src: backport fix for SIGINT crash on FreeBSD

This is a backport of b64983d.

Original commit message:

  src: reset signal handler to SIG_DFL on FreeBSD

  FreeBSD has a nasty bug with SA_RESETHAND reseting the SA_SIGINFO,
  that is in turn set for a libthr wrapper. This leads to a crash.
  Work around the issue by manually setting SIG_DFL in the signal
  handler.

  Fix: #9326
  PR-URL: nodejs/node#1218
  Reviewed-By: Johan Bergström <bugs@bergstroem.nu>
  Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

Fixes #9326.

Reviewed-By: Trevor Norris <trev.norris@gmail.com>
PR-URL: #14184

src/node.cc

@@ -2785,6 +2785,13 @@ static void AtExit() {
 
 static void SignalExit(int signo) {
   uv_tty_reset_mode();
+#ifdef __FreeBSD__
+  // FreeBSD has a nasty bug, see RegisterSignalHandler for details
+  struct sigaction sa;
+  memset(&sa, 0, sizeof(sa));
+  sa.sa_handler = SIG_DFL;
+  CHECK_EQ(sigaction(signo, &sa, nullptr), 0);
+#endif
   raise(signo);
 }
 
@@ -3163,7 +3170,12 @@ static void RegisterSignalHandler(int signal,
   struct sigaction sa;
   memset(&sa, 0, sizeof(sa));
   sa.sa_handler = handler;
+#ifndef __FreeBSD__
+  // FreeBSD has a nasty bug with SA_RESETHAND reseting the SA_SIGINFO, that is
+  // in turn set for a libthr wrapper. This leads to a crash.
+  // Work around the issue by manually setting SIG_DFL in the signal handler
   sa.sa_flags = reset_handler ? SA_RESETHAND : 0;
+#endif
   sigfillset(&sa.sa_mask);
   CHECK_EQ(sigaction(signal, &sa, NULL), 0);
 }

test/simple/test-regress-GH-node-9326.js

@@ -0,0 +1,12 @@
+var assert = require('assert');
+var child_process = require('child_process');
+
+// NOTE: Was crashing on FreeBSD
+var cp = child_process.spawn(process.execPath, [
+  '-e',
+  'process.kill(process.pid, "SIGINT")'
+]);
+
+cp.on('exit', function(code) {
+  assert.notEqual(code, 0);
+});