child_process: new stdio API for .spawn() method

lib/child_process.js

@@ -25,17 +25,38 @@ var Process = process.binding('process_wrap').Process;
 var util = require('util');
 var constants; // if (!constants) constants = process.binding('constants');
 
-var Pipe;
+var handleWraps = {};
 
+function handleWrapGetter(name, callback) {
+  var cons;
 
-// constructors for lazy loading
-function createPipe(ipc) {
-  // Lazy load
-  if (!Pipe) {
-    Pipe = process.binding('pipe_wrap').Pipe;
+  Object.defineProperty(handleWraps, name, {
+    get: function() {
+      if (cons !== undefined) return cons;
+      return cons = callback();
     }
+  });
+}
+
+handleWrapGetter('Pipe', function() {
+  return process.binding('pipe_wrap').Pipe;
+});
+
+handleWrapGetter('TTY', function() {
+  return process.binding('tty_wrap').TTY;
+});
+
+handleWrapGetter('TCP', function() {
+  return process.binding('tcp_wrap').TCP;
+});
 
-  return new Pipe(ipc);
+handleWrapGetter('UDP', function() {
+  return process.binding('udp_wrap').UDP;
+});
+
+// constructors for lazy loading
+function createPipe(ipc) {
+  return new handleWraps.Pipe(ipc);
 }
 
 function createSocket(pipe, readable) {
@@ -414,39 +435,18 @@ exports.fork = function(modulePath /*, args, options*/) {
   execArgv = options.execArgv || process.execArgv;
   args = execArgv.concat([modulePath], args);
 
-  // Don't allow stdinStream and customFds since a stdin channel will be used
-  if (options.stdinStream) {
-    throw new Error('stdinStream not allowed for fork()');
-  }
-
-  if (options.customFds) {
-    throw new Error('customFds not allowed for fork()');
-  }
-
   // Leave stdin open for the IPC channel. stdout and stderr should be the
   // same as the parent's if silent isn't set.
-  options.customFds = (options.silent ? [-1, -1, -1] : [-1, 1, 2]);
-
-  // Just need to set this - child process won't actually use the fd.
-  // For backwards compat - this can be changed to 'NODE_CHANNEL' before v0.6.
-  options.env = util._extend({}, options.env || process.env);
-  options.env.NODE_CHANNEL_FD = 42;
-
-  // stdin is the IPC channel.
-  options.stdinStream = createPipe(true);
-
-  var child = spawn(process.execPath, args, options);
+  options.stdio = options.silent ? ['ipc', 'pipe', 'pipe'] : ['ipc', 1, 2];
 
-  setupChannel(child, options.stdinStream);
-
-  return child;
+  return spawn(process.execPath, args, options);
 };
 
 
-exports._forkChild = function() {
+exports._forkChild = function(fd) {
   // set process.send()
   var p = createPipe(true);
-  p.open(0);
+  p.open(fd);
   setupChannel(process, p);
 };
 
@@ -591,6 +591,11 @@ var spawn = exports.spawn = function(file, args, options) {
   }
 
   var child = new ChildProcess();
+  if (options && options.customFds && !options.stdio) {
+    options.stdio = options.customFds.map(function(fd) {
+      return fd === -1 ? 'pipe' : fd;
+    });
+  }
 
   child.spawn({
     file: file,
@@ -598,8 +603,7 @@ var spawn = exports.spawn = function(file, args, options) {
     cwd: options ? options.cwd : null,
     windowsVerbatimArguments: !!(options && options.windowsVerbatimArguments),
     envPairs: envPairs,
-    customFds: options ? options.customFds : null,
-    stdinStream: options ? options.stdinStream : null,
+    stdio: options ? options.stdio : null,
     uid: options ? options.uid : null,
     gid: options ? options.gid : null
   });
@@ -658,45 +662,110 @@ function ChildProcess() {
 util.inherits(ChildProcess, EventEmitter);
 
 
-function setStreamOption(name, index, options) {
-  // Skip if we already have options.stdinStream
-  if (options[name]) return;
+function getHandleWrapType(stream) {
+  if (stream instanceof handleWraps.Pipe) return 'pipe';
+  if (stream instanceof handleWraps.TTY) return 'tty';
+  if (stream instanceof handleWraps.TCP) return 'tcp';
+  if (stream instanceof handleWraps.UDP) return 'udp';
 
