Attempt to connect to debug process more than once

The debugger would give up after only 100ms but on my system this
timeout isn't enough. The startup process is now modified to try 6
times every 50ms instead.

Fixes #1010.

lib/_debugger.js

@@ -1046,19 +1046,16 @@ Interface.prototype.trySpawn = function(cb) {
 
   this.pause();
 
-  setTimeout(function() {
-    process.stdout.write('connecting...');
-    var client = self.client = new Client();
-    client.connect(exports.port);
+  var client = self.client = new Client();
+  var connectionAttempts = 0;
 
-    client.once('ready', function() {
-      process.stdout.write('ok\r\n');
+  client.once('ready', function() {
+    process.stdout.write(' ok\r\n');
 
-      // since we did debug-brk, we're hitting a break point immediately
-      // continue before anything else.
-      client.reqContinue(function() {
-        if (cb) cb();
-      });
+    // since we did debug-brk, we're hitting a break point immediately
+    // continue before anything else.
+    client.reqContinue(function() {
+      if (cb) cb();
     });
 
     client.on('close', function() {
@@ -1067,17 +1064,37 @@ Interface.prototype.trySpawn = function(cb) {
       self.killChild();
       if (!self.quitting) self.term.prompt();
     });
+  });
 
-    client.on('unhandledResponse', function(res) {
-      console.log('\r\nunhandled res:');
-      console.log(res);
-      self.term.prompt();
-    });
+  client.on('unhandledResponse', function(res) {
+    console.log('\r\nunhandled res:');
+    console.log(res);
+    self.term.prompt();
+  });
 
-    client.on('break', function(res) {
-      self.handleBreak(res.body);
-    });
-  }, 100);
+  client.on('break', function(res) {
+    self.handleBreak(res.body);
+  });
+
+  client.on('error', connectError);
+  function connectError() {
+    // If it's failed to connect 4 times then don't catch the next error
+    if (connectionAttempts >= 4) {
+      client.removeListener('error', connectError);
+    }
+    setTimeout(attemptConnect, 50);
+  }
+
+  function attemptConnect() {
+    ++connectionAttempts;
+    process.stdout.write('.');
+    client.connect(exports.port);
+  }
+
+  setTimeout(function() {
+    process.stdout.write('connecting..');
+    attemptConnect();
+  }, 50);
 };
 
 

src/node.cc

@@ -2222,7 +2222,7 @@ static void EnableDebug(bool wait_connect) {
   assert(r);
 
   // Print out some information.
-  fprintf(stderr, "debugger listening on port %d\r\n", debug_port);
+  fprintf(stderr, "debugger listening on port %d", debug_port);
 }