From 4322f67fe2066cfc5c96397bbbf40cc40dbc8796 Mon Sep 17 00:00:00 2001
From: Mike Brady <4265913+mikebrady@users.noreply.github.com>
Date: Sun, 2 Jan 2022 10:06:36 +0000
Subject: [PATCH] Exit with a message in the log if the name to be used for the
 service is already in use.

---
 mdns_avahi.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/mdns_avahi.c b/mdns_avahi.c
index 7103b1ee..3dc58565 100644
--- a/mdns_avahi.c
+++ b/mdns_avahi.c
@@ -242,14 +242,21 @@ static void register_service(AvahiClient *c) {
     else
       selected_interface = AVAHI_IF_UNSPEC;
     if (ap2_text_record_string_list) {
-      ret = avahi_entry_group_add_service_strlst(group, selected_interface, AVAHI_PROTO_UNSPEC, 0,
+        ret = avahi_entry_group_add_service_strlst(group, selected_interface, AVAHI_PROTO_UNSPEC, 0,
                                                  ap2_service_name, config.regtype2, NULL, NULL,
                                                  port, ap2_text_record_string_list);
+        if (ret == AVAHI_ERR_COLLISION) {
+          die("Error: AirPlay 2 name \"%s\" is already in use.", ap2_service_name);
+        }
+        
     }
     if ((ret == 0) && (text_record_string_list)) {
       ret = avahi_entry_group_add_service_strlst(group, selected_interface, AVAHI_PROTO_UNSPEC, 0,
                                                  service_name, config.regtype, NULL, NULL, port,
                                                  text_record_string_list);
+        if (ret == AVAHI_ERR_COLLISION) {
+          die("Error: AirPlay 1 name \"%s\" is already in use.", service_name);
+        }
     }
     if (ret == 0) {
       ret = avahi_entry_group_commit(group);