1 // Copyright 2021 Code Intelligence GmbH 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #include <jni.h> 16 17 #include <atomic> 18 #include <csignal> 19 20 #include "com_code_intelligence_jazzer_driver_SignalHandler.h" 21 22 #ifdef _WIN32 23 // Windows does not have SIGUSR1, which triggers a graceful exit of libFuzzer. 24 // Instead, trigger a hard exit. 25 #define SIGUSR1 SIGTERM 26 #endif 27 28 // Handles SIGINT raised while running Java code. 29 [[maybe_unused]] void Java_com_code_1intelligence_jazzer_driver_SignalHandler_handleInterrupt(JNIEnv *,jclass)30Java_com_code_1intelligence_jazzer_driver_SignalHandler_handleInterrupt( 31 JNIEnv *, jclass) { 32 static std::atomic<bool> already_exiting{false}; 33 if (!already_exiting.exchange(true)) { 34 // Let libFuzzer exit gracefully when the JVM received SIGINT. 35 raise(SIGUSR1); 36 } else { 37 // Exit libFuzzer forcefully on repeated SIGINTs. 38 raise(SIGTERM); 39 } 40 } 41