From 80c42135017071b600f84ab871a98f66db5634a5 Mon Sep 17 00:00:00 2001
From: Bananymous <oskari.alaranta@bananymous.com>
Date: Tue, 7 Apr 2026 03:12:21 +0300
Subject: [PATCH] LibC: Make errno macro directly access uthread

This allows inlining errno usages

This breaks libc ABI and requires toolchain rebuild
---
 userspace/libraries/LibC/CMakeLists.txt  | 1 -
 userspace/libraries/LibC/errno.cpp       | 7 -------
 userspace/libraries/LibC/include/errno.h | 8 ++++----
 3 files changed, 4 insertions(+), 12 deletions(-)
 delete mode 100644 userspace/libraries/LibC/errno.cpp

diff --git a/userspace/libraries/LibC/CMakeLists.txt b/userspace/libraries/LibC/CMakeLists.txt
index 0798cd40..ec8e6bf2 100644
--- a/userspace/libraries/LibC/CMakeLists.txt
+++ b/userspace/libraries/LibC/CMakeLists.txt
@@ -7,7 +7,6 @@ set(LIBC_SOURCES
 	dlfcn.cpp
 	endian.cpp
 	environ.cpp
-	errno.cpp
 	fcntl.cpp
 	fenv.cpp
 	fnmatch.cpp
diff --git a/userspace/libraries/LibC/errno.cpp b/userspace/libraries/LibC/errno.cpp
deleted file mode 100644
index 707732c9..00000000
--- a/userspace/libraries/LibC/errno.cpp
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <errno.h>
-#include <pthread.h>
-
-int* __errno_location()
-{
-	return &_get_uthread()->errno_;
-}
diff --git a/userspace/libraries/LibC/include/errno.h b/userspace/libraries/LibC/include/errno.h
index 973cdbf3..6da5d87d 100644
--- a/userspace/libraries/LibC/include/errno.h
+++ b/userspace/libraries/LibC/include/errno.h
@@ -7,6 +7,10 @@
 
 __BEGIN_DECLS
 
+#include <bits/types/uthread.h>
+
+#define errno (_get_uthread()->errno_)
+
 #define E2BIG			1
 #define EACCES			2
 #define EADDRINUSE		3
@@ -94,10 +98,6 @@ __BEGIN_DECLS
 #define ERESTART        0xFE /* internal errno for SA_RESTART */
 #define EUNKNOWN		0xFF
 
-#define errno (*__errno_location())
-
-int* __errno_location(void);
-
 __END_DECLS
 
 #endif