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/*
* Copyright (C) 2013-2021 Canonical, Ltd.
* Copyright (C) 2022-2025 Colin Ian King.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "stress-ng.h"
#include "core-mlock.h"
/*
* stress_mlock_region
* mlock a region of memory so it can't be swapped out
* - used to lock sighandlers for faster response
*/
int stress_mlock_region(const void *addr_start, const void *addr_end)
{
#if defined(HAVE_MLOCK)
const size_t page_size = stress_get_page_size();
const void *m_addr_start =
(void *)((uintptr_t)addr_start & ~(page_size - 1));
const void *m_addr_end =
(void *)(((uintptr_t)addr_end + page_size - 1) &
~(page_size - 1));
const size_t len = (uintptr_t)m_addr_end - (uintptr_t)m_addr_start;
return shim_mlock((const void *)m_addr_start, len);
#else
UNEXPECTED
(void)addr_start;
(void)addr_end;
return 0;
#endif
}
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