derek.holloway
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33 lines
1.3 KiB
C++
33 lines
1.3 KiB
C++
//===-- MmapUtils.h ---------------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains compatibility-related preprocessor directives related
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// to mmap.
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//
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//===----------------------------------------------------------------------===//
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#ifdef __linux__
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#include <sys/mman.h>
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#include <sys/syscall.h>
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// Before kernel 4.17, Linux did not support MAP_FIXED_NOREPLACE, so if it is
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// not available, simplfy define it as MAP_FIXED which performs the same
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// function but does not guarantee existing mappings won't get clobbered.
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#ifndef MAP_FIXED_NOREPLACE
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#define MAP_FIXED_NOREPLACE MAP_FIXED
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#endif
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// Some 32-bit architectures don't have mmap and define mmap2 instead. The only
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// difference between the two syscalls is that mmap2's offset parameter is in
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// terms 4096 byte offsets rather than individual bytes, so for our purposes
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// they are effectively the same as all ofsets here are set to 0.
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#if defined(SYS_mmap2) && !defined(SYS_mmap)
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#define SYS_mmap SYS_mmap2
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#endif
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#endif // __linux__
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