1/* Change data segment. Linux generic version.
2 Copyright (C) 2020-2021 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
23/* This must be initialized data because commons can't have aliases. */
24void *__curbrk = 0;
25
26#if HAVE_INTERNAL_BRK_ADDR_SYMBOL
27/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
28 to work around different old braindamage in the old Linux ELF dynamic
29 linker. */
30weak_alias (__curbrk, ___brk_addr)
31#endif
32
33int
34__brk (void *addr)
35{
36 __curbrk = (void *) INTERNAL_SYSCALL_CALL (brk, addr);
37 if (__curbrk < addr)
38 {
39 __set_errno (ENOMEM);
40 return -1;
41 }
42
43 return 0;
44}
45weak_alias (__brk, brk)
46