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/* Test for memalign.
Copyright (C) 2013-2026 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 <stdio.h>
#include <string.h>
#include <unistd.h>
#include <libc-diag.h>
#include "tst-malloc-aux.h"
static int errors = 0;
static void
merror (const char *msg)
{
++errors;
printf ("Error: %s\n", msg);
}
static int
do_test (void)
{
void *p;
unsigned long pagesize = getpagesize ();
unsigned long ptrval;
int save;
errno = 0;
DIAG_PUSH_NEEDS_COMMENT;
#if __GNUC_PREREQ (7, 0)
/* GCC 7 warns about too-large allocations; here we want to test
that they fail. */
DIAG_IGNORE_NEEDS_COMMENT (7, "-Walloc-size-larger-than=");
#endif
/* An attempt to allocate a huge value should return NULL and set
errno to ENOMEM. */
p = memalign (sizeof (void *), -1);
#if __GNUC_PREREQ (7, 0)
DIAG_POP_NEEDS_COMMENT;
#endif
save = errno;
if (p != NULL)
merror ("memalign (sizeof (void *), -1) succeeded.");
if (p == NULL && save != ENOMEM)
merror ("memalign (sizeof (void *), -1) errno is not set correctly");
free (p);
errno = 0;
/* Test to expose integer overflow in malloc internals from BZ #15857. */
p = memalign (pagesize, -pagesize);
save = errno;
if (p != NULL)
merror ("memalign (pagesize, -pagesize) succeeded.");
if (p == NULL && save != ENOMEM)
merror ("memalign (pagesize, -pagesize) errno is not set correctly");
free (p);
errno = 0;
/* Test to expose integer overflow in malloc internals from BZ #16038. */
p = memalign (-1, pagesize);
save = errno;
if (p != NULL)
merror ("memalign (-1, pagesize) succeeded.");
if (p == NULL && save != EINVAL)
merror ("memalign (-1, pagesize) errno is not set correctly");
free (p);
/* A zero-sized allocation should succeed with glibc, returning a
non-NULL value. */
p = memalign (sizeof (void *), 0);
if (p == NULL)
merror ("memalign (sizeof (void *), 0) failed.");
free (p);
/* Check the alignment of the returned pointer is correct. */
p = memalign (0x100, 10);
if (p == NULL)
merror ("memalign (0x100, 10) failed.");
ptrval = (unsigned long) p;
if ((ptrval & 0xff) != 0)
merror ("pointer is not aligned to 0x100");
free (p);
/* Check the alignment is rounded up to a power of 2. */
p = memalign (257, 10);
if (p == NULL)
merror ("memalign (257, 10) failed.");
ptrval = (unsigned long) p;
if ((ptrval & 0x1ff) != 0)
merror ("pointer is not aligned to 0x200");
free (p);
return errors != 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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