1 files changed, 40 insertions, 0 deletions
diff --git a/agent/src/main/native/com/code_intelligence/jazzer/runtime/signal_handler.cpp b/agent/src/main/native/com/code_intelligence/jazzer/runtime/signal_handler.cpp
new file mode 100644
index 00000000..2600a53a
--- /dev/null
+++ b/agent/src/main/native/com/code_intelligence/jazzer/runtime/signal_handler.cpp
@@ -0,0 +1,40 @@
+// 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 <jni.h>
+
+#include <atomic>
+#include <csignal>
+
+#include "com_code_intelligence_jazzer_runtime_SignalHandler.h"
+
+#ifdef _WIN32
+// Windows does not have SIGUSR1, which triggers a graceful exit of libFuzzer.
+// Instead, trigger a hard exit.
+#define SIGUSR1 SIGTERM
+#endif
+
+// Handles SIGINT raised while running Java code.
+[[maybe_unused]] void
+Java_com_code_1intelligence_jazzer_runtime_SignalHandler_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);
+  }
+}