1/* Change data segment. Linux generic version.
2 Copyright (C) 2020-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <unistd.h>
21#include <sysdep.h>
22#include <brk_call.h>
23
24/* This must be initialized data because commons can't have aliases. */
25void *__curbrk = 0;
26
27#if HAVE_INTERNAL_BRK_ADDR_SYMBOL
28/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
29 to work around different old braindamage in the old Linux ELF dynamic
30 linker. */
31weak_alias (__curbrk, ___brk_addr)
32#endif
33
34int
35__brk (void *addr)
36{
37 __curbrk = __brk_call (addr);
38 if (__curbrk < addr)
39 {
40 __set_errno (ENOMEM);
41 return -1;
42 }
43
44 return 0;
45}
46weak_alias (__brk, brk)
47