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/* Test mremap with MREMAP_FIXED.
Copyright (C) 2024-2025 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 <sys/mman.h>
#include <support/xstdlib.h>
#include <support/xunistd.h>
#include <support/test-driver.h>
#include <mremap-failure.h>
static int
do_test (void)
{
size_t old_size = getpagesize ();
size_t new_size = old_size + old_size;
char *old_addr = xmmap (NULL, old_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1);
old_addr[0] = 1;
old_addr[old_size - 1] = 2;
char *fixed_addr = xmmap (NULL, new_size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1);
fixed_addr[0] = 1;
fixed_addr[new_size - 1] = 2;
/* Test MREMAP_FIXED. */
char *new_addr = mremap (old_addr, old_size, new_size,
MREMAP_FIXED | MREMAP_MAYMOVE,
fixed_addr);
if (new_addr == MAP_FAILED)
return mremap_failure_exit (errno);
new_addr[0] = 1;
new_addr[new_size - 1] = 2;
xmunmap (new_addr, new_size);
return 0;
}
#include <support/test-driver.c>
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