vm_unix.c revision 1549 
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 */
42
43/*
44 * Traditional sbrk/grow interface to VM
45 */
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/proc.h>
49#include <sys/resourcevar.h>
50
51#include <vm/vm.h>
52
53extern int swap_pager_full;
54
55struct obreak_args {
56	char	*nsiz;
57};
58
59/* ARGSUSED */
60int
61obreak(p, uap, retval)
62	struct proc *p;
63	struct obreak_args *uap;
64	int *retval;
65{
66	register struct vmspace *vm = p->p_vmspace;
67	vm_offset_t new, old;
68	int rv;
69	register int diff;
70
71	old = (vm_offset_t)vm->vm_daddr;
72	new = round_page(uap->nsiz);
73	if ((int)(new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur)
74		return(ENOMEM);
75	old = round_page(old + ctob(vm->vm_dsize));
76	diff = new - old;
77	if (diff > 0) {
78		if (swap_pager_full) {
79			return(ENOMEM);
80		}
81		rv = vm_allocate(&vm->vm_map, &old, diff, FALSE);
82		if (rv != KERN_SUCCESS) {
83			return(ENOMEM);
84		}
85		vm->vm_dsize += btoc(diff);
86	} else if (diff < 0) {
87		diff = -diff;
88		rv = vm_deallocate(&vm->vm_map, new, diff);
89		if (rv != KERN_SUCCESS) {
90			return(ENOMEM);
91		}
92		vm->vm_dsize -= btoc(diff);
93	}
94	return(0);
95}
96
97struct ovadvise_args {
98	int	anom;
99};
100
101/* ARGSUSED */
102int
103ovadvise(p, uap, retval)
104	struct proc *p;
105	struct ovadvise_args *uap;
106	int *retval;
107{
108
109	return (EINVAL);
110}
111