mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-23 13:30:06 +00:00
50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/* Common mmap definition for Linux implementation.
|
|
Copyright (C) 2017-2020 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 */
|