428f5567be
Bug: https://code.google.com/p/android/issues/detail?id=37349 Change-Id: I970c7b6be7bb7fbe6bbbe2c332f05816aeb0e09f
56 lines
2.0 KiB
C++
56 lines
2.0 KiB
C++
/*
|
|
* Copyright (C) 2008 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 <unistd.h>
|
|
#include <errno.h>
|
|
|
|
/* Shared with brk.c. */
|
|
extern "C" {
|
|
void* __bionic_brk; // TODO: should be __LIBC_HIDDEN__ but accidentally exported by NDK :-(
|
|
}
|
|
|
|
void* sbrk(ptrdiff_t increment) {
|
|
if (__bionic_brk == NULL) {
|
|
__bionic_brk = __brk(NULL);
|
|
}
|
|
|
|
void* original_brk = __bionic_brk;
|
|
void* desired_brk = (void*) ((uintptr_t) original_brk + increment);
|
|
|
|
void* new_brk = __brk(desired_brk);
|
|
if (new_brk == (void*) -1) {
|
|
return new_brk;
|
|
} else if (new_brk < desired_brk) {
|
|
errno = ENOMEM;
|
|
return (void*) -1;
|
|
}
|
|
|
|
__bionic_brk = new_brk;
|
|
return original_brk;
|
|
}
|