linux-kernel - [PATCH 8/9] tools/nolibc: move NULL and offsetof() to sys/stddef.h

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Message-Id: <20250515-nolibc-sys-v1-8-74f82eea3b59@weissschuh.net>
Date: Thu, 15 May 2025 21:57:54 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Willy Tarreau <w@....eu>, Shuah Khan <shuah@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 8/9] tools/nolibc: move NULL and offsetof() to sys/stddef.h

This is the location regular userspace expects these definitions.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 tools/include/nolibc/Makefile |  1 +
 tools/include/nolibc/std.h    |  6 +-----
 tools/include/nolibc/stddef.h | 24 ++++++++++++++++++++++++
 tools/include/nolibc/types.h  |  4 ----
 4 files changed, 26 insertions(+), 9 deletions(-)

diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile
index 0ff06374577df457b0611d91dcfe637a05476364..c4615bed731ced75a00867fdeb455d72652a7e42 100644
--- a/tools/include/nolibc/Makefile
+++ b/tools/include/nolibc/Makefile
@@ -44,6 +44,7 @@ all_files := \
 		std.h \
 		stdarg.h \
 		stdbool.h \
+		stddef.h \
 		stdint.h \
 		stdlib.h \
 		string.h \
diff --git a/tools/include/nolibc/std.h b/tools/include/nolibc/std.h
index 933bc0be7e1c6be3b7909efc127f1d3b9c611135..adda7333d12e7d2c336938ede1aaf215b4b93165 100644
--- a/tools/include/nolibc/std.h
+++ b/tools/include/nolibc/std.h
@@ -13,12 +13,8 @@
  * syscall-specific stuff, as this file is expected to be included very early.
  */
 
-/* note: may already be defined */
-#ifndef NULL
-#define NULL ((void *)0)
-#endif
-
 #include "stdint.h"
+#include "stddef.h"
 
 /* those are commonly provided by sys/types.h */
 typedef unsigned int          dev_t;
diff --git a/tools/include/nolibc/stddef.h b/tools/include/nolibc/stddef.h
new file mode 100644
index 0000000000000000000000000000000000000000..ecbd13eab1f5190fd0e90a07699c2f06dbde8916
--- /dev/null
+++ b/tools/include/nolibc/stddef.h
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * Stddef definitions for NOLIBC
+ * Copyright (C) 2017-2021 Willy Tarreau <w@....eu>
+ */
+
+/* make sure to include all global symbols */
+#include "nolibc.h"
+
+#ifndef _NOLIBC_STDDEF_H
+#define _NOLIBC_STDDEF_H
+
+#include "stdint.h"
+
+/* note: may already be defined */
+#ifndef NULL
+#define NULL ((void *)0)
+#endif
+
+#ifndef offsetof
+#define offsetof(TYPE, FIELD) ((size_t) &((TYPE *)0)->FIELD)
+#endif
+
+#endif /* _NOLIBC_STDDEF_H */
diff --git a/tools/include/nolibc/types.h b/tools/include/nolibc/types.h
index 0071bfbc23154cf9b47b0bd747101fea4955018d..30904be544ed01b212042ebc0f4dab610f64b216 100644
--- a/tools/include/nolibc/types.h
+++ b/tools/include/nolibc/types.h
@@ -188,10 +188,6 @@ struct stat {
 typedef __kernel_clockid_t clockid_t;
 typedef int timer_t;
 
-#ifndef offsetof
-#define offsetof(TYPE, FIELD) ((size_t) &((TYPE *)0)->FIELD)
-#endif
-
 #ifndef container_of
 #define container_of(PTR, TYPE, FIELD) ({			\
 	__typeof__(((TYPE *)0)->FIELD) *__FIELD_PTR = (PTR);	\

-- 
2.49.0