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/* Test the mlock2 function.
Copyright (C) 2017-2024 Free Software Foundation, Inc.
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 <stdio.h>
#include <support/check.h>
#include <support/xunistd.h>
#include <sys/mman.h>
/* Allocate a page using mmap. */
static void *
get_page (void)
{
return xmmap (NULL, 1, PROT_READ | PROT_WRITE,
MAP_ANONYMOUS | MAP_PRIVATE, -1);
}
static int
do_test (void)
{
/* Current kernels have a small reserve of locked memory, so this
test does not need any privileges to run. */
void *page = get_page ();
if (mlock (page, 1) != 0)
FAIL_EXIT1 ("mlock: %m\n");
xmunmap (page, 1);
page = get_page ();
if (mlock2 (page, 1, 0) != 0)
/* Should be implemented using mlock if necessary. */
FAIL_EXIT1 ("mlock2 (0): %m\n");
xmunmap (page, 1);
page = get_page ();
int ret = mlock2 (page, 1, MLOCK_ONFAULT);
if (ret != 0)
{
TEST_VERIFY (ret == -1);
if (errno != EINVAL)
/* EINVAL means the system does not support the mlock2 system
call. */
FAIL_EXIT1 ("mlock2 (0): %m\n");
else
puts ("warning: mlock2 system call not supported");
}
xmunmap (page, 1);
return 0;
}
#include <support/test-driver.c>
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