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aligned_alloc: conform to C17

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This patch adds the strict checking for power-of-two alignments
in aligned_alloc(), and updates the manual accordingly.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
DJ Delorie
2023-03-21 00:46:43 -04:00
parent cea74a4a24
commit d1417176a3
6 changed files with 117 additions and 7 deletions
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26
malloc/malloc.c
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@ -3528,6 +3528,29 @@ __libc_memalign (size_t alignment, size_t bytes)
void *address = RETURN_ADDRESS (0);
return _mid_memalign (alignment, bytes, address);
}
libc_hidden_def (__libc_memalign)
/* For ISO C17. */
void *
weak_function
aligned_alloc (size_t alignment, size_t bytes)
{
if (!__malloc_initialized)
ptmalloc_init ();
/* Similar to memalign, but starting with ISO C17 the standard
requires an error for alignments that are not supported by the
implementation. Valid alignments for the current implementation
are non-negative powers of two. */
if (!powerof2 (alignment) || alignment == 0)
{
__set_errno (EINVAL);
return 0;
}
void *address = RETURN_ADDRESS (0);
return _mid_memalign (alignment, bytes, address);
}
static void *
_mid_memalign (size_t alignment, size_t bytes, void *address)
@ -3618,9 +3641,6 @@ _mid_memalign (size_t alignment, size_t bytes, void *address)
ar_ptr == arena_for_chunk (mem2chunk (p)));
return tag_new_usable (p);
}
/* For ISO C11. */
weak_alias (__libc_memalign, aligned_alloc)
libc_hidden_def (__libc_memalign)
void *
__libc_valloc (size_t bytes)