| /* |
| * Copyright (C) 2015 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. |
| */ |
| |
| #include <errno.h> |
| #include <sys/mman.h> |
| #include <stdarg.h> |
| #include <stdint.h> |
| #include <unistd.h> |
| |
| #include "private/bionic_macros.h" |
| |
| extern "C" void* ___mremap(void*, size_t, size_t, int, void*); |
| |
| void* mremap(void* old_address, size_t old_size, size_t new_size, int flags, ...) { |
| // prevent allocations large enough for `end - start` to overflow |
| size_t rounded = BIONIC_ALIGN(new_size, PAGE_SIZE); |
| if (rounded < new_size || rounded > PTRDIFF_MAX) { |
| errno = ENOMEM; |
| return MAP_FAILED; |
| } |
| |
| void* new_address = nullptr; |
| // The optional argument is only valid if the MREMAP_FIXED flag is set, |
| // so we assume it's not present otherwise. |
| if ((flags & MREMAP_FIXED) != 0) { |
| va_list ap; |
| va_start(ap, flags); |
| new_address = va_arg(ap, void*); |
| va_end(ap); |
| } |
| return ___mremap(old_address, old_size, new_size, flags, new_address); |
| } |