-  if (options.customFds &&
-      typeof options.customFds[index] == 'number' &&
-      options.customFds[index] !== -1) {
-    if (options.customFds[index] === index) {
-      options[name] = null;
-    } else {
-      throw new Error('customFds not yet supported');
-    }
-  } else {
-    options[name] = createPipe();
-  }
+  return false;
 }
 
 
 ChildProcess.prototype.spawn = function(options) {
-  var self = this;
+  var self = this,
+      ipc,
+      ipcFd,
+      // If no `stdio` option was given - use default
+      stdio = options.stdio || 'pipe';
+
+  // Replace shortcut with an array
+  if (typeof stdio === 'string') {
+    switch (stdio) {
+      case 'ignore': stdio = ['ignore', 'ignore', 'ignore']; break;
+      case 'pipe': stdio = ['pipe', 'pipe', 'pipe']; break;
+      case 'inherit': stdio = [0, 1, 2]; break;
+      default: throw new TypeError('Incorrect value of stdio option: ' + stdio);
+    }
+  } else if (!Array.isArray(stdio)) {
+    throw new TypeError('Incorrect value of stdio option: ' + stdio);
+  }
+
+  // At least 3 stdio will be created
+  if (stdio.length < 3) {
+    stdio = stdio.concat(new Array(3 - stdio.length));
+  }
+
+  // Translate stdio into C++-readable form
+  // (i.e. PipeWraps or fds)
+  stdio = stdio.reduce(function(acc, stdio, i) {
+    function cleanup() {
+      acc.filter(function(stdio) {
+        return stdio.type === 'pipe' || stdio.type === 'ipc';
+      }).forEach(function(stdio) {
+        stdio.handle.close();
+      });
+    }
 
-  setStreamOption('stdinStream', 0, options);
-  setStreamOption('stdoutStream', 1, options);
-  setStreamOption('stderrStream', 2, options);
+    // Defaults
+    if (stdio === undefined || stdio === null) {
+      stdio = i < 3 ? 'pipe' : 'ignore';
+    }
 
-  var r = this._handle.spawn(options);
+    if (stdio === 'ignore') {
+      acc.push({type: 'ignore'});
+    } else if (stdio === 'pipe' || typeof stdio === 'number' && stdio < 0) {
+      acc.push({type: 'pipe', handle: createPipe()});
+    } else if (stdio === 'ipc') {
+      if (ipc !== undefined) {
+        // Cleanup previously created pipes
+        cleanup();
+        throw Error('Child process can have only one IPC pipe');
+      }
 
-  if (r) {
-    if (options.stdinStream) {
-      options.stdinStream.close();
+      ipc = createPipe(true);
+      ipcFd = i;
+
+      acc.push({ type: 'pipe', handle: ipc });
+    } else if (typeof stdio === 'number' || typeof stdio.fd === 'number') {
+      acc.push({ type: 'fd', fd: stdio.fd || stdio });
+    } else if (getHandleWrapType(stdio) || getHandleWrapType(stdio.handle) ||
+               getHandleWrapType(stdio._handle)) {
+      var handle = getHandleWrapType(stdio) ?
+          stdio :
+          getHandleWrapType(stdio.handle) ? stdio.handle : stdio._handle;
+
+      acc.push({
+        type: 'wrap',
+        wrapType: getHandleWrapType(handle),
+        handle: handle
+      });
+    } else {
+      // Cleanup
+      cleanup();
+      throw new TypeError('Incorrect value for stdio stream: ' + stdio);
     }
 
-    if (options.stdoutStream) {
-      options.stdoutStream.close();
+    return acc;
+  }, []);
+
+  options.stdio = stdio;
+
+  if (ipc !== undefined) {
+    // Let child process know about opened IPC channel
+    options.envPairs = options.envPairs || [];
+    options.envPairs.push('NODE_CHANNEL_FD=' + ipcFd);
   }
 
