95c6cd753f
Historically we've made a few mistakes where they haven't matched the right number. And most non-Googlers are much more familiar with the numbers, so it seems to make sense to rely more on them. Especially in header files, which we actually expect real people to have to read from time to time. Test: treehugger Change-Id: I0d4a97454ee108de1d32f21df285315c5488d886
71 lines
2.7 KiB
C
71 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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