Modify kern/makesyscall.sh to prefix all kernel system call procedures
[dragonfly.git] / sys / vm / vm_unix.c
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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 1.24.2.2 2002/07/02 20:06:19 dillon Exp $
753fd850 42 * $DragonFly: src/sys/vm/vm_unix.c,v 1.5 2006/06/05 07:26:11 dillon Exp $
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43 */
44
45/*
46 * Traditional sbrk/grow interface to VM
47 */
48#include <sys/param.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 <sys/lock.h>
56#include <vm/pmap.h>
57#include <vm/vm_map.h>
58
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59/*
60 * obreak_args(char *nsize)
61 */
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62/* ARGSUSED */
63int
753fd850 64sys_obreak(struct obreak_args *uap)
984263bc 65{
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66 struct proc *p = curproc;
67 struct vmspace *vm = p->p_vmspace;
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68 vm_offset_t new, old, base;
69 int rv;
70
71 base = round_page((vm_offset_t) vm->vm_daddr);
72 new = round_page((vm_offset_t)uap->nsize);
73 old = base + ctob(vm->vm_dsize);
74 if (new > base) {
75 /*
76 * We check resource limits here, but alow processes to
77 * reduce their usage, even if they remain over the limit.
78 */
79 if (new > old &&
80 (new - base) > (unsigned) p->p_rlimit[RLIMIT_DATA].rlim_cur)
81 return ENOMEM;
82 if (new >= VM_MAXUSER_ADDRESS)
83 return (ENOMEM);
84 } else if (new < base) {
85 /*
86 * This is simply an invalid value. If someone wants to
87 * do fancy address space manipulations, mmap and munmap
88 * can do most of what the user would want.
89 */
90 return EINVAL;
91 }
92
93 if (new > old) {
94 vm_size_t diff;
95
96 diff = new - old;
97 if (vm->vm_map.size + diff > p->p_rlimit[RLIMIT_VMEM].rlim_cur)
98 return(ENOMEM);
99 rv = vm_map_find(&vm->vm_map, NULL, 0, &old, diff, FALSE,
100 VM_PROT_ALL, VM_PROT_ALL, 0);
101 if (rv != KERN_SUCCESS) {
102 return (ENOMEM);
103 }
104 vm->vm_dsize += btoc(diff);
105 } else if (new < old) {
106 rv = vm_map_remove(&vm->vm_map, new, old);
107 if (rv != KERN_SUCCESS) {
108 return (ENOMEM);
109 }
110 vm->vm_dsize -= btoc(old - new);
111 }
112 return (0);
113}