/* * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * File: sbrk.c * * Unix compatibility for sbrk system call. * * HISTORY * 09-Mar-90 Gregg Kellogg (gk) at NeXT. * include <kern/mach_interface.h> instead of <kern/mach.h> * * 14-Feb-89 Avadis Tevanian (avie) at NeXT. * Total rewrite using a fixed area of VM from break region. */ #include <mach/mach.h> /* for vm_allocate, vm_offset_t */ #include <mach/vm_statistics.h> #include <sys/types.h> /* for caddr_t */ static int sbrk_needs_init = TRUE; static vm_size_t sbrk_region_size = 4*1024*1024; /* Well, what should it be? */ static vm_address_t sbrk_curbrk; caddr_t sbrk(size) int size; { vm_offset_t addr; kern_return_t ret; caddr_t ocurbrk; extern int end; if (sbrk_needs_init) { sbrk_needs_init = FALSE; /* * Allocate a big region to simulate break region. */ ret = vm_allocate(mach_task_self(), &sbrk_curbrk, sbrk_region_size, VM_MAKE_TAG(VM_MEMORY_SBRK)|TRUE); if (ret != KERN_SUCCESS) return((caddr_t)-1); } if (size <= 0) return((caddr_t)sbrk_curbrk); sbrk_curbrk += size; sbrk_region_size -= size; if (sbrk_region_size < 0) return((caddr_t)-1); return((caddr_t)(sbrk_curbrk - size)); } caddr_t brk(x) caddr_t x; { return((caddr_t)-1); }