| 1 | /* Common mmap definition for Linux implementation. |
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| 2 | Copyright (C) 2017-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef MMAP_INTERNAL_LINUX_H |
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| 20 | #define MMAP_INTERNAL_LINUX_H 1 |
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| 21 | |
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| 22 | #include <stdint.h> |
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| 23 | |
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| 24 | /* This is the minimum mmap2 unit size accept by the kernel. An architecture |
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| 25 | with multiple minimum page sizes (such as m68k) might define it as -1 and |
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| 26 | thus it will queried at runtime. */ |
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| 27 | #ifndef MMAP2_PAGE_UNIT |
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| 28 | # define MMAP2_PAGE_UNIT 4096ULL |
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| 29 | #endif |
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| 30 | |
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| 31 | #if MMAP2_PAGE_UNIT == -1 |
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| 32 | static uint64_t page_unit; |
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| 33 | # define MMAP_CHECK_PAGE_UNIT() \ |
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| 34 | if (page_unit == 0) \ |
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| 35 | page_unit = __getpagesize (); |
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| 36 | # undef MMAP2_PAGE_UNIT |
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| 37 | # define MMAP2_PAGE_UNIT page_unit |
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| 38 | #else |
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| 39 | # define MMAP_CHECK_PAGE_UNIT() |
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| 40 | #endif |
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| 41 | |
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| 42 | /* Do not accept offset not multiple of page size. */ |
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| 43 | #define MMAP_OFF_LOW_MASK (MMAP2_PAGE_UNIT - 1) |
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| 44 | |
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| 45 | #include <mmap_call.h> |
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| 46 | |
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| 47 | #endif /* MMAP_INTERNAL_LINUX_H */ |
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| 48 | |
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