-    if (options.stderrStream) {
-      options.stderrStream.close();
+  var r = this._handle.spawn(options);
+
+  if (r) {
+    // Close all opened fds on error
+    stdio.forEach(function(stdio) {
+      if (stdio.type === 'pipe') {
+        stdio.handle.close();
       }
+    });
 
     this._handle.close();
     this._handle = null;
@@ -705,25 +774,36 @@ ChildProcess.prototype.spawn = function(options) {
 
   this.pid = this._handle.pid;
 
-  if (options.stdinStream) {
-    this.stdin = createSocket(options.stdinStream, false);
-  }
+  stdio.forEach(function(stdio, i) {
+    if (stdio.type === 'ignore') return;
+
+    if (stdio.handle) {
+      // when i === 0 - we're dealing with stdin
+      // (which is the only one writable pipe)
+      stdio.socket = createSocket(stdio.handle, i > 0);
 
-  if (options.stdoutStream) {
-    this.stdout = createSocket(options.stdoutStream, true);
-    this._closesNeeded++;
-    this.stdout.on('close', function() {
+      if (i > 0) {
+        self._closesNeeded++;
+        stdio.socket.on('close', function() {
           maybeClose(self);
         });
       }
+    }
+  });
 
-  if (options.stderrStream) {
-    this.stderr = createSocket(options.stderrStream, true);
-    this._closesNeeded++;
-    this.stderr.on('close', function() {
-      maybeClose(self);
+  this.stdin = stdio.length >= 1 && stdio[0].socket !== undefined ?
+      stdio[0].socket : null;
+  this.stdout = stdio.length >= 2 && stdio[1].socket !== undefined ?
+      stdio[1].socket : null;
+  this.stderr = stdio.length >= 3 && stdio[2].socket !== undefined ?
+      stdio[2].socket : null;
+
+  this.stdio = stdio.map(function(stdio) {
+    return stdio.socket === undefined ? null : stdio.socket;
   });
-  }
+
+  // Add .send() method and start listening for IPC data
+  if (ipc !== undefined) setupChannel(this, ipc);
 
   return r;
 };

node.gyp

@@ -109,6 +109,9 @@
         'src/node_version.h',
         'src/ngx-queue.h',
         'src/pipe_wrap.h',
+        'src/tty_wrap.h',
+        'src/tcp_wrap.h',
+        'src/udp_wrap.h',
         'src/req_wrap.h',
         'src/slab_allocator.h',
         'src/stream_wrap.h',

src/node.js

@@ -482,7 +482,8 @@
     // If we were spawned with env NODE_CHANNEL_FD then load that up and
     // start parsing data from that stream.
     if (process.env.NODE_CHANNEL_FD) {
-      assert(parseInt(process.env.NODE_CHANNEL_FD) >= 0);
+      var fd = parseInt(process.env.NODE_CHANNEL_FD, 10);
+      assert(fd >= 0);
 
       // Make sure it's not accidentally inherited by child processes.
       delete process.env.NODE_CHANNEL_FD;
@@ -494,7 +495,7 @@
       // FIXME is this really necessary?
       process.binding('tcp_wrap');
 
-      cp._forkChild();
+      cp._forkChild(fd);
       assert(process.send);
     }
   }

src/process_wrap.cc

@@ -22,6 +22,10 @@
 #include "node.h"
 #include "handle_wrap.h"
 #include "pipe_wrap.h"
+#include "tty_wrap.h"
+#include "tcp_wrap.h"
+#include "udp_wrap.h"
+
 #include <string.h>
 #include <stdlib.h>
 
@@ -36,6 +40,7 @@ using v8::HandleScope;
 using v8::FunctionTemplate;
 using v8::String;
 using v8::Array;
+using v8::Number;
 using v8::Function;
 using v8::TryCatch;
 using v8::Context;
@@ -82,6 +87,56 @@ class ProcessWrap : public HandleWrap {
   ProcessWrap(Handle<Object> object) : HandleWrap(object, NULL) { }
   ~ProcessWrap() { }
 
