dgram: implement socket.bind({ fd })

dgram: Implement binding an existing `fd`. Allow pass a `fd` property
to `socket.bind()` in dgram.
src: Add `UDPWrap::Open`

PR-URL: https://github.com/nodejs/node/pull/21745
Fixes: https://github.com/nodejs/node/issues/14961
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/udp_wrap.cc b/src/udp_wrap.cc
index 2ef5c61358..9bcf6ceb7b 100644
--- a/src/udp_wrap.cc
+++ b/src/udp_wrap.cc
@@ -117,6 +117,7 @@ void UDPWrap::Initialize(Local<Object> target,
                                               Local<FunctionTemplate>(),
                                               attributes);
 
+  env->SetProtoMethod(t, "open", Open);
   env->SetProtoMethod(t, "bind", Bind);
   env->SetProtoMethod(t, "send", Send);
   env->SetProtoMethod(t, "bind6", Bind6);
@@ -206,6 +207,18 @@ void UDPWrap::DoBind(const FunctionCallbackInfo<Value>& args, int family) {
 }
 
 
+void UDPWrap::Open(const FunctionCallbackInfo<Value>& args) {
+  UDPWrap* wrap;
+  ASSIGN_OR_RETURN_UNWRAP(&wrap,
+                          args.Holder(),
+                          args.GetReturnValue().Set(UV_EBADF));
+  int fd = static_cast<int>(args[0]->IntegerValue());
+  int err = uv_udp_open(&wrap->handle_, fd);
+
+  args.GetReturnValue().Set(err);
+}
+
+
 void UDPWrap::Bind(const FunctionCallbackInfo<Value>& args) {
   DoBind(args, AF_INET);
 }