stream_wrap, udp_wrap: add read-only fd property

Expose the file descriptor as a read-only property on the internal
handle objects. Intended for debugging purposes, not part of the API
proper. The property is always null on Windows.

Fixes #4754.

1 files changed, 19 insertions, 9 deletions

diff --git a/src/pipe_wrap.cc b/src/pipe_wrap.cc
index 39897af6951..149c4f21269 100644
--- a/src/pipe_wrap.cc
+++ b/src/pipe_wrap.cc
@@ -28,20 +28,21 @@
 
 namespace node {
 
-using v8::Object;
+using v8::Arguments;
+using v8::Boolean;
+using v8::Context;
+using v8::Function;
+using v8::FunctionTemplate;
 using v8::Handle;
+using v8::HandleScope;
+using v8::Integer;
 using v8::Local;
+using v8::Object;
 using v8::Persistent;
-using v8::Value;
-using v8::HandleScope;
-using v8::FunctionTemplate;
+using v8::PropertyAttribute;
 using v8::String;
-using v8::Function;
 using v8::TryCatch;
-using v8::Context;
-using v8::Arguments;
-using v8::Integer;
-using v8::Boolean;
+using v8::Value;
 
 Persistent<Function> pipeConstructor;
 
@@ -82,6 +83,15 @@ void PipeWrap::Initialize(Handle<Object> target) {
 
   t->InstanceTemplate()->SetInternalFieldCount(1);
 
+  enum PropertyAttribute attributes =
+      static_cast<PropertyAttribute>(v8::ReadOnly | v8::DontDelete);
+  t->InstanceTemplate()->SetAccessor(String::New("fd"),
+                                     StreamWrap::GetFD,
+                                     NULL,
+                                     Handle<Value>(),
+                                     v8::DEFAULT,
+                                     attributes);
+
   NODE_SET_PROTOTYPE_METHOD(t, "close", HandleWrap::Close);
   NODE_SET_PROTOTYPE_METHOD(t, "unref", HandleWrap::Unref);
   NODE_SET_PROTOTYPE_METHOD(t, "ref", HandleWrap::Ref);