+  static void ParseStdioOptions(Local<Object> js_options,
+                                uv_process_options_t* options) {
+    Local<Array> stdios = js_options
+        ->Get(String::NewSymbol("stdio")).As<Array>();
+    int len = stdios->Length();
+    options->stdio = new uv_stdio_container_t[len];
+    options->stdio_count = len;
+
+    for (int i = 0; i < len; i++) {
+      Local<Object> stdio = stdios
+          ->Get(Number::New(static_cast<double>(i))).As<Object>();
+      Local<Value> type = stdio->Get(String::NewSymbol("type"));
+
+      if (type->Equals(String::NewSymbol("ignore"))) {
+        options->stdio[i].flags = UV_IGNORE;
+      } else if (type->Equals(String::NewSymbol("pipe"))) {
+        options->stdio[i].flags = UV_CREATE_PIPE;
+        options->stdio[i].data.stream = reinterpret_cast<uv_stream_t*>(
+            PipeWrap::Unwrap(stdio
+                ->Get(String::NewSymbol("handle")).As<Object>())->UVHandle());
+      } else if (type->Equals(String::NewSymbol("wrap"))) {
+        uv_stream_t* stream = NULL;
+        Local<Value> wrapType = stdio->Get(String::NewSymbol("wrapType"));
+        if (wrapType->Equals(String::NewSymbol("pipe"))) {
+          stream = reinterpret_cast<uv_stream_t*>(PipeWrap::Unwrap(stdio
+              ->Get(String::NewSymbol("handle")).As<Object>())->UVHandle());
+        } else if (wrapType->Equals(String::NewSymbol("tty"))) {
+          stream = reinterpret_cast<uv_stream_t*>(TTYWrap::Unwrap(stdio
+              ->Get(String::NewSymbol("handle")).As<Object>())->UVHandle());
+        } else if (wrapType->Equals(String::NewSymbol("tcp"))) {
+          stream = reinterpret_cast<uv_stream_t*>(TCPWrap::Unwrap(stdio
+              ->Get(String::NewSymbol("handle")).As<Object>())->UVHandle());
+        } else if (wrapType->Equals(String::NewSymbol("udp"))) {
+          stream = reinterpret_cast<uv_stream_t*>(UDPWrap::Unwrap(stdio
+              ->Get(String::NewSymbol("handle")).As<Object>())->UVHandle());
+        }
+        assert(stream != NULL);
+
+        options->stdio[i].flags = UV_INHERIT_STREAM;
+        options->stdio[i].data.stream = stream;
+      } else {
+        int fd = static_cast<int>(
+            stdio->Get(String::NewSymbol("fd"))->IntegerValue());
+
+        options->stdio[i].flags = UV_INHERIT_FD;
+        options->stdio[i].data.fd = fd;
+      }
+    }
+  }
+
   static Handle<Value> Spawn(const Arguments& args) {
     HandleScope scope;
 
@@ -169,47 +224,8 @@ class ProcessWrap : public HandleWrap {
       options.env[envc] = NULL;
     }
 
-    uv_stdio_container_t stdio[3];
-    memset(stdio, 0, sizeof(stdio));
-
-    options.stdio = stdio;
-    options.stdio_count = 3;
-    options.stdio[0].flags = UV_IGNORE;
-    options.stdio[1].flags = UV_IGNORE;
-    options.stdio[2].flags = UV_IGNORE;
-
-    // options.stdin_stream
-    Local<Value> stdin_stream_v = js_options->Get(
-        String::NewSymbol("stdinStream"));
-    if (!stdin_stream_v.IsEmpty() && stdin_stream_v->IsObject()) {
-      PipeWrap* stdin_wrap = PipeWrap::Unwrap(stdin_stream_v->ToObject());
-      options.stdio[0].flags = static_cast<uv_stdio_flags>(
-          UV_CREATE_PIPE | UV_WRITABLE_PIPE);
-      options.stdio[0].data.stream = reinterpret_cast<uv_stream_t*>(
-          stdin_wrap->UVHandle());
-    }
-
-    // options.stdout_stream
-    Local<Value> stdout_stream_v = js_options->Get(
-        String::NewSymbol("stdoutStream"));
-    if (!stdout_stream_v.IsEmpty() && stdout_stream_v->IsObject()) {
-      PipeWrap* stdout_wrap = PipeWrap::Unwrap(stdout_stream_v->ToObject());
-      options.stdio[1].flags = static_cast<uv_stdio_flags>(
-          UV_CREATE_PIPE | UV_READABLE_PIPE);
-      options.stdio[1].data.stream = reinterpret_cast<uv_stream_t*>(
-          stdout_wrap->UVHandle());
-    }
-
-    // options.stderr_stream
-    Local<Value> stderr_stream_v = js_options->Get(
-        String::NewSymbol("stderrStream"));
-    if (!stderr_stream_v.IsEmpty() && stderr_stream_v->IsObject()) {
-      PipeWrap* stderr_wrap = PipeWrap::Unwrap(stderr_stream_v->ToObject());
-      options.stdio[2].flags = static_cast<uv_stdio_flags>(
-          UV_CREATE_PIPE | UV_READABLE_PIPE);
-      options.stdio[2].data.stream = reinterpret_cast<uv_stream_t*>(
-          stderr_wrap->UVHandle());
-    }
+    // options.stdio
+    ParseStdioOptions(js_options, &options);
 
