72 lines
2.7 KiB
C
72 lines
2.7 KiB
C
/*
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* Copyright (C) 2017 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#pragma once
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#include <sys/cdefs.h>
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#if __ANDROID_API__ < 21
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#include <errno.h>
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#include <sys/mman.h>
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#include <unistd.h>
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__BEGIN_DECLS
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/*
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* While this was never an inline, this function alone has caused most of the
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* bug reports related to _FILE_OFFSET_BITS=64. Providing an inline for it
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* should allow a lot more code to build with _FILE_OFFSET_BITS=64 when
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* targeting pre-L.
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*/
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static __inline void* mmap64(void* __addr, size_t __size, int __prot, int __flags, int __fd,
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off64_t __offset) __RENAME(mmap64);
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static __inline void* mmap64(void* __addr, size_t __size, int __prot, int __flags, int __fd,
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off64_t __offset) {
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const int __mmap2_shift = 12; // 2**12 == 4096
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if (__offset < 0 || (__offset & ((1UL << __mmap2_shift) - 1)) != 0) {
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errno = EINVAL;
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return MAP_FAILED;
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}
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// prevent allocations large enough for `end - start` to overflow
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size_t __rounded = __BIONIC_ALIGN(__size, PAGE_SIZE);
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if (__rounded < __size || __rounded > PTRDIFF_MAX) {
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errno = ENOMEM;
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return MAP_FAILED;
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}
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extern void* __mmap2(void* __addr, size_t __size, int __prot, int __flags, int __fd,
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size_t __offset);
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return __mmap2(__addr, __size, __prot, __flags, __fd, __offset >> __mmap2_shift);
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}
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__END_DECLS
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#endif
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