1/* brk system call for Linux/x86_64.
2 Copyright (C) 1995-2020 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
26int
27__brk (void *addr)
28{
29 void *newbrk;
30
31 __curbrk = newbrk = (void *) INLINE_SYSCALL (brk, 1, addr);
32
33 if (newbrk < addr)
34 {
35 __set_errno (ENOMEM);
36 return -1;
37 }
38
39 return 0;
40}
41weak_alias (__brk, brk)
42