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