     // options.windows_verbatim_arguments
     if (js_options->Get(String::NewSymbol("windowsVerbatimArguments"))->
@@ -238,6 +254,8 @@ class ProcessWrap : public HandleWrap {
       delete [] options.env;
     }
 
+    delete[] options.stdio;
+
     return scope.Close(Integer::New(r));
   }
 

src/tcp_wrap.cc

@@ -128,6 +128,18 @@ void TCPWrap::Initialize(Handle<Object> target) {
 }
 
 
+TCPWrap* TCPWrap::Unwrap(Local<Object> obj) {
+  assert(!obj.IsEmpty());
+  assert(obj->InternalFieldCount() > 0);
+  return static_cast<TCPWrap*>(obj->GetPointerFromInternalField(0));
+}
+
+
+uv_tcp_t* TCPWrap::UVHandle() {
+  return &handle_;
+}
+
+
 Handle<Value> TCPWrap::New(const Arguments& args) {
   // This constructor should not be exposed to public javascript.
   // Therefore we assert that we are not trying to call this as a

src/tcp_wrap.h

@@ -31,6 +31,8 @@ class TCPWrap : public StreamWrap {
   static TCPWrap* Unwrap(v8::Local<v8::Object> obj);
   static void Initialize(v8::Handle<v8::Object> target);
 
+  uv_tcp_t* UVHandle();
+
  private:
   TCPWrap(v8::Handle<v8::Object> object);
   ~TCPWrap();

src/tty_wrap.cc

@@ -24,6 +24,7 @@
 #include "req_wrap.h"
 #include "handle_wrap.h"
 #include "stream_wrap.h"
+#include "tty_wrap.h"
 
 namespace node {
 
@@ -42,9 +43,8 @@ using v8::Arguments;
 using v8::Integer;
 using v8::Undefined;
 
-class TTYWrap : StreamWrap {
- public:
-  static void Initialize(Handle<Object> target) {
+
+void TTYWrap::Initialize(Handle<Object> target) {
   StreamWrap::Initialize(target);
 
   HandleScope scope;
@@ -72,10 +72,22 @@ class TTYWrap : StreamWrap {
   NODE_SET_METHOD(target, "guessHandleType", GuessHandleType);
 
   target->Set(String::NewSymbol("TTY"), t->GetFunction());
-  }
+}
+
+
+TTYWrap* TTYWrap::Unwrap(Local<Object> obj) {
+  assert(!obj.IsEmpty());
+  assert(obj->InternalFieldCount() > 0);
+  return static_cast<TTYWrap*>(obj->GetPointerFromInternalField(0));
+}
+
 
- private:
-  static Handle<Value> GuessHandleType(const Arguments& args) {
+uv_tty_t* TTYWrap::UVHandle() {
+  return &handle_;
+}
+
+
+Handle<Value> TTYWrap::GuessHandleType(const Arguments& args) {
   HandleScope scope;
   int fd = args[0]->Int32Value();
   assert(fd >= 0);
@@ -96,16 +108,18 @@ class TTYWrap : StreamWrap {
       assert(0);
       return v8::Undefined();
   }
-  }
+}
 
-  static Handle<Value> IsTTY(const Arguments& args) {
+
+Handle<Value> TTYWrap::IsTTY(const Arguments& args) {
   HandleScope scope;
   int fd = args[0]->Int32Value();
   assert(fd >= 0);
   return uv_guess_handle(fd) == UV_TTY ? v8::True() : v8::False();
-  }
+}
 
