lib: c: add fallback errno storage for single-threaded programs

2026-03-22 19:11:25 +00:00
parent a792bbe5db
commit 7b89a038a2
2 changed files with 14 additions and 0 deletions
--- a/lib/libc/core/errno/errno.c
+++ b/lib/libc/core/errno/errno.c
@@ -1,6 +1,15 @@
 #include <errno.h>
+#include <mango/log.h>
 #include <mango/status.h>

+static int __errno = 32;
+
+int __attribute__((weak)) * __errno_location(void)
+{
+	kern_log("using builtin errno");
+	return &__errno;
+}
+
 #if defined(BUILD_STATIC)
 int __set_errno(int err)
 {
@@ -12,6 +21,7 @@ int __set_errno(int err)
 int __set_errno(int err)
 {
 	/* TODO */
+	*__errno_location() = err;
 	return -1;
 }
 #endif