From 72a8b41fd5fb3a25868eed1b05ef26f91dea92df Mon Sep 17 00:00:00 2001
From: Takoroka <137927095+Takoroka@users.noreply.github.com>
Date: Sat, 31 Oct 2026 03:02:17 -0400
Subject: bsd: handle the Switch 2 client registration command 36

Switch 2 titles register with bsd 36 (16 bytes and the pid, a bsd errno back)
instead of RegisterClient. It was nullptr, so the errno was left to the
message buffer's leftovers and Minecraft's socket layer failed later. Answer
it like RegisterClient.
---
 src/core/hle/service/sockets/bsd.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/core/hle/service/sockets/bsd.cpp b/src/core/hle/service/sockets/bsd.cpp
index 0137a3be66..9ec5e38c41 100644
--- a/src/core/hle/service/sockets/bsd.cpp
+++ b/src/core/hle/service/sockets/bsd.cpp
@@ -1121,7 +1121,10 @@ BSD_USA::BSD_USA(Core::System& system_, const char* name, bool is_user_)
         {33, nullptr, "RegisterClientShared"}, //10.0.0+
         {34, nullptr, "GetSocketStatistics"}, //15.0.0+
         {35, nullptr, "NifIoctl"}, //17.0.0+
-        {36, nullptr, "Unknown36"}, //18.0.0+
+        // Switch 2 titles register with 36 (16 bytes and the pid; a bsd errno back) instead of
+        // RegisterClient. The auto stub left the errno to the message buffer's leftovers, and
+        // Minecraft's socket layer failed later in EventFd.
+        {36, &BSD_USA::RegisterClient, "RegisterClientSwitch2"}, //18.0.0+
         {37, nullptr, "Unknown37"}, //18.0.0+
         {38, nullptr, "Unknown38"}, //18.0.0+
         {39, nullptr, "Unknown39"}, //20.0.0+
-- 
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