-  static Handle<Value> GetWindowSize(const Arguments& args) {
+
+Handle<Value> TTYWrap::GetWindowSize(const Arguments& args) {
   HandleScope scope;
 
   UNWRAP(TTYWrap)
@@ -123,9 +137,10 @@ class TTYWrap : StreamWrap {
   a->Set(1, Integer::New(height));
 
   return scope.Close(a);
-  }
+}
+
 
-  static Handle<Value> SetRawMode(const Arguments& args) {
+Handle<Value> TTYWrap::SetRawMode(const Arguments& args) {
   HandleScope scope;
 
   UNWRAP(TTYWrap)
@@ -137,9 +152,10 @@ class TTYWrap : StreamWrap {
   }
 
   return scope.Close(Integer::New(r));
-  }
+}
+
 
-  static Handle<Value> New(const Arguments& args) {
+Handle<Value> TTYWrap::New(const Arguments& args) {
   HandleScope scope;
 
   // This constructor should not be exposed to public javascript.
@@ -155,15 +171,13 @@ class TTYWrap : StreamWrap {
   wrap->UpdateWriteQueueSize();
 
   return scope.Close(args.This());
-  }
+}
+
 
-  TTYWrap(Handle<Object> object, int fd, bool readable)
+TTYWrap::TTYWrap(Handle<Object> object, int fd, bool readable)
     : StreamWrap(object, (uv_stream_t*)&handle_) {
   uv_tty_init(uv_default_loop(), &handle_, fd, readable);
-  }
-
-  uv_tty_t handle_;
-};
+}
 
 }  // namespace node
 

src/tty_wrap.h

@@ -0,0 +1,58 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#ifndef TTY_WRAP_H_
+#define TTY_WRAP_H_
+
+#include "handle_wrap.h"
+#include "stream_wrap.h"
+
+namespace node {
+
+using v8::Object;
+using v8::Handle;
+using v8::Local;
+using v8::Value;
+using v8::Arguments;
+
+
+class TTYWrap : StreamWrap {
+ public:
+  static void Initialize(Handle<Object> target);
+  static TTYWrap* Unwrap(Local<Object> obj);
+
+  uv_tty_t* UVHandle();
+
+ private:
+  TTYWrap(Handle<Object> object, int fd, bool readable);
+
+  static Handle<Value> GuessHandleType(const Arguments& args);
+  static Handle<Value> IsTTY(const Arguments& args);
+  static Handle<Value> GetWindowSize(const Arguments& args);
+  static Handle<Value> SetRawMode(const Arguments& args);
+  static Handle<Value> New(const Arguments& args);
+
+  uv_tty_t handle_;
+};
+
+} // namespace node
+
+#endif // TTY_WRAP_H_

src/udp_wrap.cc

@@ -24,6 +24,7 @@
 #include "slab_allocator.h"
 #include "req_wrap.h"
 #include "handle_wrap.h"
+#include "udp_wrap.h"
 
 #include <stdlib.h>
 
@@ -60,45 +61,6 @@ static Persistent<String> onmessage_sym;
 static SlabAllocator slab_allocator(SLAB_SIZE);
 
 
-class UDPWrap: public HandleWrap {
-public:
-  static void Initialize(Handle<Object> target);
-  static Handle<Value> New(const Arguments& args);
-  static Handle<Value> Bind(const Arguments& args);
-  static Handle<Value> Send(const Arguments& args);
-  static Handle<Value> Bind6(const Arguments& args);
-  static Handle<Value> Send6(const Arguments& args);
-  static Handle<Value> RecvStart(const Arguments& args);
-  static Handle<Value> RecvStop(const Arguments& args);
-  static Handle<Value> GetSockName(const Arguments& args);
-  static Handle<Value> AddMembership(const Arguments& args);
-  static Handle<Value> DropMembership(const Arguments& args);
-  static Handle<Value> SetMulticastTTL(const Arguments& args);
-  static Handle<Value> SetMulticastLoopback(const Arguments& args);
-  static Handle<Value> SetBroadcast(const Arguments& args);
-  static Handle<Value> SetTTL(const Arguments& args);
-
-private:
-  UDPWrap(Handle<Object> object);
-  virtual ~UDPWrap();
-
-  static Handle<Value> DoBind(const Arguments& args, int family);
-  static Handle<Value> DoSend(const Arguments& args, int family);
-  static Handle<Value> SetMembership(const Arguments& args,
-                                     uv_membership membership);
-
-  static uv_buf_t OnAlloc(uv_handle_t* handle, size_t suggested_size);
-  static void OnSend(uv_udp_send_t* req, int status);
-  static void OnRecv(uv_udp_t* handle,
-                     ssize_t nread,
-                     uv_buf_t buf,
-                     struct sockaddr* addr,
-                     unsigned flags);
-
-  uv_udp_t handle_;
-};
-
-
 UDPWrap::UDPWrap(Handle<Object> object): HandleWrap(object,
                                                     (uv_handle_t*)&handle_) {
   int r = uv_udp_init(uv_default_loop(), &handle_);
@@ -426,6 +388,18 @@ void UDPWrap::OnRecv(uv_udp_t* handle,
 }
 
