From 943e80365394df36a41fa19b6e3227f11f044cb6 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Sun, 15 Dec 2024 21:47:42 -0500
Subject: kernel: Add offsetof in cdefs.h

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/include/sys/cdefs.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/include/sys/cdefs.h b/sys/include/sys/cdefs.h
index e5d5531..92cdec3 100644
--- a/sys/include/sys/cdefs.h
+++ b/sys/include/sys/cdefs.h
@@ -48,6 +48,10 @@
 #define __END_DECLS
 #endif
 
+#ifndef offsetof
+#define offsetof(st, m) ((size_t)&(((st *)0)->m))
+#endif  /* offsetof */
+
 #if defined(_KERNEL)
 /*
  *  Align data on a cache line boundary. This is
-- 
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