_handler.h"
#include <csignal>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include "gtest/gtest.h"
#include "absl/base/internal/raw_logging.h"
#include "absl/debugging/stacktrace.h"
#include "absl/debugging/symbolize.h"
#include "absl/strings/match.h"
#include "absl/strings/str_cat.h"
namespace {
#if GTEST_HAS_DEATH_TEST
// For the parameterized death tests. GetParam() returns the signal number.
using FailureSignalHandlerDeathTest = ::testing::TestWithParam<int>;
// This function runs in a fork()ed process on most systems.
void InstallHandlerAndRaise(int signo) {
absl::InstallFailureSignalHandler(absl::FailureSignalHandlerOptions());
raise(signo);
}
TEST_P(FailureSignalHandlerDeathTest, AbslFailureSignal) {
const int signo = GetParam();
std::string exit_regex = absl::StrCat(
"\\*\\*\\* ", absl::debugging_internal::FailureSignalToString(signo),
" received at time=");
#ifndef _WIN32
EXPECT_EXIT(InstallHandlerAndRaise(signo), testing::KilledBySignal(signo),
exit_regex);
#else
// Windows doesn't have testing::KilledBySignal().
EXPECT_DEATH(InstallHandlerAndRaise(signo), exit_regex);
#endif
}
ABSL_CONST_INIT FILE* error_file = nullptr;
void WriteToErrorFile(const char* msg) {
if (msg != nullptr) {
ABSL_RAW_CHECK(fwrite(msg, strlen(msg), 1, error_file) == 1,
"fwrite() failed");
}
ABSL_RAW_CHECK(fflush(error_file) == 0, "fflush() failed");
}
std::string GetTmpDir() {
// TEST_TMPDIR is set by Bazel. Try the others when not running under Bazel.
static const char* const kTmpEnvVars[] = {"TEST_TMPDIR", "TMPDIR", "TEMP",
"TEMPDIR", "TMP"};
for (const char* const var : kTmpEnvVars) {
const char* tmp_dir = std::getenv(var);
if (tmp_dir != nullptr) {
return tmp_dir;
}
}
// Try something reasonable.
return "/tmp";
}
// This function runs in a fork()ed process on most systems.
void InstallHandlerWithWriteToFileAndRaise(const char* file, int signo) {
error_file = fopen(file, "w");
ABSL_RAW_CHECK(error_file != nullptr, "Failed create error_file");
absl::FailureSignalHandlerOptions options;
options.writerfn = WriteToErrorFile;
absl::InstallFailureSignalHandler(options);
raise(signo);
}
TEST_P(FailureSignalHandlerDeathTest, AbslFatalSignalsWithWriterFn) {
const int signo = GetParam();
std::string tmp_dir = GetTmpDir();
std::string file = absl::StrCat(tmp_dir, "/signo_", signo);
std::string exit_regex = absl::StrCat(
"\\*\\*\\* ", absl::debugging_internal::FailureSignalToString(signo),
" received at time=");
#ifndef _WIN32
EXPECT_EXIT(InstallHandlerWithWriteToFileAndRaise(file.c_str(), signo),
testing::KilledBySignal(signo), exit_regex);
#else
// Windows doesn't have testing::KilledBySignal().
EXPECT_DEATH(InstallHandlerWithWriteToFileAndRaise(file.c_str(), signo),
exit_regex);
#endif
// Open the file in this process and check its contents.
std::fstream error_output(file);
ASSERT_TRUE(error_output.is_open()) << file;
std::string error_line;
std::getline(error_output, error_line);
EXPECT_TRUE(absl::StartsWith(
error_line,
absl::StrCat("*** ",
absl::debugging_internal::FailureSignalToString(signo),
" received at ")));
if (absl::debugging_internal::StackTraceWorksForTest()) {
std::getline(error_output, error_line);
EXPECT_TRUE(absl::StartsWith(error_line, "PC: "));
}
}
constexpr int kFailureSignals[] = {
SIGSEGV, SIGILL, SIGFPE, SIGABRT, SIGTERM,
#ifndef _WIN32
SIGBUS, SIGTRAP,
#endif
};
INSTANTIATE_TEST_CASE_P(AbslDeathTest, FailureSignalHandlerDeathTest,
::testing::ValuesIn(kFailureSignals));
#endif // GTEST_HAS_DEATH_TEST
} // namespace
int main(int argc, char** argv) {
absl::InitializeSymbolizer(argv[0]);
testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
}
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