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/* Common mmap definition for Linux implementation.
Copyright (C) 2017-2021 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/>. */
#ifndef MMAP_INTERNAL_LINUX_H
#define MMAP_INTERNAL_LINUX_H 1
/* This is the minimum mmap2 unit size accept by the kernel. An architecture
with multiple minimum page sizes (such as m68k) might define it as -1 and
thus it will queried at runtime. */
#ifndef MMAP2_PAGE_UNIT
# define MMAP2_PAGE_UNIT 4096ULL
#endif
#if MMAP2_PAGE_UNIT == -1
static uint64_t page_unit;
# define MMAP_CHECK_PAGE_UNIT() \
if (page_unit == 0) \
page_unit = __getpagesize ();
# undef MMAP2_PAGE_UNIT
# define MMAP2_PAGE_UNIT page_unit
#else
# define MMAP_CHECK_PAGE_UNIT()
#endif
/* Do not accept offset not multiple of page size. */
#define MMAP_OFF_LOW_MASK (MMAP2_PAGE_UNIT - 1)
/* An architecture may override this. */
#ifndef MMAP_CALL
# define MMAP_CALL(__nr, __addr, __len, __prot, __flags, __fd, __offset) \
INLINE_SYSCALL_CALL (__nr, __addr, __len, __prot, __flags, __fd, __offset)
#endif
#endif /* MMAP_INTERNAL_LINUX_H */
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