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- /* Copyright (C) 1991, 1994 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 Library General Public License as
- published by the Free Software Foundation; either version 2 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
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- Cambridge, MA 02139, USA. */
-
- #include <ansidecl.h>
- #include <errno.h>
- #include <hurd.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. */
- PTR
- DEFUN(__sbrk, (increment), int increment)
- {
- PTR result;
-
- HURD_CRITICAL_BEGIN;
- __mutex_lock (&_hurd_brk_lock);
- result = (PTR) _hurd_brk;
- if (increment != 0 && _hurd_set_brk (_hurd_brk + increment) < 0)
- result = (PTR) -1;
- __mutex_unlock (&_hurd_brk_lock);
- HURD_CRITICAL_END;
-
- return result;
- }
-