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/* Copyright (C) 1991, 1995, 1996, 1997, 2000 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 <unistd.h>
#include <errno.h>
/* Defined in brk.c. */
extern void *___brk_addr;
extern int brk (void *addr);
/* Extend the process's data space by INCREMENT.
If INCREMENT is negative, shrink data space by - INCREMENT.
Return start of new space allocated, or -1 for errors. */
void * sbrk (intptr_t increment)
{
void *oldbrk;
if (___brk_addr == NULL)
if (brk (0) < 0) /* Initialize the break. */
return (void *) -1;
if (increment == 0)
return ___brk_addr;
oldbrk = ___brk_addr;
if (brk (oldbrk + increment) < 0)
return (void *) -1;
return oldbrk;
}
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