diff options
| author | Robert Clausecker <fuz@FreeBSD.org> | 2025-11-10 17:54:41 +0000 |
|---|---|---|
| committer | Robert Clausecker <fuz@FreeBSD.org> | 2025-12-12 10:32:58 +0000 |
| commit | 24ea81047de7c75fd57c54deda0b36c3225c367b (patch) | |
| tree | 802f24d2b6f4b3caa4322b41010f23ba97c194c5 /include | |
| parent | e72536a11fab2dbd17174a3205c394b82ae65b88 (diff) | |
lib/libc: implement C23 memalignment()
This new function computes the alignment of a pointer.
It is part of ISO/IEC 9899:2024, the new C standard.
If the pointer is a null pointer, null is returned.
I have tried to write an implementation that can cope
with traditional address-based architectures, even if
size_t and uintptr_t are of different length. Adjustments
may be needed for CHERI though.
A man page is provided, too. No unit test for now.
Reviewed by: kib, imp, ziaee (manpages), pauamma@gundo.com
Approved by: markj (mentor)
MFC after: 1 month
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D53673
(cherry picked from commit 6c57e368eb1777f6097158eeca2fcc175d068dba)
Diffstat (limited to 'include')
| -rw-r--r-- | include/stdlib.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/stdlib.h b/include/stdlib.h index 784cb63bfc5b..3e54b5feb6de 100644 --- a/include/stdlib.h +++ b/include/stdlib.h @@ -167,6 +167,14 @@ int at_quick_exit(void (*)(void)) __noexcept; _Noreturn void quick_exit(int) /* __noexcept -- not ready ABI issues? */; #endif /* __ISO_C_VISIBLE >= 2011 */ + +/* + * C23 extensions + */ +#if __ISO_C_VISIBLE >= 2023 +size_t memalignment(const void *) __pure2; +#endif /* __ISO_C_VISIBLE >= 2023 */ + /* * Extensions made by POSIX relative to C. */ |