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// Copyright 2021 Code Intelligence GmbH
//
// 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 "signal_handler.h"
#include <jni.h>
#include <atomic>
#include <csignal>
#include <stdexcept>
constexpr auto kSignalHandlerClass =
"com/code_intelligence/jazzer/runtime/SignalHandler";
// Handles SIGINT raised while running Java code.
void JNICALL handleInterrupt(JNIEnv, jclass) {
static std::atomic<bool> already_exiting{false};
if (!already_exiting.exchange(true)) {
// Let libFuzzer exit gracefully when the JVM received SIGINT.
raise(SIGUSR1);
} else {
// Exit libFuzzer forcefully on repeated SIGINTs.
raise(SIGTERM);
}
}
namespace jazzer {
SignalHandler::SignalHandler(JVM &jvm)
: jvm_(jvm),
jclass_(jvm.FindClass(kSignalHandlerClass)),
setup_signal_handlers_method_(
jvm.GetStaticMethodID(jclass_, "setupSignalHandlers", "()V")) {}
void SignalHandler::SetupSignalHandlers() {
JNINativeMethod signal_handler[]{
{(char *)"handleInterrupt", (char *)"()V", (void *)&handleInterrupt},
};
jvm_.GetEnv().RegisterNatives(jclass_, signal_handler, 1);
if (jvm_.GetEnv().ExceptionCheck()) {
jvm_.GetEnv().ExceptionDescribe();
throw std::runtime_error(
"could not register native callbacks 'handleInterrupt'");
}
jvm_.GetEnv().CallStaticVoidMethod(jclass_, setup_signal_handlers_method_);
if (jvm_.GetEnv().ExceptionCheck()) {
jvm_.GetEnv().ExceptionDescribe();
throw std::runtime_error("failed to set up signal handlers");
}
}
} // namespace jazzer
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