FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_unix.c
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 * $FreeBSD: src/sys/vm/vm_unix.c,v 1.11.2.1 1999/09/05 08:24:42 peter Exp $
42 */
43
44 /*
45 * Traditional sbrk/grow interface to VM
46 */
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/sysproto.h>
50 #include <sys/proc.h>
51 #include <sys/resourcevar.h>
52
53 #include <vm/vm.h>
54 #include <vm/vm_param.h>
55 #include <vm/lock.h>
56 #include <vm/pmap.h>
57 #include <vm/vm_map.h>
58 #include <vm/swap_pager.h>
59 #include <vm/vm_prot.h>
60
61 #ifndef _SYS_SYSPROTO_H_
62 struct obreak_args {
63 char *nsize;
64 };
65 #endif
66
67 /* ARGSUSED */
68 int
69 obreak(p, uap, retval)
70 struct proc *p;
71 struct obreak_args *uap;
72 int *retval;
73 {
74 register struct vmspace *vm = p->p_vmspace;
75 vm_offset_t new, old, base;
76 int rv;
77
78 base = round_page((vm_offset_t) vm->vm_daddr);
79 new = round_page(uap->nsize);
80 if (new > base) {
81 if ((new - base) > (unsigned) p->p_rlimit[RLIMIT_DATA].rlim_cur)
82 return ENOMEM;
83 if (new >= VM_MAXUSER_ADDRESS)
84 return (ENOMEM);
85 } else if (new < base) {
86 /*
87 * This is simply an invalid value. If someone wants to
88 * do fancy address space manipulations, mmap and munmap
89 * can do most of what the user would want.
90 */
91 return EINVAL;
92 }
93
94 old = base + ctob(vm->vm_dsize);
95
96 if (new > old) {
97 vm_size_t diff;
98 if (swap_pager_full) {
99 return (ENOMEM);
100 }
101 diff = new - old;
102 rv = vm_map_find(&vm->vm_map, NULL, 0, &old, diff, FALSE,
103 VM_PROT_ALL, VM_PROT_ALL, 0);
104 if (rv != KERN_SUCCESS) {
105 return (ENOMEM);
106 }
107 vm->vm_dsize += btoc(diff);
108 } else if (new < old) {
109 rv = vm_map_remove(&vm->vm_map, new, old);
110 if (rv != KERN_SUCCESS) {
111 return (ENOMEM);
112 }
113 vm->vm_dsize -= btoc(old - new);
114 }
115 return (0);
116 }
117
118 #ifndef _SYS_SYSPROTO_H_
119 struct ovadvise_args {
120 int anom;
121 };
122 #endif
123
124 /* ARGSUSED */
125 int
126 ovadvise(p, uap, retval)
127 struct proc *p;
128 struct ovadvise_args *uap;
129 int *retval;
130 {
131
132 return (EINVAL);
133 }
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