From aac63036968f9bf0e3dbb7928e70f9fca1b18481 Mon Sep 17 00:00:00 2001
From: Christopher Monsanto <chris@monsan.to>
Date: Sat, 13 Dec 2014 01:41:57 -0500
Subject: [PATCH] run _6to5-node using execvp() if available

---
 bin/6to5-node  | 27 +++++++++++++++++----------
 doc/caveats.md |  7 +++++++
 2 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/bin/6to5-node b/bin/6to5-node
index 2387551176..85311725a8 100755
--- a/bin/6to5-node
+++ b/bin/6to5-node
@@ -5,7 +5,6 @@
  * when found, before invoking the "real" _6to5-node(1) executable.
  */
 
-var spawn = require("child_process").spawn;
 var args  = ["--harmony", __dirname + "/_6to5-node"];
 
 process.argv.slice(2).forEach(function(arg){
@@ -49,13 +48,21 @@ process.argv.slice(2).forEach(function(arg){
   }
 });
 
-var proc = spawn(process.argv[0], args, { stdio: "inherit" });
-proc.on("exit", function (code, signal) {
-  process.on("exit", function () {
-    if (signal) {
-      process.kill(process.pid, signal);
-    } else {
-      process.exit(code);
-    }
+try {
+  var kexec = require("kexec");
+  kexec(process.argv[0], args);
+} catch(e) {
+  if (e.code !== "MODULE_NOT_FOUND") throw err;
+  
+  var child_process = require("child_process");
+  var proc = child_process.spawn(process.argv[0], args, { stdio: "inherit" });
+  proc.on("exit", function (code, signal) {
+    process.on("exit", function () {
+      if (signal) {
+        process.kill(process.pid, signal);
+      } else {
+        process.exit(code);
+      }
+    })
   });
-});
+}
diff --git a/doc/caveats.md b/doc/caveats.md
index 32049b2f98..269d114207 100644
--- a/doc/caveats.md
+++ b/doc/caveats.md
@@ -39,3 +39,10 @@ class Bar extends Foo {
   }
 }
 ```
+
+## 6to5-node
+
+It is necessary to manually install `kexec` package on Unix-like OSes for
+`6to5-node` to correctly handle signals.
+
+**It is not recommended to use `6to5-node` with a process manager (`supervisord`, `upstart`, `systemd`, ...) without first installing `kexec`!**