1 /* Copyright (C) 1991-2022 Free Software Foundation, Inc. 2 This file is part of the GNU C Library. 3 4 The GNU C Library is free software; you can redistribute it and/or 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. 8 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 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with the GNU C Library; if not, see 16 <https://www.gnu.org/licenses/>. */ 17 18 #include <errno.h> 19 #include <hurd.h> 20 #include <unistd.h> 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. */ 25 void * __sbrk(intptr_t increment)26__sbrk (intptr_t increment) 27 { 28 void *result; 29 30 HURD_CRITICAL_BEGIN; 31 __mutex_lock (&_hurd_brk_lock); 32 result = (void *) _hurd_brk; 33 if (increment != 0 && _hurd_set_brk (_hurd_brk + increment) < 0) 34 result = (void *) -1; 35 __mutex_unlock (&_hurd_brk_lock); 36 HURD_CRITICAL_END; 37 38 return result; 39 } 40 libc_hidden_def (__sbrk) 41 weak_alias (__sbrk, sbrk) 42