blob: 6c9b534c322bce2462e19b2a501f276a2111987f [file] [log] [blame]
The Android Open Source Project1dc9e472009-03-03 19:28:35 -08001/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
Elliott Hughes428f5562013-02-05 16:10:59 -080028
The Android Open Source Project1dc9e472009-03-03 19:28:35 -080029#include <unistd.h>
30#include <errno.h>
31
Elliott Hughes428f5562013-02-05 16:10:59 -080032/* Shared with brk.c. */
33extern "C" {
34 void* __bionic_brk; // TODO: should be __LIBC_HIDDEN__ but accidentally exported by NDK :-(
35}
The Android Open Source Project1dc9e472009-03-03 19:28:35 -080036
Elliott Hughes428f5562013-02-05 16:10:59 -080037void* sbrk(ptrdiff_t increment) {
38 if (__bionic_brk == NULL) {
39 __bionic_brk = __brk(NULL);
The Android Open Source Project1dc9e472009-03-03 19:28:35 -080040 }
41
Elliott Hughes428f5562013-02-05 16:10:59 -080042 void* original_brk = __bionic_brk;
43 void* desired_brk = (void*) ((uintptr_t) original_brk + increment);
44
45 void* new_brk = __brk(desired_brk);
46 if (new_brk == (void*) -1) {
47 return new_brk;
48 } else if (new_brk < desired_brk) {
49 errno = ENOMEM;
50 return (void*) -1;
51 }
52
53 __bionic_brk = new_brk;
54 return original_brk;
The Android Open Source Project1dc9e472009-03-03 19:28:35 -080055}