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From: Ammar Faizi <[email protected]>
To: Willy Tarreau <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>,
	Alviro Iskandar Setiawan <[email protected]>,
	Nugraha <[email protected]>,
	Linux Kernel Mailing List <[email protected]>,
	GNU/Weeb Mailing List <[email protected]>,
	Ammar Faizi <[email protected]>
Subject: [RFC PATCH v2 5/8] tools/nolibc/types: Implement `offsetof()` and `container_of()` macro
Date: Tue, 22 Mar 2022 17:21:12 +0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

Implement `offsetof()` and `container_of()` macro. The first use case
of these macros is for `malloc()`, `realloc()` and `free()`.

Signed-off-by: Ammar Faizi <[email protected]>
---
 tools/include/nolibc/types.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/include/nolibc/types.h b/tools/include/nolibc/types.h
index 357e60ad38a8..959997034e55 100644
--- a/tools/include/nolibc/types.h
+++ b/tools/include/nolibc/types.h
@@ -191,4 +191,15 @@ struct stat {
 #define major(dev) ((unsigned int)(((dev) >> 8) & 0xfff))
 #define minor(dev) ((unsigned int)(((dev) & 0xff))
 
+#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);	\
+	(TYPE *)((char *) __FIELD_PTR - offsetof(TYPE, FIELD));	\
+})
+#endif
+
 #endif /* _NOLIBC_TYPES_H */
-- 
Ammar Faizi


  parent reply	other threads:[~2022-03-22 10:21 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-22 10:21 [RFC PATCH v2 0/8] Add dynamic memory allocator support for nolibc Ammar Faizi
2022-03-22 10:21 ` [RFC PATCH v2 1/8] tools/nolibc: x86-64: Update System V ABI document link Ammar Faizi
2022-03-22 10:21 ` [RFC PATCH v2 2/8] tools/nolibc: Remove .global _start from the entry point code Ammar Faizi
2022-03-22 17:09   ` Nick Desaulniers
2022-03-22 17:25     ` Willy Tarreau
2022-03-22 17:30       ` Nick Desaulniers
2022-03-22 17:58         ` Willy Tarreau
2022-03-22 18:07           ` Nick Desaulniers
2022-03-22 18:24             ` Willy Tarreau
2022-03-22 18:38               ` Nick Desaulniers
2022-03-22 10:21 ` [RFC PATCH v2 3/8] tools/nolibc: i386: Implement syscall with 6 arguments Ammar Faizi
2022-03-22 10:57   ` David Laight
2022-03-22 11:23     ` Willy Tarreau
2022-03-22 11:39   ` David Laight
2022-03-22 12:02     ` Ammar Faizi
2022-03-22 12:07       ` Ammar Faizi
2022-03-22 12:13       ` Willy Tarreau
2022-03-22 13:26         ` Ammar Faizi
2022-03-22 13:34           ` Willy Tarreau
2022-03-22 13:37             ` Ammar Faizi
2022-03-22 13:39               ` David Laight
2022-03-22 13:41                 ` Willy Tarreau
2022-03-22 13:45                   ` Ammar Faizi
2022-03-22 13:54                     ` Ammar Faizi
2022-03-22 13:56                       ` Ammar Faizi
2022-03-22 14:02                         ` Willy Tarreau
2022-03-22 13:37         ` David Laight
2022-03-22 14:47           ` Alviro Iskandar Setiawan
2022-03-22 15:11             ` David Laight
2022-03-23  6:29           ` Ammar Faizi
2022-03-23  6:32             ` Ammar Faizi
2022-03-23  7:10             ` Willy Tarreau
2022-03-22 10:21 ` [RFC PATCH v2 4/8] tools/nolibc/sys: Implement `mmap()` and `munmap()` Ammar Faizi
2022-03-22 10:21 ` Ammar Faizi [this message]
2022-03-22 10:21 ` [RFC PATCH v2 6/8] tools/nolibc/stdlib: Implement `malloc()`, `calloc()`, `realloc()` and `free()` Ammar Faizi
2022-03-22 11:52   ` David Laight
2022-03-22 12:18     ` Ammar Faizi
2022-03-22 12:36       ` Alviro Iskandar Setiawan
2022-03-22 12:42         ` Ammar Faizi
2022-03-22 12:21     ` Willy Tarreau
2022-03-22 10:21 ` [RFC PATCH v2 7/8] tools/nolibc/string: Implement `strnlen()` Ammar Faizi
2022-03-22 10:21 ` [RFC PATCH v2 8/8] tools/include/string: Implement `strdup()` and `strndup()` Ammar Faizi
2022-03-22 11:27 ` [RFC PATCH v2 0/8] Add dynamic memory allocator support for nolibc Willy Tarreau
2022-03-22 12:43   ` Ammar Faizi

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