Sync with HEAD.
[dragonfly.git] / sys / vm / vm_unix.c
blob2cd084a8135c448d8039f933a28a13ae7e2f5262
1 /*
2 * Copyright (c) 1988 University of Utah.
3 * Copyright (c) 1991, 1993
4 * The Regents of the University of California. All rights reserved.
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.
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.
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.
38 * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
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 $
42 * $DragonFly: src/sys/vm/vm_unix.c,v 1.7 2006/11/07 17:51:24 dillon Exp $
46 * Traditional sbrk/grow interface to VM
48 #include <sys/param.h>
49 #include <sys/sysproto.h>
50 #include <sys/proc.h>
51 #include <sys/resourcevar.h>
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>
60 * obreak_args(char *nsize)
62 /* ARGSUSED */
63 int
64 sys_obreak(struct obreak_args *uap)
66 struct proc *p = curproc;
67 struct vmspace *vm = p->p_vmspace;
68 vm_offset_t new, old, base;
69 int rv;
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) {
76 * We check resource limits here, but alow processes to
77 * reduce their usage, even if they remain over the limit.
79 if (new > old &&
80 (new - base) > (unsigned) p->p_rlimit[RLIMIT_DATA].rlim_cur)
81 return ENOMEM;
82 if (new >= VM_MAX_USER_ADDRESS)
83 return (ENOMEM);
84 } else if (new < base) {
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.
90 return EINVAL;
93 if (new > old) {
94 vm_size_t diff;
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,
100 &old, diff,
101 FALSE,
102 VM_MAPTYPE_NORMAL,
103 VM_PROT_ALL, VM_PROT_ALL,
105 if (rv != KERN_SUCCESS) {
106 return (ENOMEM);
108 vm->vm_dsize += btoc(diff);
109 } else if (new < old) {
110 rv = vm_map_remove(&vm->vm_map, new, old);
111 if (rv != KERN_SUCCESS) {
112 return (ENOMEM);
114 vm->vm_dsize -= btoc(old - new);
116 return (0);