From a792bbe5db99c9b7761cafa509fd14e22672b653 Mon Sep 17 00:00:00 2001
From: Max Wash <mbswash@gmail.com>
Date: Sun, 22 Mar 2026 19:09:18 +0000
Subject: [PATCH] lib: c: pthread: implement per-thread errno storage

---
 lib/libc/pthread/thread/errno.c   | 12 ++++++++++++
 lib/libc/pthread/thread/pthread.h |  1 +
 2 files changed, 13 insertions(+)
 create mode 100644 lib/libc/pthread/thread/errno.c

diff --git a/lib/libc/pthread/thread/errno.c b/lib/libc/pthread/thread/errno.c
new file mode 100644
index 0000000..c1d32c5
--- /dev/null
+++ b/lib/libc/pthread/thread/errno.c
@@ -0,0 +1,12 @@
+#include "pthread.h"
+
+#include <mango/log.h>
+#include <pthread.h>
+#include <stdio.h>
+
+int *__errno_location(void)
+{
+	struct __pthread *self = pthread_self();
+	kern_logf("using pthread errno %p", &self->thr_errno);
+	return &self->thr_errno;
+}
diff --git a/lib/libc/pthread/thread/pthread.h b/lib/libc/pthread/thread/pthread.h
index 3854097..905ea9d 100644
--- a/lib/libc/pthread/thread/pthread.h
+++ b/lib/libc/pthread/thread/pthread.h
@@ -9,6 +9,7 @@ enum pthread_flags {
 
 struct __pthread {
 	struct __pthread *thr_self;
+	int thr_errno;
 	enum pthread_flags thr_flags;
 	kern_handle_t thr_handle;
 	void *thr_map_base;