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50 lines
1.7 KiB
C
50 lines
1.7 KiB
C
/* Common mmap definition for Linux implementation.
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Copyright (C) 2017-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef MMAP_INTERNAL_LINUX_H
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#define MMAP_INTERNAL_LINUX_H 1
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/* This is the minimum mmap2 unit size accept by the kernel. An architecture
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with multiple minimum page sizes (such as m68k) might define it as -1 and
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thus it will queried at runtime. */
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#ifndef MMAP2_PAGE_UNIT
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# define MMAP2_PAGE_UNIT 4096ULL
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#endif
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#if MMAP2_PAGE_UNIT == -1
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static uint64_t page_unit;
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# define MMAP_CHECK_PAGE_UNIT() \
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if (page_unit == 0) \
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page_unit = __getpagesize ();
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# undef MMAP2_PAGE_UNIT
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# define MMAP2_PAGE_UNIT page_unit
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#else
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# define MMAP_CHECK_PAGE_UNIT()
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#endif
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/* Do not accept offset not multiple of page size. */
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#define MMAP_OFF_LOW_MASK (MMAP2_PAGE_UNIT - 1)
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/* An architecture may override this. */
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#ifndef MMAP_CALL
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# define MMAP_CALL(__nr, __addr, __len, __prot, __flags, __fd, __offset) \
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INLINE_SYSCALL_CALL (__nr, __addr, __len, __prot, __flags, __fd, __offset)
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#endif
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#endif /* MMAP_INTERNAL_LINUX_H */
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