 
+UDPWrap* UDPWrap::Unwrap(Local<Object> obj) {
+  assert(!obj.IsEmpty());
+  assert(obj->InternalFieldCount() > 0);
+  return static_cast<UDPWrap*>(obj->GetPointerFromInternalField(0));
+}
+
+
+uv_udp_t* UDPWrap::UVHandle() {
+  return &handle_;
+}
+
+
 } // namespace node
 
 NODE_MODULE(node_udp_wrap, node::UDPWrap::Initialize)

src/udp_wrap.h

@@ -0,0 +1,60 @@
+#ifndef UDP_WRAP_H_
+#define UDP_WRAP_H_
+
+#include "node.h"
+#include "req_wrap.h"
+#include "handle_wrap.h"
+
+namespace node {
+
+using v8::Object;
+using v8::Handle;
+using v8::Local;
+using v8::Value;
+using v8::String;
+using v8::Arguments;
+
+class UDPWrap: public HandleWrap {
+ public:
+  static void Initialize(Handle<Object> target);
+  static Handle<Value> New(const Arguments& args);
+  static Handle<Value> Bind(const Arguments& args);
+  static Handle<Value> Send(const Arguments& args);
+  static Handle<Value> Bind6(const Arguments& args);
+  static Handle<Value> Send6(const Arguments& args);
+  static Handle<Value> RecvStart(const Arguments& args);
+  static Handle<Value> RecvStop(const Arguments& args);
+  static Handle<Value> GetSockName(const Arguments& args);
+  static Handle<Value> AddMembership(const Arguments& args);
+  static Handle<Value> DropMembership(const Arguments& args);
+  static Handle<Value> SetMulticastTTL(const Arguments& args);
+  static Handle<Value> SetMulticastLoopback(const Arguments& args);
+  static Handle<Value> SetBroadcast(const Arguments& args);
+  static Handle<Value> SetTTL(const Arguments& args);
+  static UDPWrap* Unwrap(Local<Object> obj);
+
+  uv_udp_t* UVHandle();
+
+ private:
+  UDPWrap(Handle<Object> object);
+  virtual ~UDPWrap();
+
+  static Handle<Value> DoBind(const Arguments& args, int family);
+  static Handle<Value> DoSend(const Arguments& args, int family);
+  static Handle<Value> SetMembership(const Arguments& args,
+                                     uv_membership membership);
+
+  static uv_buf_t OnAlloc(uv_handle_t* handle, size_t suggested_size);
+  static void OnSend(uv_udp_send_t* req, int status);
+  static void OnRecv(uv_udp_t* handle,
+                     ssize_t nread,
+                     uv_buf_t buf,
+                     struct sockaddr* addr,
+                     unsigned flags);
+
+  uv_udp_t handle_;
+};
+
+} // namespace node
+
+#endif // UDP_WRAP_H_

test/simple/test-process-wrap.js

@@ -58,7 +58,11 @@ pipe.onread = function(b, off, len) {
 p.spawn({
   file: process.execPath,
   args: [process.execPath, '-v'],
-  stdoutStream: pipe
+  stdio: [
+    { type: 'ignore' },
+    { type: 'pipe', handle: pipe },
+    { type: 'ignore' }
+  ]
 });