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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
#include "mongo/platform/basic.h"
#include "mongo/unittest/death_test.h"
#ifndef _WIN32
#include <cstdio>
#include <sys/resource.h>
#include <sys/wait.h>
#include <unistd.h>
#endif
#if defined(__APPLE__)
#include <TargetConditionals.h>
#endif
#include <sstream>
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
#include "mongo/util/quick_exit.h"
#define checkSyscall(EXPR) \
do { \
if (-1 == (EXPR)) { \
const int err = errno; \
severe() << #EXPR " failed: " << errnoWithDescription(err); \
invariantFailed("-1 != (" #EXPR ")", __FILE__, __LINE__); \
} \
} while (false)
namespace mongo {
namespace unittest {
DeathTestImpl::DeathTestImpl(stdx::function<std::unique_ptr<Test>()> makeTest)
: _makeTest(std::move(makeTest)) {}
void DeathTestImpl::_doTest() {
#if defined(_WIN32)
log() << "Skipping death test on Windows";
return;
#elif defined(__APPLE__) && (TARGET_OS_TV || TARGET_OS_WATCH)
log() << "Skipping death test on tvOS/watchOS";
return;
#else
int pipes[2];
checkSyscall(pipe(pipes));
pid_t child;
checkSyscall(child = fork());
if (child) {
checkSyscall(close(pipes[1]));
char buf[1000];
std::ostringstream os;
ssize_t bytesRead;
while (0 < (bytesRead = read(pipes[0], buf, sizeof(buf)))) {
os.write(buf, bytesRead);
invariant(os);
}
checkSyscall(bytesRead);
pid_t pid;
int stat;
while (child != (pid = waitpid(child, &stat, 0))) {
invariant(pid == -1);
const int err = errno;
switch (err) {
case EINTR:
continue;
default:
severe() << "Unrecoverable error while waiting for " << child << ": "
<< errnoWithDescription(err);
MONGO_UNREACHABLE;
}
}
if (WIFSIGNALED(stat) || (WIFEXITED(stat) && WEXITSTATUS(stat) != 0)) {
// Exited with a signal or non-zero code. Should check the pattern, here,
// but haven't figured out how, so just return.
ASSERT_STRING_CONTAINS(os.str(), getPattern());
return;
} else {
invariant(!WIFSTOPPED(stat));
}
FAIL("Expected death, found life\n\n") << os.str();
}
// This code only executes in the child process.
checkSyscall(close(pipes[0]));
checkSyscall(dup2(pipes[1], 1));
checkSyscall(dup2(1, 2));
// We disable the creation of core dump files in the child process since the child process is
// expected to exit uncleanly. This avoids unnecessarily creating core dump files when the child
// process calls std::abort() or std::terminate().
const struct rlimit kNoCoreDump { 0U, 0U };
checkSyscall(setrlimit(RLIMIT_CORE, &kNoCoreDump));
try {
auto test = _makeTest();
test->run();
} catch (const TestAssertionFailureException& tafe) {
log() << "Caught test exception while expecting death: " << tafe;
// To fail the test, we must exit with a successful error code, because the parent process
// is checking for the child to die with an exit code indicating an error.
quickExit(EXIT_SUCCESS);
}
quickExit(EXIT_SUCCESS);
#endif
}
} // namespace unittest
} // namespace mongo
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