Updated SIGINT handler based on comment from mochajs#3570

Signed-off-by: jayasankar <jayasankar.m@gmail.com>

lib/cli/run-helpers.js

@@ -196,14 +196,19 @@ exports.singleRun = (mocha, {files = [], exit = false} = {}) => {
   mocha.files = files;
   const runner = mocha.run(exit ? exitMocha : exitMochaLater);
 
-  process.on('SIGINT', () => {
-    debug('aborting runner');
-    runner.abort();
+  process.on('SIGINT', function forceStop() {
+    if (forceStop.lock === undefined) {
+      forceStop.lock = true;
+      debug('aborting runner');
+      runner.abort();
 
-    // This is a hack:
-    // Instead of `process.exit(130)`, set runner.failures to 130 (exit code for SIGINT)
-    // The amount of failures will be emitted as error code later
-    runner.failures = 130;
+      // This is a hack:
+      // Instead of `process.exit(130)`, set runner.failures to 130 (exit code for SIGINT)
+      // The amount of failures will be emitted as error code later
+      runner.failures = 130;
+      // Reraising the signal
+      setImmediate(() => process.kill(process.pid, 'SIGINT'));
+    }
   });
 };