| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849 |
- /* Common mmap definition for Linux implementation.
- Copyright (C) 2017-2019 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
- <http://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 */
|
