Add default signal handler tests

Author: RReverser

test/test_core.py

@@ -10,6 +10,7 @@
 import random
 import re
 import shutil
+import signal
 import sys
 import time
 import unittest
@@ -6179,6 +6180,20 @@ def test_sigalrm(self):
   def test_signals(self):
     self.do_core_test(test_file('test_signals.c'))
 
+  @parameterized({
+    'sigint': (['sigint', signal.SIGINT, 128+signal.SIGINT, True]),
+    'sigtrap': (['sigtrap', signal.SIGTRAP, 7, False])
+  })
+  def test_sig_default(self, suffix, signal, exit_code, assert_identical):
+    self.do_run_from_file(
+      test_file('test_sig_default.c'),
+      test_file(f'test_sig_default_{suffix}.out'),
+      emcc_args=['-sEXIT_RUNTIME'],
+      args=[str(int(signal))],
+      assert_identical=assert_identical,
+      assert_returncode=exit_code
+    )
+
   @no_windows('https://github.com/emscripten-core/emscripten/issues/8882')
   @requires_node
   def test_unistd_access(self):

test/test_sig_default.c

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2023 The Emscripten Authors.  All rights reserved.
+ * Emscripten is available under two separate licenses, the MIT license and the
+ * University of Illinois/NCSA Open Source License.  Both these licenses can be
+ * found in the LICENSE file.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <assert.h>
+
+static void cleanExit() {
+  puts("3");
+}
+
+int main(int argc, char **argv) {
+  atexit(cleanExit);
+  puts("1");
+  raise(atoi(argv[1]));
+  puts("2");
+  return 0;
+}

test/test_sig_default_sigint.out

@@ -0,0 +1 @@
+1

test/test_sig_default_sigtrap.out

@@ -0,0 +1 @@
+RuntimeError: unreachable