Use a thread status flag to indicate interrupt status instead of trying to raise from the signal handler

src/kuroko.c

@@ -522,7 +522,7 @@ _dbgQuit:
 
 static void handleSigint(int sigNum) {
 	if (krk_currentThread.frameCount) {
-		krk_runtimeError(vm.exceptions->keyboardInterrupt, "Keyboard interrupt.");
+		krk_currentThread.flags |= KRK_THREAD_SIGNALLED;
 	}
 
 	signal(sigNum, handleSigint);

src/vm.c

@@ -1800,6 +1800,11 @@ static KrkValue run() {
 		if (krk_currentThread.flags & KRK_THREAD_SINGLE_STEP) {
 			krk_debuggerHook(frame);
 		}
+
+		if (krk_currentThread.flags & KRK_THREAD_SIGNALLED) {
+			krk_runtimeError(vm.exceptions->keyboardInterrupt, "Keyboard interrupt.");
+			goto _finishException;
+		}
 #endif
 
 #ifdef ENABLE_WATCHDOG

src/vm.h

@@ -226,6 +226,7 @@ typedef struct KrkVM {
 #define KRK_THREAD_ENABLE_SCAN_TRACING (1 << 2)
 #define KRK_THREAD_HAS_EXCEPTION       (1 << 3)
 #define KRK_THREAD_SINGLE_STEP         (1 << 4)
+#define KRK_THREAD_SIGNALLED           (1 << 5)
 
 /* Global flags */
 #define KRK_GLOBAL_ENABLE_STRESS_GC    (1 << 8)