From a91b1409636db20e931e14e1be03261f57ab3f7c Mon Sep 17 00:00:00 2001
From: cloudhead <alexis@cloudhead.io>
Date: Mon, 21 Feb 2011 19:31:01 -0500
Subject: [PATCH] fix process.on edge case with signal event

When adding a listener for a signal event, removing it, and
adding it back again, it triggers a condition with an
undefined variable.
---
 src/node.js                        | 2 +-
 test/simple/test-signal-handler.js | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/node.js b/src/node.js
index 789cb9b0e1..6b0aa6f53e 100644
--- a/src/node.js
+++ b/src/node.js
@@ -232,7 +232,7 @@
           w.start();
 
         } else if (this.listeners(type).length === 1) {
-          signalWatchers[event].start();
+          signalWatchers[type].start();
         }
       }
 
diff --git a/test/simple/test-signal-handler.js b/test/simple/test-signal-handler.js
index 906573a3ae..9866fd6693 100644
--- a/test/simple/test-signal-handler.js
+++ b/test/simple/test-signal-handler.js
@@ -6,6 +6,8 @@ console.log('process.pid: ' + process.pid);
 var first = 0,
     second = 0;
 
+var sighup = false;
+
 process.addListener('SIGUSR1', function() {
   console.log('Interrupted by SIGUSR1');
   first += 1;
@@ -28,8 +30,15 @@ setInterval(function() {
   }
 }, 1);
 
+// Test addListener condition where a watcher for SIGNAL
+// has been previously registered, and `process.listeners(SIGNAL).length === 1`
+process.addListener('SIGHUP', function () {});
+process.removeAllListeners('SIGHUP');
+process.addListener('SIGHUP', function () { sighup = true });
+process.kill(process.pid, 'SIGHUP');
 
 process.addListener('exit', function() {
   assert.equal(1, first);
   assert.equal(1, second);
+  assert.equal(true, sighup);
 });