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581c785b | 1 | /* Copyright (C) 1991-2022 Free Software Foundation, Inc. |
ebbad4cc | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
ebbad4cc | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
28f540f4 | 8 | |
ebbad4cc UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
28f540f4 | 17 | |
28f540f4 RM |
18 | #include <errno.h> |
19 | #include <hurd.h> | |
d6765f1d | 20 | #include <unistd.h> |
28f540f4 RM |
21 | |
22 | /* Extend the process's data space by INCREMENT. | |
23 | If INCREMENT is negative, shrink data space by - INCREMENT. | |
24 | Return the address of the start of the new data space, or -1 for errors. */ | |
ebbad4cc | 25 | void * |
0ed99ce4 | 26 | __sbrk (intptr_t increment) |
28f540f4 | 27 | { |
ebbad4cc | 28 | void *result; |
28f540f4 RM |
29 | |
30 | HURD_CRITICAL_BEGIN; | |
31 | __mutex_lock (&_hurd_brk_lock); | |
ebbad4cc | 32 | result = (void *) _hurd_brk; |
28f540f4 | 33 | if (increment != 0 && _hurd_set_brk (_hurd_brk + increment) < 0) |
ebbad4cc | 34 | result = (void *) -1; |
28f540f4 RM |
35 | __mutex_unlock (&_hurd_brk_lock); |
36 | HURD_CRITICAL_END; | |
37 | ||
38 | return result; | |
39 | } | |
37ba7d66 | 40 | libc_hidden_def (__sbrk) |
28f540f4 | 41 | weak_alias (__sbrk, sbrk) |