| /* Copyright (C) 1991,94,95,97,98,2000,02 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <errno.h> |
| #include <hurd.h> |
| #include <unistd.h> |
| |
| /* Extend the process's data space by INCREMENT. |
| If INCREMENT is negative, shrink data space by - INCREMENT. |
| Return the address of the start of the new data space, or -1 for errors. */ |
| void * |
| __sbrk (intptr_t increment) |
| { |
| void *result; |
| |
| HURD_CRITICAL_BEGIN; |
| __mutex_lock (&_hurd_brk_lock); |
| result = (void *) _hurd_brk; |
| if (increment != 0 && _hurd_set_brk (_hurd_brk + increment) < 0) |
| result = (void *) -1; |
| __mutex_unlock (&_hurd_brk_lock); |
| HURD_CRITICAL_END; |
| |
| return result; |
| } |
| libc_hidden_def (__sbrk) |
| weak_alias (__sbrk, sbrk) |
