From a43ddba87c72ab4112b16f7de41bbe5be8472b3e Mon Sep 17 00:00:00 2001
From: Ryan Houdek <Sonicadvance1@gmail.com>
Date: Thu, 10 Apr 2025 13:08:06 -0700
Subject: [PATCH] LinuxSyscalls: Fixes 32-bit llseek result

`llseek` returns only ever 0 or errno in the return register. This is in
contrast to `lseek` which returns the result (or errno) in the return
register.

We were accidentally returning the result on non-error conditions which
could freak out some software. Thanks to
[OFFTKP](https://github.com/OFFTKP) for pointing out this issue
---
 Source/Tools/LinuxEmulation/LinuxSyscalls/x32/FD.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Source/Tools/LinuxEmulation/LinuxSyscalls/x32/FD.cpp b/Source/Tools/LinuxEmulation/LinuxSyscalls/x32/FD.cpp
index 9d9525a23..4e73c789f 100644
--- a/Source/Tools/LinuxEmulation/LinuxSyscalls/x32/FD.cpp
+++ b/Source/Tools/LinuxEmulation/LinuxSyscalls/x32/FD.cpp
@@ -293,6 +293,8 @@ void RegisterFD(FEX::HLE::SyscallHandler* Handler) {
       if (Result != -1) {
         FaultSafeUserMemAccess::VerifyIsWritable(result, sizeof(*result));
         *result = Result;
+        // On non-error result, llseek returns zero (As the result is returned in pointer).
+        return 0;
       }
       SYSCALL_ERRNO();
     });