kinfo_getvmobject.c revision 288453 
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/cdefs.h>
29__FBSDID("$FreeBSD: stable/10/lib/libutil/kinfo_getvmobject.c 288453 2015-10-01 17:09:20Z jhb $");
30
31#include <sys/types.h>
32#include <sys/sysctl.h>
33#include <sys/user.h>
34#include <stdlib.h>
35#include <string.h>
36
37#include "libutil.h"
38
39struct kinfo_vmobject *
40kinfo_getvmobject(int *cntp)
41{
42	char *buf, *bp, *ep;
43	struct kinfo_vmobject *kvo, *list, *kp;
44	size_t len;
45	int cnt, i;
46
47	buf = NULL;
48	for (i = 0; i < 3; i++) {
49		if (sysctlbyname("vm.objects", NULL, &len, NULL, 0) < 0)
50			return (NULL);
51		buf = reallocf(buf, len);
52		if (buf == NULL)
53			return (NULL);
54		if (sysctlbyname("vm.objects", buf, &len, NULL, 0) == 0)
55			goto unpack;
56		if (errno != ENOMEM) {
57			free(buf);
58			return (NULL);
59		}
60	}
61	free(buf);
62	return (NULL);
63
64unpack:
65	/* Count items */
66	cnt = 0;
67	bp = buf;
68	ep = buf + len;
69	while (bp < ep) {
70		kvo = (struct kinfo_vmobject *)(uintptr_t)bp;
71		bp += kvo->kvo_structsize;
72		cnt++;
73	}
74
75	list = calloc(cnt, sizeof(*list));
76	if (list == NULL) {
77		free(buf);
78		return (NULL);
79	}
80
81	/* Unpack */
82	bp = buf;
83	kp = list;
84	while (bp < ep) {
85		kvo = (struct kinfo_vmobject *)(uintptr_t)bp;
86		memcpy(kp, kvo, kvo->kvo_structsize);
87		bp += kvo->kvo_structsize;
88		kp->kvo_structsize = sizeof(*kp);
89		kp++;
90	}
91	free(buf);
92	*cntp = cnt;
93	return (list);
94}
95