cosmopolitan/libc/mem/memalign.c

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ Copyright 2023 Justine Alexandra Roberts Tunney                              │
│                                                                              │
│ Permission to use, copy, modify, and/or distribute this software for         │
│ any purpose with or without fee is hereby granted, provided that the         │
│ above copyright notice and this permission notice appear in all copies.      │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
│ PERFORMANCE OF THIS SOFTWARE.                                                │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/mem/hook.internal.h"
#include "libc/mem/mem.h"
#include "third_party/dlmalloc/dlmalloc.h"

void *(*hook_memalign)(size_t, size_t) = dlmemalign;

/**
 * Allocates aligned memory.
 *
 * Returns a pointer to a newly allocated chunk of n bytes, aligned in
 * accord with the alignment argument. The alignment argument shall be
 * rounded up to the nearest two power and higher 2 powers may be used
 * if the allocator imposes a minimum alignment requirement.
 *
 * @param align is alignment in bytes, coerced to 1+ w/ 2-power roundup
 * @param bytes is number of bytes needed, coerced to 1+
 * @return rax is memory address, or NULL w/ errno
 * @see valloc(), pvalloc()
 */
void *memalign(size_t align, size_t bytes) {
  return hook_memalign(align, bytes);
}