vm_unix.c revision 1817 
1/*
2 * Copyright (c) 1988 University of Utah.
3 * Copyright (c) 1991, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * the Systems Programming Group of the University of Utah Computer
8 * Science Department.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
39 *
40 *	@(#)vm_unix.c	8.1 (Berkeley) 6/11/93
41 * $Id$
42 */
43
44/*
45 * Traditional sbrk/grow interface to VM
46 */
47#include <sys/param.h>
48#include <sys/systm.h>
49#include <sys/proc.h>
50#include <sys/resourcevar.h>
51
52#include <vm/vm.h>
53
54extern int swap_pager_full;
55
56struct obreak_args {
57	char	*nsiz;
58};
59
60/* ARGSUSED */
61int
62obreak(p, uap, retval)
63	struct proc *p;
64	struct obreak_args *uap;
65	int *retval;
66{
67	register struct vmspace *vm = p->p_vmspace;
68	vm_offset_t new, old;
69	int rv;
70	register int diff;
71
72	old = (vm_offset_t)vm->vm_daddr;
73	new = round_page(uap->nsiz);
74	if ((int)(new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur)
75		return(ENOMEM);
76	old = round_page(old + ctob(vm->vm_dsize));
77	diff = new - old;
78	if (diff > 0) {
79		if (swap_pager_full) {
80			return(ENOMEM);
81		}
82		rv = vm_allocate(&vm->vm_map, &old, diff, FALSE);
83		if (rv != KERN_SUCCESS) {
84			return(ENOMEM);
85		}
86		vm->vm_dsize += btoc(diff);
87	} else if (diff < 0) {
88		diff = -diff;
89		rv = vm_deallocate(&vm->vm_map, new, diff);
90		if (rv != KERN_SUCCESS) {
91			return(ENOMEM);
92		}
93		vm->vm_dsize -= btoc(diff);
94	}
95	return(0);
96}
97
98struct ovadvise_args {
99	int	anom;
100};
101
102/* ARGSUSED */
103int
104ovadvise(p, uap, retval)
105	struct proc *p;
106	struct ovadvise_args *uap;
107	int *retval;
108{
109
110	return (EINVAL);
111}
112