From eb780c49acd8781355d61927eceac6abb9804cb5 Mon Sep 17 00:00:00 2001
From: yellows8 <yellows8@users.noreply.github.com>
Date: Fri, 1 Aug 2025 12:41:13 -0400
Subject: [PATCH] ldn: Allow using an user-specified priority.

---
 nx/include/switch/services/ldn.h | 4 ++++
 nx/source/services/ldn.c         | 5 +++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/nx/include/switch/services/ldn.h b/nx/include/switch/services/ldn.h
index 1ff59070..c2ce3478 100644
--- a/nx/include/switch/services/ldn.h
+++ b/nx/include/switch/services/ldn.h
@@ -10,6 +10,9 @@
 #include "../sf/service.h"
 #include "../kernel/event.h"
 
+#define LDN_PRIORITY_SYSTEM 0x38       ///< System priority for __nx_ldn_priority.
+#define LDN_PRIORITY_USER 0x5A         ///< User priority for __nx_ldn_priority.
+
 typedef enum {
     LdnServiceType_User           = 0, ///< Initializes ldn:u.
     LdnServiceType_System         = 1, ///< Initializes ldn:s.
@@ -276,6 +279,7 @@ Result ldnmGetNetworkConfig(LdnNetworkConfig *out);
 ///@{
 
 /// Initialize ldn.
+/// The priority is only used with ::LdnServiceType_System on [19.0.0+]. To optionally set this, define "s32 __nx_ldn_priority". The priority must be \ref LDN_PRIORITY_SYSTEM (default) or \ref LDN_PRIORITY_USER.
 Result ldnInitialize(LdnServiceType service_type);
 
 /// Exit ldn.
diff --git a/nx/source/services/ldn.c b/nx/source/services/ldn.c
index 2a2b31b5..f248ed98 100644
--- a/nx/source/services/ldn.c
+++ b/nx/source/services/ldn.c
@@ -6,6 +6,8 @@
 
 static LdnServiceType g_ldnServiceType;
 
+__attribute__((weak)) s32 __nx_ldn_priority = LDN_PRIORITY_SYSTEM;
+
 static Service g_ldnSrv;
 static Service g_ldnmSrv;
 
@@ -84,7 +86,6 @@ Result _ldnInitialize(LdnServiceType service_type) {
     Service srv_creator={0};
     Result rc = MAKERESULT(Module_Libnx, LibnxError_BadInput);
     s32 version=0;
-    s32 priority=0x38;
     g_ldnServiceType = service_type;
     switch (g_ldnServiceType) {
         case LdnServiceType_User:
@@ -109,7 +110,7 @@ Result _ldnInitialize(LdnServiceType service_type) {
                 version = 0x4;
 
             if (g_ldnServiceType == LdnServiceType_System && hosversionAtLeast(19,0,0))
-                rc = _ldnCmdInitializeWithPriority(version, priority);
+                rc = _ldnCmdInitializeWithPriority(version, __nx_ldn_priority);
             else
                 rc = _ldnCmdInitializeWithVersion(version);
         }