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/* Copyright (C) 1991-2021 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, see
<https://www.gnu.org/licenses/>. */
#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)
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