Add execFile() for Orlando

Undocumented for now, but basically like exec() with args.

lib/child_process.js

@@ -10,8 +10,15 @@ var spawn = exports.spawn = function (path, args, env) {
   return child;
 };
 
+exports.exec = function (command /*, options, callback */) {
+  if (arguments.length < 3) {
+    return exports.execFile("/bin/sh", ["-c", command], arguments[1]);
+  } else {
+    return exports.execFile("/bin/sh", ["-c", command], arguments[1], arguments[2]);
+  }
+};
 
-exports.exec = function (command /* , options, callback */) {
+exports.execFile = function (file, args /*, options, callback */) {
   var options = { encoding: 'utf8'
                 , timeout: 0
                 , maxBuffer: 200*1024
@@ -19,15 +26,16 @@ exports.exec = function (command /* , options, callback */) {
                 };
 
   var callback = arguments[arguments.length-1];
-  if (typeof arguments[1] == 'object') {
+
+  if (typeof arguments[2] == 'object') {
     var keys = Object.keys(options);
     for (var i = 0; i < keys.length; i++) {
       var k = keys[i];
-      if (arguments[1][k] !== undefined) options[k] = arguments[1][k];
+      if (arguments[2][k] !== undefined) options[k] = arguments[2][k];
     }
   }
 
-  var child = spawn("/bin/sh", ["-c", command]);
+  var child = spawn(file, args);
   var stdout = "";
   var stderr = "";
   var killed = false;