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 <[email protected]> Reviewed-By: Ben Noordhuis <[email protected]>
nodejs · Mar 20, 2015 · b64983d · b64983d
1 parent 6fc5e95
commit b64983d
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diff --git a/src/node.cc b/src/node.cc
@@ -2877,6 +2877,13 @@ 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);
 }
 
@@ -3257,7 +3264,12 @@ 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, nullptr), 0);
 }

diff --git a/test/parallel/test-regress-GH-node-9326.js b/test/parallel/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);
+});