/* 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 *__curbrk; 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 (__curbrk == NULL) if (brk (0) < 0) /* Initialize the break. */ return (void *) -1; if (increment == 0) return __curbrk; oldbrk = __curbrk; if (brk (oldbrk + increment) < 0) return (void *) -1; return oldbrk; }