================
@@ -749,9 +752,30 @@ void request_attach(const llvm::json::Object &request) {
     // Disable async events so the attach will be successful when we return 
from
     // the launch call and the launch will happen synchronously
     g_dap.debugger.SetAsync(false);
-    if (core_file.empty())
-      g_dap.target.Attach(attach_info, error);
-    else
+    if (core_file.empty()) {
+      if ((pid != LLDB_INVALID_PROCESS_ID) && (port != invalid_port)) {
+        // If both pid and port numbers are specified.
+        error.SetErrorString("The user can't specify both pid and port");
+      } else if (port != invalid_port) {
+        // If port is specified and pid is not.
+        lldb::SBListener listener = g_dap.debugger.GetListener();
+
+        // If the user hasn't provided the hostname property, default localhost
+        // being used.
+        std::string connect_url("connect://localhost:");
+
+        // If the user has provided hostname other than localhost.
+        if (!hostname.empty() && !hostname.starts_with("localhost")) {
----------------
walter-erquinigo wrote:

wouldn't it just work with `localhost` being passed to `llvm::formatv`?

https://github.com/llvm/llvm-project/pull/91570
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