| /* Common mmap definition for Linux implementation. |
| Copyright (C) 2017-2018 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 */ |
