| /* |
| * 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__ < 21 |
| |
| #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 |