LibCore: Add fd() and notifier() accessors to Core::Stream::LocalSocket

Userland/Libraries/LibCore/Stream.cpp

@@ -678,6 +678,13 @@ ErrorOr<Bytes> LocalSocket::read_without_waiting(Bytes buffer)
     return m_helper.read(buffer, MSG_DONTWAIT);
 }
 
+Optional<int> LocalSocket::fd() const
+{
+    if (!is_open())
+        return {};
+    return m_helper.fd();
+}
+
 ErrorOr<int> LocalSocket::release_fd()
 {
     if (!is_open()) {

Userland/Libraries/LibCore/Stream.h

@@ -468,6 +468,9 @@ public:
     /// already closed.
     ErrorOr<int> release_fd();
 
+    Optional<int> fd() const;
+    RefPtr<Core::Notifier> notifier() { return m_helper.notifier(); }
+
     virtual ~LocalSocket() { close(); }
 
 private: