1/*
2 * Copyright (c) 2013 Hudson River Trading LLC
3 * Written by: John H. Baldwin <jhb@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/types.h>
29#include <sys/sysctl.h>
30#include <sys/user.h>
31#include <stdlib.h>
32#include <string.h>
33
34#include "libutil.h"
35
36static struct kinfo_vmobject *
37kinfo_getvmobject_impl(int *cntp, const char *vmobjsysctl)
38{
39	char *buf, *bp, *ep;
40	struct kinfo_vmobject *kvo, *list, *kp;
41	size_t len;
42	int cnt, i;
43
44	buf = NULL;
45	for (i = 0; i < 3; i++) {
46		if (sysctlbyname(vmobjsysctl, NULL, &len, NULL, 0) < 0) {
47			free(buf);
48			return (NULL);
49		}
50		buf = reallocf(buf, len);
51		if (buf == NULL)
52			return (NULL);
53		if (sysctlbyname(vmobjsysctl, buf, &len, NULL, 0) == 0)
54			goto unpack;
55		if (errno != ENOMEM) {
56			free(buf);
57			return (NULL);
58		}
59	}
60	free(buf);
61	return (NULL);
62
63unpack:
64	/* Count items */
65	cnt = 0;
66	bp = buf;
67	ep = buf + len;
68	while (bp < ep) {
69		kvo = (struct kinfo_vmobject *)(uintptr_t)bp;
70		bp += kvo->kvo_structsize;
71		cnt++;
72	}
73
74	list = calloc(cnt, sizeof(*list));
75	if (list == NULL) {
76		free(buf);
77		return (NULL);
78	}
79
80	/* Unpack */
81	bp = buf;
82	kp = list;
83	while (bp < ep) {
84		kvo = (struct kinfo_vmobject *)(uintptr_t)bp;
85		memcpy(kp, kvo, kvo->kvo_structsize);
86		bp += kvo->kvo_structsize;
87		kp->kvo_structsize = sizeof(*kp);
88		kp++;
89	}
90	free(buf);
91	*cntp = cnt;
92	return (list);
93}
94
95struct kinfo_vmobject *
96kinfo_getvmobject(int *cntp)
97{
98	return (kinfo_getvmobject_impl(cntp, "vm.objects"));
99}
100
101struct kinfo_vmobject *
102kinfo_getswapvmobject(int *cntp)
103{
104	return (kinfo_getvmobject_impl(cntp, "vm.swap_objects"));
105}
106