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/*
* Copyright (c) 1993 Paul Kranenburg
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Paul Kranenburg.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software withough specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: sbrk.c,v 1.1 1993/12/11 21:06:36 jkh Exp $
*/
#include <machine/vmparam.h>
#include <sys/param.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/mman.h>
#ifndef BSD
#define MAP_COPY MAP_PRIVATE
#define MAP_FILE 0
#define MAP_ANON 0
#endif
#include <fcntl.h>
#include <a.out.h>
#include <stab.h>
#include <string.h>
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include <machine/param.h>
#ifndef BSD /* Need do better than this */
#define NEED_DEV_ZERO 1
#endif
caddr_t
sbrk(incr)
int incr;
{
int fd = -1;
caddr_t curbrk;
/* Round-up increment to page size */
incr = ((incr + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1));
#if DEBUG
xprintf("sbrk: incr = %#x\n", incr);
#endif
#ifdef NEED_DEV_ZERO
fd = open("/dev/zero", O_RDWR, 0);
if (fd == -1)
perror("/dev/zero");
#endif
if ((curbrk = mmap(0, incr,
PROT_READ|PROT_WRITE,
MAP_ANON|MAP_COPY, fd, 0)) == (caddr_t)-1) {
xprintf("Cannot map anonymous memory");
_exit(1);
}
#ifdef DEBUG
xprintf("sbrk: curbrk = %#x\n", curbrk);
#endif
#ifdef NEED_DEV_ZERO
close(fd);
#endif
return(curbrk);
}
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