fixed #1

README.md

@@ -52,9 +52,19 @@ readlineSync.setPrompt(encoding)
 Set the encoding method of input (user's response) and output (`prompt`). Defaults to 'utf8'.
 
 ## Note
-The your Node and OS may not support interactively reading from stdin. The stdin interfaces are different by platforms.
+The your Node and OS may not support interactively reading from stdin. The stdin interfaces are different by platforms.  
+If in those platforms, an error is thrown.
+
+```js
+try {
+  answer = readlineSync.question('What is your favorite food? :');
+} catch (e) {
+  console.error(e);
+  process.exit(1);
+}
+```
 
 ## Release History
- * 2013-12-18			v0.2.1			Error handle for the environment which don't support interactively reading from stdin.
+ * 2013-12-18			v0.2.2			Error handle for the environment which don't support interactively reading from stdin.
  * 2013-08-30			v0.2.0			Rewrite exporting methods.
  * 2013-08-29			v0.1.0			Initial release.

lib/readline-sync.js

@@ -17,26 +17,28 @@ var promptText = '> ',
   buffer = new Buffer(BUF_SIZE);
 
 var _readlineSync = function(display) {
-  var input = '', rsize;
+  var input = '', rsize, err;
 
   if (display) { stdout.write(display, encoding); }
 
   stdin.resume();
   while (true) {
     rsize = 0;
+
     try {
       rsize = fs.readSync(stdin.fd, buffer, 0, BUF_SIZE);
     } catch (e) {
-      if (e.code === 'EAGAIN') {
+      if (e.code === 'EOF') { break; } // pipe
-        // Error: EAGAIN, resource temporarily unavailable
+      if (e.code === 'EAGAIN') { // EAGAIN, resource temporarily unavailable
-        if (display) { stdout.write('\n', encoding); } // Next of prompt line.
+        // util can't inherit Error.
-        console.error('Error: This machine don\'t support interactively reading from stdin.');
+        err = new Error('The platform don\'t support interactively reading from stdin');
-        process.exit(1);
+        err.errno = e.errno;
-      } else if (e.code === 'EOF') {
+        err.code = e.code;
-        break;
       }
-      throw e;
+      if (display) { stdout.write('\n', encoding); } // Return from prompt line.
+      throw err || e;
     }
+
     if (rsize === 0) { break; }
     input += buffer.toString(encoding, 0, rsize);
     if (/[\r\n]$/.test(input)) { break; }

package.json

@@ -1,7 +1,7 @@
 {
   "name": "readline-sync",
   "description": "Synchronous Readline",
-  "version": "0.2.1",
+  "version": "0.2.2",
   "homepage": "https://github.com/anseki/readline-sync",
   "author": {
     "name": "anseki"