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