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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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80
malloc/tst-aligned-alloc.c Normal file
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/* Test for C17 alignment requirements.
Copyright (C) 2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <malloc.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libc-diag.h>
#include <support/check.h>
static int
do_test (void)
{
void *p1;
void *p2;
void *p3;
void *p4;
void *p5;
errno = 0;
/* The implementation supports alignments that are non-negative powers of 2.
We test 5 distinct conditions here:
- A non-negative power of 2 alignment e.g. 64.
- A degenerate zero power of 2 alignment e.g. 1.
- A non-power-of-2 alignment e.g. 65.
- A zero alignment.
- A corner case SIZE_MAX / 2 + 1 alignment.
*/
p1 = aligned_alloc (64, 64);
if (p1 == NULL)
FAIL_EXIT1 ("aligned_alloc(64, 64) failed");
p2 = aligned_alloc (1, 64);
if (p2 == NULL)
FAIL_EXIT1 ("aligned_alloc(1, 64) failed");
p3 = aligned_alloc (65, 64);
if (p3 != NULL)
FAIL_EXIT1 ("aligned_alloc(65, 64) did not fail");
p4 = aligned_alloc (0, 64);
if (p4 != NULL)
FAIL_EXIT1 ("aligned_alloc(0, 64) did not fail");
/* This is an alignment like 0x80000000...UL */
p5 = aligned_alloc (SIZE_MAX / 2 + 1, 64);
if (p5 != NULL)
FAIL_EXIT1 ("aligned_alloc(SIZE_MAX/2+1, 64) did not fail");
free (p1);
free (p2);
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"